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Quantum phase transition of polaritonic excitations in a multi-excitation coupled array

Quantum phase transition of polaritonic excitations in a multi-excitation coupled array
Quantum phase transition of polaritonic excitations in a multi-excitation coupled array
We analyze the quantum phase transition-like behavior in the lowest energy state of a two-site coupled atom-cavity system, where each cavity contains one atom but the total excitation number is not limited to two. Under the large-detuning condition, we identify an interesting coexisting phase involving characteristics of both photonic superfluid and atomic insulator, which has not been previously revealed. For small hopping, we find that the signature of the photonic superfluid state becomes more pronounced with the increase in total excitation number, and that the boundaries of the various phases shift with respect to the case of two excitations. In the limit of small atom-field interaction, the polaritonic superfluid region becomes broader as the total excitation number increases. We use alternative order parameters to characterize the nonclassical property in the lowest-energy state, and find that the entanglement of photons in the photonic superfluid state has an approximately quadratic-like dependence on the total excitation number within the large-detuning limits. The second-order cross-correlation function is demonstrated to become inversely proportional to the total excitation number in the large detuning limits.
0020-7748
3667-3689
Shen, Lituo
d31aacbd-07b9-4580-bff6-3b9aa154e962
Chen, Rongxin
08f4fdc2-6244-48e5-a642-cb9e2641531c
Wu, Huaizhi
eb7b7429-4049-40b4-875b-b6fdc93de7bb
Yang, Zhenbiao
ae665067-603c-48ba-9b9c-c1f10d61c951
Irish, E.K.
b78b8d7c-c747-4437-bb6f-189186713998
Zheng, Shibiao
0095213b-cd12-4b41-a3fc-9e38df19721b
Shen, Lituo
d31aacbd-07b9-4580-bff6-3b9aa154e962
Chen, Rongxin
08f4fdc2-6244-48e5-a642-cb9e2641531c
Wu, Huaizhi
eb7b7429-4049-40b4-875b-b6fdc93de7bb
Yang, Zhenbiao
ae665067-603c-48ba-9b9c-c1f10d61c951
Irish, E.K.
b78b8d7c-c747-4437-bb6f-189186713998
Zheng, Shibiao
0095213b-cd12-4b41-a3fc-9e38df19721b

Shen, Lituo, Chen, Rongxin, Wu, Huaizhi, Yang, Zhenbiao, Irish, E.K. and Zheng, Shibiao (2017) Quantum phase transition of polaritonic excitations in a multi-excitation coupled array. International Journal of Theoretical Physics, 56 (11), 3667-3689. (doi:10.1007/s10773-017-3532-2).

Record type: Article

Abstract

We analyze the quantum phase transition-like behavior in the lowest energy state of a two-site coupled atom-cavity system, where each cavity contains one atom but the total excitation number is not limited to two. Under the large-detuning condition, we identify an interesting coexisting phase involving characteristics of both photonic superfluid and atomic insulator, which has not been previously revealed. For small hopping, we find that the signature of the photonic superfluid state becomes more pronounced with the increase in total excitation number, and that the boundaries of the various phases shift with respect to the case of two excitations. In the limit of small atom-field interaction, the polaritonic superfluid region becomes broader as the total excitation number increases. We use alternative order parameters to characterize the nonclassical property in the lowest-energy state, and find that the entanglement of photons in the photonic superfluid state has an approximately quadratic-like dependence on the total excitation number within the large-detuning limits. The second-order cross-correlation function is demonstrated to become inversely proportional to the total excitation number in the large detuning limits.

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Quantum phase transition of polaritonic excitations in a multi-excitation coupled array - Accepted Manuscript
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Accepted/In Press date: 11 September 2017
e-pub ahead of print date: 23 September 2017
Published date: November 2017

Identifiers

Local EPrints ID: 415079
URI: http://eprints.soton.ac.uk/id/eprint/415079
ISSN: 0020-7748
PURE UUID: 56cd8a6c-0886-4cac-9d3d-5cb4b6f548db

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Date deposited: 25 Oct 2017 16:30
Last modified: 22 Nov 2021 05:50

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Contributors

Author: Lituo Shen
Author: Rongxin Chen
Author: Huaizhi Wu
Author: Zhenbiao Yang
Author: E.K. Irish
Author: Shibiao Zheng

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