超级军网向量子卫星通信又迈进了（巨大的）一步
来源：百度文库 编辑：超级军网 时间：2024/05/02 07:39:02
<br /><br />重大突破：传输距离接近100公里，海拔4000米湖面上做的实验：
http://www.forbes.com/sites/alex ... tons-over-60-miles/
不知有否中文报道。那位大侠劳神翻译一下。
5/11/2012 @ 11:58AM |11,706 views
Chinese Researchers Quantum Teleport Photons Over 60 Miles
Since 1997, researchers have been able to quantum teleport photons with a major record being set by researchers at the University of Science and Technology of China in Shanghai. In 2010, that team successfully teleported a photon over 16km. Now that same team has released new findings, in which they claim to have teleported photons nearly 100km, or over 60 miles.
Now, quantum teleportation isn’t quite the same thing as the teleportation in Star Trek. When researchers teleport a photon, they aren’t teleporting the actual photon, but rather the information contained in it through quantum entanglement. In essence, the second photon at the end of the teleport becomes the first one – or at least, it becomes an identical qubit of information. So the information is exchanged without actually travelling through the intervening distance.
(If that sounds bizarre and frightening, you’re in good company. Albert Einstein understatedly called the process of quantum entanglement “spooky action at a distance.”)
The challenge for quantum teleportation is that it has to be done in free space. Fiberoptics don’t work, because once you get to distances over about 1 kilometer, the fiber absorbs so much light that the information is lost. But while a fiberoptic cable can keep photons focused, moving over free space means using lasers – which inevitably causes the beam of light to spread out over time. However, using a powerful laser along with some other optical equipment, the researchers here developed a technique to keep the beam focused over the course of 97km, and successfully achieved quantum teleportation.
The ability to teleport information means that it could be possible to have worldwide communications that are impossible to listen in on. Because in quantum teleportation, the information doesn’t travel over any intervening distances, there’s no way to tap into the communication. As Technology Review notes, “these guys clearly have their eye on the possibility of satellite-based quantum cryptography which would provide ultra secure communications around the world.”
That technology is still a long way off, however. Despite the fact that the communication developed here is very efficient, it’s also very slow. They’ll also have to keep improving the distance. 60 miles for teleportation is a new record. It’s impressive. But communications satellites are typically in geosynchronous orbit – 22,236 miles up in the air.
Still, while there’s still a long way to go before we have true quantum-teleportation powered communications, this is a huge step in that direction.
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<br /><br />重大突破：传输距离接近100公里，海拔4000米湖面上做的实验：
http://www.forbes.com/sites/alex ... tons-over-60-miles/
不知有否中文报道。那位大侠劳神翻译一下。
5/11/2012 @ 11:58AM |11,706 views
Chinese Researchers Quantum Teleport Photons Over 60 Miles
Since 1997, researchers have been able to quantum teleport photons with a major record being set by researchers at the University of Science and Technology of China in Shanghai. In 2010, that team successfully teleported a photon over 16km. Now that same team has released new findings, in which they claim to have teleported photons nearly 100km, or over 60 miles.
Now, quantum teleportation isn’t quite the same thing as the teleportation in Star Trek. When researchers teleport a photon, they aren’t teleporting the actual photon, but rather the information contained in it through quantum entanglement. In essence, the second photon at the end of the teleport becomes the first one – or at least, it becomes an identical qubit of information. So the information is exchanged without actually travelling through the intervening distance.
(If that sounds bizarre and frightening, you’re in good company. Albert Einstein understatedly called the process of quantum entanglement “spooky action at a distance.”)
The challenge for quantum teleportation is that it has to be done in free space. Fiberoptics don’t work, because once you get to distances over about 1 kilometer, the fiber absorbs so much light that the information is lost. But while a fiberoptic cable can keep photons focused, moving over free space means using lasers – which inevitably causes the beam of light to spread out over time. However, using a powerful laser along with some other optical equipment, the researchers here developed a technique to keep the beam focused over the course of 97km, and successfully achieved quantum teleportation.
The ability to teleport information means that it could be possible to have worldwide communications that are impossible to listen in on. Because in quantum teleportation, the information doesn’t travel over any intervening distances, there’s no way to tap into the communication. As Technology Review notes, “these guys clearly have their eye on the possibility of satellite-based quantum cryptography which would provide ultra secure communications around the world.”
