具有不可因式分解状态的内部自由度的量子比特载体
Qubit carriers with internal degrees of freedom in a non-factorable state
摘要：
我们已经研究了量子比特状态的转移质量如何取决于携带量子比特的粒子的内部状态的可重性。该传输是在没有任何直接相互作用的情况下实现的，仅通过光子的部分交换、对其中一个光子的测量以及有条件的前馈校正。看来，传输的质量只受不用于信息编码的不可访问的内部自由度的状态的可扩展性水平的影响。我们已经找到了一个直接可测量的参数量化这种水平的可测量性，并证明了它的实用性实验。
英文摘要：
We have studied how the quality of transfer of a qubit state depends on distinguishability of internal states of the particles carrying qubits. The transfer is implemented without any direct interaction, just by a partial exchange of photons, measurement on one of them, and conditional feed-forward correction. It appears that the quality of the transfer is only influenced by the level of distinguishability of the states of unaccessible internal degrees of freedom not used for information encoding. We have found a directly measurable parameter quantifying this level of distinguishability and proved it usefulness experimentally.
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