Quantum interference between a single-photon Fock state and a coherent state

OPTICS COMMUNICATIONS

卷:284

Article

Windhager, A.²  Suda, M.¹  Pacher, C.¹  Peev, M.¹  Poppe, A.¹ 

[1] AIT Austrian Inst Technol GmbH, Safety & Secur Dept, Opt Quantum Technol, A-1220 Vienna, Austria

[2] Vienna Univ Technol, Inst Atom, A-1020 Vienna, Austria

关键词: Coherent state;    Displaced Fock state;    Mach-Zehnder;    Entanglement;    Quantum interference;   

DOI  :  10.1016/j.optcom.2010.12.019

来源: Elsevier

【 摘 要 】

We derive analytical expressions for the single mode quantum field state at the individual output ports of a beam splitter when a single-photon Fock state and a coherent state are incident on the input ports. The output states turn out to be a statistical mixture between a displaced Fock state and a coherent state. Consequently we are able to find an analytical expression for the corresponding Wigner function. Because of the generality of our calculations the obtained results are valid for all passive and lossless optical four port devices. We show further how the results can be adapted to the case of the Mach-Zehnder interferometer. In addition we consider the case for which the single-photon Fock state is replaced with a general input state: a coherent input state displaces each general quantum state at the output port of a beam splitter with the displacement parameter being the amplitude of the coherent state. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free