That technology is still a long way off, however. Despite the fact that the communication developed here is very efficient, it’s also very slow. They’ll also have to keep improving the distance. 60 miles for teleportation is a new record. It’s impressive. But communications satellites are typically in geosynchronous orbit – 22,236 miles up in the air.
Still, while there’s still a long way to go before we have true quantum-teleportation powered communications, this is a huge step in that direction.
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http://www.forbes.com/sites/alex ... tons-over-60-miles/
不知有否中文报道。那位大侠劳神翻译一下。
5/11/2012 @ 11:58AM |11,706 views
Chinese Researchers Quantum Teleport Photons Over 60 Miles
Since 1997, researchers have been able to quantum teleport photons with a major record being set by researchers at the University of Science and Technology of China in Shanghai. In 2010, that team successfully teleported a photon over 16km. Now that same team has released new findings, in which they claim to have teleported photons nearly 100km, or over 60 miles.
Now, quantum teleportation isn’t quite the same thing as the teleportation in Star Trek. When researchers teleport a photon, they aren’t teleporting the actual photon, but rather the information contained in it through quantum entanglement. In essence, the second photon at the end of the teleport becomes the first one – or at least, it becomes an identical qubit of information. So the information is exchanged without actually travelling through the intervening distance.
(If that sounds bizarre and frightening, you’re in good company. Albert Einstein understatedly called the process of quantum entanglement “spooky action at a distance.”)
The challenge for quantum teleportation is that it has to be done in free space. Fiberoptics don’t work, because once you get to distances over about 1 kilometer, the fiber absorbs so much light that the information is lost. But while a fiberoptic cable can keep photons focused, moving over free space means using lasers – which inevitably causes the beam of light to spread out over time. However, using a powerful laser along with some other optical equipment, the researchers here developed a technique to keep the beam focused over the course of 97km, and successfully achieved quantum teleportation.
The ability to teleport information means that it could be possible to have worldwide communications that are impossible to listen in on. Because in quantum teleportation, the information doesn’t travel over any intervening distances, there’s no way to tap into the communication. As Technology Review notes, “these guys clearly have their eye on the possibility of satellite-based quantum cryptography which would provide ultra secure communications around the world.”
That technology is still a long way off, however. Despite the fact that the communication developed here is very efficient, it’s also very slow. They’ll also have to keep improving the distance. 60 miles for teleportation is a new record. It’s impressive. But communications satellites are typically in geosynchronous orbit – 22,236 miles up in the air.
Still, while there’s still a long way to go before we have true quantum-teleportation powered communications, this is a huge step in that direction.
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<br /><br />重大突破：传输距离接近100公里，海拔4000米湖面上做的实验：
http://www.forbes.com/sites/alex ... tons-over-60-miles/
不知有否中文报道。那位大侠劳神翻译一下。
5/11/2012 @ 11:58AM |11,706 views
Chinese Researchers Quantum Teleport Photons Over 60 Miles
Since 1997, researchers have been able to quantum teleport photons with a major record being set by researchers at the University of Science and Technology of China in Shanghai. In 2010, that team successfully teleported a photon over 16km. Now that same team has released new findings, in which they claim to have teleported photons nearly 100km, or over 60 miles.
Now, quantum teleportation isn’t quite the same thing as the teleportation in Star Trek. When researchers teleport a photon, they aren’t teleporting the actual photon, but rather the information contained in it through quantum entanglement. In essence, the second photon at the end of the teleport becomes the first one – or at least, it becomes an identical qubit of information. So the information is exchanged without actually travelling through the intervening distance.
(If that sounds bizarre and frightening, you’re in good company. Albert Einstein understatedly called the process of quantum entanglement “spooky action at a distance.”)
The challenge for quantum teleportation is that it has to be done in free space. Fiberoptics don’t work, because once you get to distances over about 1 kilometer, the fiber absorbs so much light that the information is lost. But while a fiberoptic cable can keep photons focused, moving over free space means using lasers – which inevitably causes the beam of light to spread out over time. However, using a powerful laser along with some other optical equipment, the researchers here developed a technique to keep the beam focused over the course of 97km, and successfully achieved quantum teleportation.
