Conditional Production of Superpositions of Coherent States with Inefficient Photon Detection
arXiv:quant-ph/0401001 · doi:10.1103/PhysRevA.70.020101
Abstract
It is shown that a linear superposition of two macroscopically distinguishable optical coherent states can be generated using a single photon source and simple all-optical operations. Weak squeezing on a single photon, beam mixing with an auxiliary coherent state, and photon detecting with imperfect threshold detectors are enough to generate a coherent state superposition in a free propagating optical field with a large coherent amplitude () and high fidelity (). In contrast to all previous schemes to generate such a state, our scheme does not need photon number resolving measurements nor Kerr-type nonlinear interactions. Furthermore, it is robust to detection inefficiency and exhibits some resilience to photon production inefficiency.
Some important new results added, to appear in Phys.Rev.A (Rapid Communication)
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