Distributed entanglement generation between continuous-mode Gaussian fields with measurement-feedback enhancement

Hendra I. Nurdin, Naoki Yamamoto

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This paper studies a scheme of two spatially distant oscillator systems that are connected by Gaussian fields and examines distributed entanglement generation between two continuous-mode output Gaussian fields that are radiated by the oscillators. It is demonstrated that using measurement-feedback control while a nonlocal effective entangling operation is on can help to enhance the Einstein-Podolski-Rosen-like entanglement between the output fields. The effect of propagation delays and losses in the fields interconnecting the two oscillators and the effect of other losses in the system are also considered. In particular, for a range of time delays the measurement-feedback controller is able to maintain stability of the closed-loop system and the entanglement enhancement, but the achievable enhancement is only over a smaller bandwidth that is commensurate with the length of the time delays.

Original languageEnglish
Article number022337
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume86
Issue number2
DOIs
Publication statusPublished - 2012 Aug 29

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oscillators
feedback control
augmentation
time lag
output
controllers
bandwidth
propagation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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AB - This paper studies a scheme of two spatially distant oscillator systems that are connected by Gaussian fields and examines distributed entanglement generation between two continuous-mode output Gaussian fields that are radiated by the oscillators. It is demonstrated that using measurement-feedback control while a nonlocal effective entangling operation is on can help to enhance the Einstein-Podolski-Rosen-like entanglement between the output fields. The effect of propagation delays and losses in the fields interconnecting the two oscillators and the effect of other losses in the system are also considered. In particular, for a range of time delays the measurement-feedback controller is able to maintain stability of the closed-loop system and the entanglement enhancement, but the achievable enhancement is only over a smaller bandwidth that is commensurate with the length of the time delays.

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