The ability to teleport information means that it could be possible to have worldwide communications that are impossible to listen in on. Because in quantum teleportation, the information doesn’t travel over any intervening distances, there’s no way to tap into the communication. As Technology Review notes, “these guys clearly have their eye on the possibility of satellite-based quantum cryptography which would provide ultra secure communications around the world.”
That technology is still a long way off, however. Despite the fact that the communication developed here is very efficient, it’s also very slow. They’ll also have to keep improving the distance. 60 miles for teleportation is a new record. It’s impressive. But communications satellites are typically in geosynchronous orbit – 22,236 miles up in the air.
Still, while there’s still a long way to go before we have true quantum-teleportation powered communications, this is a huge step in that direction.
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中国的研究人员自1997年以来，超过60英里的量子传送光子，研究人员已经能够在上海，在中国科学技术大学的研究人员正在设置一个主要纪录光子量子瞬移。在2010年，该小组成功地被传了16公里一个光子。现在，同样的团队已经发布了新的发现，他们声称，有近100公里，或超过60公里的远距传送光子。现在，量子态隐形传输是不太在星际旅行隐形传送同样的事情。当研究人员传送光子，它们不传送的实际光子，而是通过量子纠缠它包含的信息。在本质上，第二个光子在瞬移结束的成为第一个 - 或至少，它变成一个相同的比特的信息。因此，信息交换，实际上不通过干预距离行驶。 （如果这听起来有点怪异和可怕的，你是好公司。爱因斯坦understatedly称为量子纠缠的过程中，“在距离幽灵行动。”）的量子态隐形传输所面临的挑战是，它必须在自由空间。 fiberoptics不工作，因为一旦你获得了约1公里的距离，纤维吸收了大量光信息丢失。但同时光纤电缆可以让光子集中，超过自由空间，是指利用激光 - 这不可避免地导致光束传播时间的推移。然而，用强大的激光，连同其他一些光学仪器，这里的研究人员开发出一种技术，保持集中的光束以上的97公里过程中，成功地实现了量子态隐形传输。传送信息的能力，这意味着它可能是可能有，是不可能的，听的全球通信。因为在量子态隐形传输，信息不旅行过任何干预的距离，没有办法进军通信。随着技术的修改说明，“这些家伙显然有自己的眼睛上的卫星为基础的量子密码将提供世界各地的超安全通信的可能性。”技术仍然是很长的路要走，但是。尽管事实上，这里开发的沟通是非常有效的，它也很慢。他们也会有不断提高的距离。 60英里隐形传输是一个新的纪录。这是令人印象深刻。但通信卫星通常在地球同步轨道 - 空气中的22,236英里。尽管如此，还是有很长的路，去之前，我们有真正的量子态隐形传输的供电通信，这是朝着这个方向迈进了一大步。
{:soso_e113:}{:soso_e113:}
using a powerful laser along with some other optical equipment, the researchers here developed a technique to keep the beam focused over the course of 97km
这么强悍的“聚光”技术，在激光武器上也能获得应用吧？
using a powerful laser along with some other optical equipment, the researchers here developed a technique to keep the beam focused over the course of 97km
这么强悍的“聚光”技术，在激光武器上也能获得应用吧？
联系中科院计划2015年发射首颗量子通信卫星。。。。
另一篇报道
05/11/2012
Chinese Physicists Smash Distance Record （again）For Teleportation
http://www.technologyreview.com/blog/arxiv/27843/?ref=rss
The ability to teleport photons through 100 kilometres of free space opens the way for satellite-based quantum communications, say researchers
Teleportation is the extraordinary ability to transfer objects from one location to another without travelling through the intervening space.
The idea is not that the physical object is teleported but the information that describes it. This can then be applied to a similar object in a new location which effectively takes on the new identity.
And it is by no means science fiction. Physicists have been teleporting photons since 1997 and the technique is now standard in optics laboratories all over the world.
The phenomenon that makes this possible is known as quantum entanglement, the deep and mysterious link that occurs when two quantum objects share the same existence and yet are separated in space.
Teleportation turns out to be extremely useful. Because teleported information does not travel through the intervening space, it cannot be secretly accessed by an eavesdropper.
