Quantum Capacity of a dephasing channel with memory

Details Quantum Capacity of a dephasing channel with memory Quantum Capacity of a dephasing channel with memory

2007-03-02

arxiv.org/abs/quant-ph/0703014v3

New J. Phys. 9, 310 (2007)

Physics

Quantum Physics

Revised version, to be published in New Journal of Physics

Scientific paper

10.1088/1367-2630/9/9/310

We show that the amount of coherent quantum information that can be reliably transmitted down a dephasing channel with memory is maximized by separable input states. In particular, we model the channel as a Markov chain or a multimode environment of oscillators. While in the first model the maximization is achieved for the maximally mixed input state, in the latter it is convenient to exploit the presence of a decoherence-protected subspace generated by memory effects. We explicitly compute the quantum channel capacity for the first model while numerical simulations suggest a lower bound for the latter. In both cases memory effects enhance the coherent information. We present results valid for arbitrary size of the input.

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