Feedback control of entanglement in a linear quantum network: A case study

Naoki Yamamoto; Hendra I. Nurdin; Matthew R. Jamest; Ian R. Petersen

doi:10.1109/CDC.2008.4739032

Feedback control of entanglement in a linear quantum network: A case study

Naoki Yamamoto, Hendra I. Nurdin, Matthew R. Jamest, Ian R. Petersen

Department of Applied Physics and Physico-Informatics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In this paper, we consider a linear quantum network composed of two distantly separated cavities that are connected via a one-way optical field. When one of the cavity is damped and the other is undamped, the overall cavity state obtains a large amount of entanglement in its quadratures. This entanglement however immediately decays and vanishes in a finite time. That is, entanglement sudden-death occurs. We show that the proportional measurement feedback method proposed by Wiseman can avoid this entanglement suddendeath, and further, enhance the entanglement. It is also shown that the entangled state under feedback control is robust against signal loss in a realistic detector, indicating the reliability of the proposed proportional feedback method in practical situations.

Original language	English
Title of host publication	Proceedings of the 47th IEEE Conference on Decision and Control, CDC 2008
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	4528-4533
Number of pages	6
ISBN (Print)	9781424431243
DOIs	https://doi.org/10.1109/CDC.2008.4739032
Publication status	Published - 2008
Event	47th IEEE Conference on Decision and Control, CDC 2008 - Cancun, Mexico Duration: 2008 Dec 9 → 2008 Dec 11

Publication series

Name	Proceedings of the IEEE Conference on Decision and Control
ISSN (Print)	0743-1546
ISSN (Electronic)	2576-2370

Other

Other	47th IEEE Conference on Decision and Control, CDC 2008
Country/Territory	Mexico
City	Cancun
Period	08/12/9 → 08/12/11

ASJC Scopus subject areas

Control and Systems Engineering
Modelling and Simulation
Control and Optimization

Access to Document

10.1109/CDC.2008.4739032

Cite this

Yamamoto, N., Nurdin, H. I., Jamest, M. R., & Petersen, I. R. (2008). Feedback control of entanglement in a linear quantum network: A case study. In Proceedings of the 47th IEEE Conference on Decision and Control, CDC 2008 (pp. 4528-4533). Article 4739032 (Proceedings of the IEEE Conference on Decision and Control). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CDC.2008.4739032

Feedback control of entanglement in a linear quantum network: A case study. / Yamamoto, Naoki; Nurdin, Hendra I.; Jamest, Matthew R. et al.
Proceedings of the 47th IEEE Conference on Decision and Control, CDC 2008. Institute of Electrical and Electronics Engineers Inc., 2008. p. 4528-4533 4739032 (Proceedings of the IEEE Conference on Decision and Control).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Yamamoto, N, Nurdin, HI, Jamest, MR & Petersen, IR 2008, Feedback control of entanglement in a linear quantum network: A case study. in Proceedings of the 47th IEEE Conference on Decision and Control, CDC 2008., 4739032, Proceedings of the IEEE Conference on Decision and Control, Institute of Electrical and Electronics Engineers Inc., pp. 4528-4533, 47th IEEE Conference on Decision and Control, CDC 2008, Cancun, Mexico, 08/12/9. https://doi.org/10.1109/CDC.2008.4739032

Yamamoto N, Nurdin HI, Jamest MR, Petersen IR. Feedback control of entanglement in a linear quantum network: A case study. In Proceedings of the 47th IEEE Conference on Decision and Control, CDC 2008. Institute of Electrical and Electronics Engineers Inc. 2008. p. 4528-4533. 4739032. (Proceedings of the IEEE Conference on Decision and Control). doi: 10.1109/CDC.2008.4739032

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AB - In this paper, we consider a linear quantum network composed of two distantly separated cavities that are connected via a one-way optical field. When one of the cavity is damped and the other is undamped, the overall cavity state obtains a large amount of entanglement in its quadratures. This entanglement however immediately decays and vanishes in a finite time. That is, entanglement sudden-death occurs. We show that the proportional measurement feedback method proposed by Wiseman can avoid this entanglement suddendeath, and further, enhance the entanglement. It is also shown that the entangled state under feedback control is robust against signal loss in a realistic detector, indicating the reliability of the proposed proportional feedback method in practical situations.

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Feedback control of entanglement in a linear quantum network: A case study

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