For that reason, teleportation is the enabling technology behind quantum cryptography, a way of sending information with close-to-perfect secrecy.
Unfortunately, entangled photons are fragile objects. They cannot travel further than a kilometre or so down optical fibres because the photons end up interacting with the glass breaking the entanglement. That severely limits quantum cryptography's usefulness.
However, physicists have had more success teleporting photons through the atmosphere. In 2010, a Chinese team announced that it had teleported single photons over a distance of 16 kilometres. Handy but not exactly Earth-shattering.
Now the same team says it has smashed this record. Juan Yin at the University of Science and Technology of China in Shanghai, and a bunch of mates say they have teleported entangled photons over a distance of 97 kilometres across a lake in China.
That's an impressive feat for several reasons. The trick these guys have perfected is to find a way to use a 1.3 Watt laser and some fancy optics to beam the light and receive it.
Inevitably photons get lost and entanglement is destroyed in such a process. Imperfections in the optics and air turbulence account for some of these losses but the biggest problem is beam widening (they did the experiment at an altitude of about 4000 metres). Since the beam spreads out as it travels, many of the photons simply miss the target altogether.
So the most important advance these guys have made is to develop a steering mechanism using a guide laser that keeps the beam precisely on target（this technology would surely find its use in laser weapons）. As a result, they were able to teleport more than 1100 photons in 4 hours over a distance of 97 kilometres.
That's interesting because it's the same channel attenuation that you'd have to cope with when beaming photons to a satellite with, say, 20 centimetre optics orbiting at about 500 kilometres. "The successful quantum teleportation over such channel losses in combination with our high-frequency and high-accuracy [aiming] technique show the feasibility of satellite-based ultra-long-distance quantum teleportation," say Juan and co.
So these guys clearly have their eye on the possibility of satellite-based quantum cryptography which would provide ultra secure communications around the world. That's in stark contrast to the few kilometres that are possible with commercial quantum cryptography gear.
Of course, data rates are likely to be slow and the rapidly emerging technology of quantum repeaters will extend the reach of ground-based quantum cryptography so that it could reach around the world, in principle at least.
But a perfect, satellite-based security system might be a useful piece of kit to have on the roof of an embassy or distributed among the armed forces.
Something for western security experts to think about.
Ref: arxiv.org/abs/1205.2024: Teleporting Independent Qubits Through A 97 Km Free-Space Channel
05/11/2012
Chinese Physicists Smash Distance Record （again）For Teleportation
http://www.technologyreview.com/blog/arxiv/27843/?ref=rss
The ability to teleport photons through 100 kilometres of free space opens the way for satellite-based quantum communications, say researchers
Teleportation is the extraordinary ability to transfer objects from one location to another without travelling through the intervening space.
The idea is not that the physical object is teleported but the information that describes it. This can then be applied to a similar object in a new location which effectively takes on the new identity.
And it is by no means science fiction. Physicists have been teleporting photons since 1997 and the technique is now standard in optics laboratories all over the world.
The phenomenon that makes this possible is known as quantum entanglement, the deep and mysterious link that occurs when two quantum objects share the same existence and yet are separated in space.
Teleportation turns out to be extremely useful. Because teleported information does not travel through the intervening space, it cannot be secretly accessed by an eavesdropper.
For that reason, teleportation is the enabling technology behind quantum cryptography, a way of sending information with close-to-perfect secrecy.
Unfortunately, entangled photons are fragile objects. They cannot travel further than a kilometre or so down optical fibres because the photons end up interacting with the glass breaking the entanglement. That severely limits quantum cryptography's usefulness.
However, physicists have had more success teleporting photons through the atmosphere. In 2010, a Chinese team announced that it had teleported single photons over a distance of 16 kilometres. Handy but not exactly Earth-shattering.
Now the same team says it has smashed this record. Juan Yin at the University of Science and Technology of China in Shanghai, and a bunch of mates say they have teleported entangled photons over a distance of 97 kilometres across a lake in China.
That's an impressive feat for several reasons. The trick these guys have perfected is to find a way to use a 1.3 Watt laser and some fancy optics to beam the light and receive it.
