Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection

Details Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection

2005-10-31

arxiv.org/abs/quant-ph/0510235v2

Phys. Rev. A 73, 042304 (2006)

Physics

Quantum Physics

8 pages, 10 figures

Scientific paper

10.1103/PhysRevA.73.042304

We present a simple protocol to purify a coherent-state superposition that has undergone a linear lossy channel. The scheme constitutes only a single beam splitter and a homodyne detector, and thus is experimentally feasible. In practice, a superposition of coherent states is transformed into a classical mixture of coherent states by linear loss, which is usually the dominant decoherence mechanism in optical systems. We also address the possibility of producing a larger amplitude superposition state from decohered states, and show that in most cases the decoherence of the states are amplified along with the amplitude.

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