Superposed coherent states improve fidelity of NOON states generated in post-selection

2014/01/30 by S. Sivakumar
Computer Science · Physics and Astronomy · #Beam (structure) #Beam splitter #Coherent states #Fidelity #Mixing (physics) #Noon #Orbital Angular Momentum in Optics #Quantum Information and Cryptography #Quantum optics and atomic interactions #State (computer science) #quant-ph

paper · pdf · doi:10.1139/cjp-2014-0030

arxiv created 2014/01/30 · openalex publication_date 2014/08/28 · arxiv updated 2015/06/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Mixing the squeezed vacuum and coherent state in a beam splitter generates NOON states of the electromagnetic field, but with fidelity less than unity. In this article it is shown that the output of the beam splitter generates the NOON states with unit fidelity if superposed coherent states are used instead of the squeezed vacuum. Also, the post-selection probability of NOON states is shown to be higher.

Citations

• Generation of Large-Amplitude Coherent-State Superposition via Ancilla-Assisted Photon Subtraction
• Sub-shot-noise quantum metrology with entangled identical particles
• Interferometric detection of optical phase shifts at the Heisenberg limit
• High-photon-number path entanglement in the interference of spontaneously down-converted photon pairs with coherent laser light