l**********n
发帖数: 72 | 1 Here are some articles talking about quantum information transfer and
processing.
"Teleporting an unknown quantum state via dual classical and
Einstein-Podolsky-Rosen channels", C. H. Bennett et al, Phys. Rev. Lett. 70,
1895-1899 (1993)
"Long Distance, Unconditional Teleportation of Atomic States via Complete Bell
State Measurements", S. Lloyd et al, Phys. Rev. Lett. 87, 167903 (2001)
If you type in "Quantum information" in PROLA, this is typically what you can
get
Showing results 1 through 10 | l**********n
发帖数: 72 | 2 Hi, fisherdad:
For the moment, we don't know anything about how far the particles would lose
their coherence intrinsically, isn't that true? I guess for the current
technology, the probing distance is around 1 cm at most.
Second, I am not smart enough to propose a realistic way of quantum
information transfer, but according to the basic principle of quantum
mechanics, there is NO distance limit for the quantum coherence of the
particles. What I am saying is that if there is no decoherence due to | f*******d
发帖数: 339 | 3
关键就是这个波包收缩不能用来传递信息。 假定你自己对电子A做了一次测量， 现在你知道
另一个电子发生了波包收缩， 但是如果你不告诉我这一点，我单凭对手头这个电子B
进行测量是不可能知道你是否对电子A进行过测量的， 因为我只能测一次。
也许你会说， 对单个电子测量不足以传递信息， 但对多个电子测量可以。实际上这也是
不可能的， 因为你没法控制你自己的测量结果， 所以你无法把待传递的信息加载进去。
你所说的只和一种自旋态相互作用的仪器是不存在的， 因为这违背了相互做用的转动不变性。
【在 l**********n 的大作中提到】
: Hi, fisherdad:
: For the moment, we don't know anything about how far the particles would lose
: their coherence intrinsically, isn't that true? I guess for the current
: technology, the probing distance is around 1 cm at most.
: Second, I am not smart enough to propose a realistic way of quantum
: information transfer, but according to the basic principle of quantum
: mechanics, there is NO distance limit for the quantum coherence of the
: particles. What I am saying is that if there is no decoherence due to
| f*******d
发帖数: 339 | 4 我的基本看法是， 量子效应在通讯中可能有一些应用， 但是非局域信息传递是永远不可能
实现的， 除非将来推翻了相对论。
【在 l**********n 的大作中提到】
: Hi, fisherdad:
: For the moment, we don't know anything about how far the particles would lose
: their coherence intrinsically, isn't that true? I guess for the current
: technology, the probing distance is around 1 cm at most.
: Second, I am not smart enough to propose a realistic way of quantum
: information transfer, but according to the basic principle of quantum
: mechanics, there is NO distance limit for the quantum coherence of the
: particles. What I am saying is that if there is no decoherence due to
| l**********n
发帖数: 72 | 5 Currently the quantum coherence thing is still a mistery and it's good to do
some experiments to check the foundation of the quantum mechanics. Besides, I
think whatever they name it, quantum computer or quantum communication is just
a fad, but it's easy to get research fund and not a bad research topic in
terms of fundamental physics. For example, although you could avoid all the
deherence effects, I doubt the quantum states would collapse suddenly at the
same time when they are far apart( I do
【在 f*******d 的大作中提到】
: 我的基本看法是， 量子效应在通讯中可能有一些应用， 但是非局域信息传递是永远不可能
: 实现的， 除非将来推翻了相对论。
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