Inevitably photons get lost and entanglement is destroyed in such a process. Imperfections in the optics and air turbulence account for some of these losses but the biggest problem is beam widening (they did the experiment at an altitude of about 4000 metres). Since the beam spreads out as it travels, many of the photons simply miss the target altogether.
So the most important advance these guys have made is to develop a steering mechanism using a guide laser that keeps the beam precisely on target（this technology would surely find its use in laser weapons）. As a result, they were able to teleport more than 1100 photons in 4 hours over a distance of 97 kilometres.
That's interesting because it's the same channel attenuation that you'd have to cope with when beaming photons to a satellite with, say, 20 centimetre optics orbiting at about 500 kilometres. "The successful quantum teleportation over such channel losses in combination with our high-frequency and high-accuracy [aiming] technique show the feasibility of satellite-based ultra-long-distance quantum teleportation," say Juan and co.
So these guys clearly have their eye on the possibility of satellite-based quantum cryptography which would provide ultra secure communications around the world. That's in stark contrast to the few kilometres that are possible with commercial quantum cryptography gear.
Of course, data rates are likely to be slow and the rapidly emerging technology of quantum repeaters will extend the reach of ground-based quantum cryptography so that it could reach around the world, in principle at least.
But a perfect, satellite-based security system might be a useful piece of kit to have on the roof of an embassy or distributed among the armed forces.
Something for western security experts to think about.
Ref: arxiv.org/abs/1205.2024: Teleporting Independent Qubits Through A 97 Km Free-Space Channel
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该无所谓啊，根本不需要装在卫星上啊？
通讯卫星只是个信号中转站，传统通讯卫星都是有多少多少个啥波段转发器，量子通讯也需要中转？
别又是上海交大芯片科技那种故事吧？
那年水变油技术还上报纸宣传呢、
通讯卫星只是个信号中转站，传统通讯卫星都是有多少多少个啥波段转发器，量子通讯也需要中转？
别又是上海交大芯片科技那种故事吧？
那年水变油技术还上报纸宣传呢、
量子通讯只是美好的愿望，目前还在“读取”的水平，还不能“写入”信息。
我的这篇贴子对量子激光传输里中科大彭承志做了权威解释,现在科普人才太少了http://lt.cjdby.net/thread-1339825-3-1.html
我的这篇贴子对量子激光传输里中科大彭承志做了权威解释,现在科普人才太少了http://lt.cjdby.net/thread-1339825-3-1.html
国科环宇的自由激光通信2010年在青海湖还只有40公里,今年都超过100公里了,进步真快呀!http://lt.cjdby.net/thread-1339825-2-1.html
laopiaoke 发表于 2012-5-12 15:14 
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
这是你的理解错误，量子通信这个东西出来的时候经常有这种误解。
大概理解的话，这里使用的量子通信技术，只是用来加密。而不是作为传输手段。实际传输手段仍然光通信，量子技术只是使这个光通信加密且完全不可破解。
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
这是你的理解错误，量子通信这个东西出来的时候经常有这种误解。
大概理解的话，这里使用的量子通信技术，只是用来加密。而不是作为传输手段。实际传输手段仍然光通信，量子技术只是使这个光通信加密且完全不可破解。
离大规模应用还有一段距离。。。
laopiaoke 发表于 2012-5-12 15:14
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
不是你想象的那样。现在我们搞的这个量子通讯只是“经量子加密的光通讯”，信息仍然要使用光子通过光纤或者直接传输，比传统的光传输还要困难。正在攻克中。
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
不是你想象的那样。现在我们搞的这个量子通讯只是“经量子加密的光通讯”，信息仍然要使用光子通过光纤或者直接传输，比传统的光传输还要困难。正在攻克中。
瞬时的量子通道不能单独用,要配合光速通道才能传输有意义的信息
这个如能成功，算是中国引领世界新技术革命的第一项实用成果
做好保密工作，老美最重视技术也最喜欢偷技术！小心象当年的激光防护技术一样被偷走！
激动，中国自从活字印刷之后真的是好久没有在尖端科技上引领世界了{:soso__6403361677774041261_2:}
希望继续保持领先
离理想中的量子纠缠通讯还有十万八千里
还是出口转内销的消息
应该还是量子加密通讯，虽然离真正的量子通讯还十万八千里，但如果真的能实用，也非常牛逼了
科大从合肥跑到上海了？
hswz 发表于 2012-5-12 15:35
我的这篇贴子对量子激光传输里中科大彭承志做了权威解释,现在科普人才太少了http://lt.cjdby.net/thread-13 ...
