Limitations of practical multi-photon decoherence-free states

Details Limitations of practical multi-photon decoherence-free states Limitations of practical multi-photon decoherence-free states

2005-03-14

arxiv.org/abs/quant-ph/0503120v1

Phys. Rev. A 72, 012308 (2005)

Physics

Quantum Physics

6 pages, no figure

Scientific paper

10.1103/PhysRevA.72.012308

It is shown in this paper that decoherence-free subspace (DFS) of practical multi-photon polarization can not avoid the exponential decoherence even in the same extra-environment if the photons are frequency-anticorrelated. The reason lies in that the condition of collective decoherence is not satisfied in this case. As an example, the evolution of biphoton's decoherence-free state is given. Possible solution for feasible multi-photon's DFS state is also given.

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