Physics – Quantum Physics
Scientific paper
2003-12-31
Phys. Rev. A 70, 020101(R) (2004)
Physics
Quantum Physics
Some important new results added, to appear in Phys.Rev.A (Rapid Communication)
Scientific paper
10.1103/PhysRevA.70.020101
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 ($\alpha>2$) and high fidelity ($F>0.99$). 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.
Jeong Halyun
Kim Min-Soo
Lund Austin P.
Ralph Timothy C.
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