谢谢传送~~~
我的这篇贴子对量子激光传输里中科大彭承志做了权威解释,现在科普人才太少了http://lt.cjdby.net/thread-13 ...
谢谢传送~~~
其实量子力学理论早在上个世纪就基本定型了，可目前在技术实现上走的还很近。
laopiaoke 发表于 2012-5-12 15:14
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
我认为上面几个楼的解释都是错误的～和我之前对量子纠缠的理解完全两码事～百度下量子纠缠，应该有所收获！
比如正电子和负电子碰撞变成两个光子，那么由于守恒定律，两光子的自旋加起来应该和两个电子一样！
这时候两个光子的自旋（量子态之一）就纠缠了～你用各种发式改变其中一个，另外一个突然诡异的就变化了！
这种变化无延迟，而且还是无视距离的，无视介质，但是前提是你要把这两个光子分开到需要通讯的两个地点～
实际上必须把这两个光子看成同一个量子，虽然远隔万里，其实是一个东西！这样子违反常识，但是好理解它们的属性～
无视距离：因为它们还必须当成一个量子，而不是两个～
无视延迟：因为同上
无视干扰：还是同上
无视介质：继续同上
laopiaoke 发表于 2012-5-12 15:14
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
我认为上面几个楼的解释都是错误的～和我之前对量子纠缠的理解完全两码事～百度下量子纠缠，应该有所收获！
比如正电子和负电子碰撞变成两个光子，那么由于守恒定律，两光子的自旋加起来应该和两个电子一样！
这时候两个光子的自旋（量子态之一）就纠缠了～你用各种发式改变其中一个，另外一个突然诡异的就变化了！
这种变化无延迟，而且还是无视距离的，无视介质，但是前提是你要把这两个光子分开到需要通讯的两个地点～
实际上必须把这两个光子看成同一个量子，虽然远隔万里，其实是一个东西！这样子违反常识，但是好理解它们的属性～
无视距离：因为它们还必须当成一个量子，而不是两个～
无视延迟：因为同上
无视干扰：还是同上
无视介质：继续同上
lxy1415926 发表于 2012-5-13 00:03
我认为上面几个楼的解释都是错误的～和我之前对量子纠缠的理解完全两码事～
百度下量子纠缠，应 ...
这两个光子能长时间存在吗？
不要过不了几分钟就没了，那还拿啥通信啊。。
我认为上面几个楼的解释都是错误的～和我之前对量子纠缠的理解完全两码事～
百度下量子纠缠，应 ...
这两个光子能长时间存在吗？
不要过不了几分钟就没了，那还拿啥通信啊。。
九鬼 发表于 2012-5-13 01:37
这两个光子能长时间存在吗？
不要过不了几分钟就没了，那还拿啥通信啊。。
这个木有想过～
但是只要光子不被吸收，理论上光子的能量是不可能凭空消失的啊～
就是不知道他们用了什么方式让光子不被吸收～
[屏蔽词]的百度下光子，全[屏蔽词]的都是嫩肤的·····
这两个光子能长时间存在吗？
不要过不了几分钟就没了，那还拿啥通信啊。。
这个木有想过～但是只要光子不被吸收，理论上光子的能量是不可能凭空消失的啊～
就是不知道他们用了什么方式让光子不被吸收～
[屏蔽词]的百度下光子，全[屏蔽词]的都是嫩肤的·····
lxy1415926 发表于 2012-5-13 00:03
我认为上面几个楼的解释都是错误的～和我之前对量子纠缠的理解完全两码事～
百度下量子纠缠，应 ...
理论上是这样的，但是实际上，处于纠缠态的光子一旦被测量，其纠缠态就会被破坏，也就是说你把两个纠缠态的光子分置两地，测量其中一个光子的状态，则这两个光子的纠缠态就会被打破，目前的量子通讯加密其实就是利用这种性质。
真正意义上的超光速量子通讯，还要等更先进的测量手段出现后才有可能出现。
我认为上面几个楼的解释都是错误的～和我之前对量子纠缠的理解完全两码事～
百度下量子纠缠，应 ...
