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OSA Workshop on Entanglement and Quantum Decoherence

Manipulation of photon-atom momentum entanglement

Hong Mei Guo, Rui Guo

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We propose some schemes to coherently enhance atom-photon momentum entanglement with either resonant photon scattering or spontaneously induced quantum interference. A novel feature called “phase entanglement” is reported, for which the traditional R-ratio-based entanglement detection becomes inadequate due to the quantum interference.

DOI
10.1364/weqd.2008.aps1

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We propose some schemes to coherently enhance atom-photon momentum entanglement with either resonant photon scattering or spontaneously induced quantum interference. A novel feature called “phase entanglement” is reported, for which the traditional R-ratio-based entanglement detection becomes inadequate due to the quantum interference.
Joint atom-photon states can become nonseparably entangled by momentum conservation in scattering events. The consequences are open for observation in interference experiments in which one particle is used to monitor the evolution of the other. We have previously quantified the degree of available recoil entanglement in spontaneous emission, and present here the extensions to Rayleigh scattering and Raman scattering, with an emphasis on the similarity among the three cases. It is found that such scattering processes have the potential to create a higher degree of entanglement between the scattered photon and the recoiled atom than any reported to date.
A scheme for entangling distant atoms is realized, as proposed in the seminal paper by [C. Cabrillo et al., Phys. Rev. A 59, 1025 (1999)]. The protocol is based on quantum interference and detection of a single photon scattered from two effectively one meter distant laser cooled and trapped atomic ions. The detection of a single photon heralds entanglement of two internal states of the trapped ions with high rate and with a fidelity limited mostly by atomic motion. Control of the entangled state phase is demonstrated by changing the path length of the single-photon interferometer.
The mechanism of pairwise scattering of photons with cold atoms is investigated. We show that considerable motional correlation can be established between atoms during the scattering process, which can effectively squeeze the scattering spectrum and can be utilized to produce highly entangled atomic wave packet. Under certain conditions, the atomic momentum entanglement can be efficiently enhanced beyond the 1 entanglement bit limit (known as 1ebit1\phantom{\rule{0.3em}{0ex}}\mathrm{ebit}1ebit, e.g., a Bell singlet state) with only single-photon scattering and detection.