理论上是这样的，但是实际上，处于纠缠态的光子一旦被测量，其纠缠态就会被破坏，也就是说你把两个纠缠态的光子分置两地，测量其中一个光子的状态，则这两个光子的纠缠态就会被打破，目前的量子通讯加密其实就是利用这种性质。
真正意义上的超光速量子通讯，还要等更先进的测量手段出现后才有可能出现。
理论上是这样的，但是实际上，处于纠缠态的光子一旦被测量，其纠缠态就会被破坏，也就是说你把两个纠缠态 ...
理论上是不行的 原因就是你说的不可测原理 除非理论本身被突破
理论上是不行的 原因就是你说的不可测原理 除非理论本身被突破
lxy1415926 发表于 2012-5-13 01:55
这个木有想过～
但是只要光子不被吸收，理论上光子的能量是不可能凭空消失的啊～
就是不知道他们 ...
二维展开蚀刻
这个木有想过～
但是只要光子不被吸收，理论上光子的能量是不可能凭空消失的啊～
就是不知道他们 ...
二维展开蚀刻
6280177@qq.com 发表于 2012-5-14 11:58
理论上是不行的 原因就是你说的不可测原理 除非理论本身被突破
理论上是可以的，只是现在测量手段的问题，测不准原理不影响量子的超光速通讯，测量扰动导致纠缠态被破坏才会影响。
理论上是不行的 原因就是你说的不可测原理 除非理论本身被突破
理论上是可以的，只是现在测量手段的问题，测不准原理不影响量子的超光速通讯，测量扰动导致纠缠态被破坏才会影响。
rank0001 发表于 2012-5-13 10:59
理论上是这样的，但是实际上，处于纠缠态的光子一旦被测量，其纠缠态就会被破坏，也就是说你把两个纠缠态 ...
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
理论上是这样的，但是实际上，处于纠缠态的光子一旦被测量，其纠缠态就会被破坏，也就是说你把两个纠缠态 ...
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
紫竹 发表于 2012-5-14 16:53
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
所以说是理论上嘛！实际上现在做不到，但将来未必做不到！
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
所以说是理论上嘛！实际上现在做不到，但将来未必做不到！
rank0001 发表于 2012-5-14 17:01
所以说是理论上嘛！实际上现在做不到，但将来未必做不到！
将来也做不到
所以说是理论上嘛！实际上现在做不到，但将来未必做不到！
将来也做不到
mcv 发表于 2012-5-14 23:54
将来也做不到
这可难说，100年前还没有相对论呢。
将来也做不到
这可难说，100年前还没有相对论呢。
紫竹 发表于 2012-5-14 16:53
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
正解 严密的说法就是 信息的传播速度不能超过光速
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
正解 严密的说法就是 信息的传播速度不能超过光速
紫竹 发表于 2012-5-14 16:53
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
“不带信息”不就是带了信息吗？带的信息是“本次未带信息”
超光速通信是办不到的，只能在不带信息的情况下达到超光速，一旦带了信息，只能在光速下。
“不带信息”不就是带了信息吗？带的信息是“本次未带信息”
laopiaoke 发表于 2012-5-12 15:14
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
没看懂楼主贴的么，需要发送载体光子。。
说白了还是需要类似光纤的约束，所以某些人ＹＹ的什么无视光速就是纯ＹＹ。
量子通信只是保密性强而已。
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
没看懂楼主贴的么，需要发送载体光子。。
说白了还是需要类似光纤的约束，所以某些人ＹＹ的什么无视光速就是纯ＹＹ。
量子通信只是保密性强而已。
laopiaoke 发表于 2012-5-12 15:14
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
"无延时，无视距离，无需介质，无视干扰" 这个理解是不对的，目前做的还远没有那么理想。
一直有个问题：量子通讯号称无延时，无视距离，无需介质，无视干扰。那收发的两台设备摆在地球哪个地方应该 ...
"无延时，无视距离，无需介质，无视干扰" 这个理解是不对的，目前做的还远没有那么理想。