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Yang W.L.,CAS Wuhan Institute of Physics and Mathematics | Yin Z.Q.,University of Chinese Academy of Sciences | Yin Z.Q.,Tsinghua University | Chen Q.,CAS Wuhan Institute of Physics and Mathematics | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We present a scheme to engineer a two-mode squeezed state of effective bosonic modes realized by collective excitations of two distant nitrogen-vacancy-center ensembles (NVEs) coupled to separated transmission line resonators (TLRs), which are interconnected by a current-biased Josephson-junction superconducting qubit. By making use of the engineered NVE-TLR magnetic coupling with Raman transition between the ground sublevels of the NVEs, we may manipulate the artificial reservoir by tuning the external driving fields. The TLR decay induces an artificial reservoir, which can drive the system to the desired entangled squeezed states. Our idea provides a scalable way to a NVE-based continuous-variable quantum-information processing, which is close to being achievable with currently available technology. © 2012 American Physical Society. Source


Liu C.,Hunan Normal University | Liu C.,Hunan Institute of Humanities, Science and Technology | Chen S.,Hunan Normal University | Jing J.,Hunan Normal University
Astrophysical Journal | Year: 2012

The properties of the ergosphere and energy extraction by the Penrose process in a rotating non-Kerr black hole are investigated. It is shown that the ergosphere is sensitive to the deformation parameter ε and the shape of the ergosphere becomes thick as parameter ε increases. It is of interest to note that, compared with the Kerr black hole, the deformation parameter ε can enhance the maximum efficiency of the energy extraction process greatly. Especially for the case of a > M, the non-Kerr metric describes a superspinning compact object and the maximum efficiency can exceed 60%, while it is only 20.7% for the extremal Kerr black hole. © 2012. The American Astronomical Society. All rights reserved.. Source


Liu C.-Q.,Hunan Institute of Humanities, Science and Technology
Chinese Physics Letters | Year: 2013

Collision of two general geodesic particles around the Kerr - Newman black hole is studied and the center-of-mass (cm.) energy of the non-marginally and marginally bound critical particles in the direct collision and the last stable orbit collision scenarios is obtained. The constraint conditions that arbitrarily high cm. energy can be obtained for the near-horizon collision of two general geodesic particles in the extremal Kerr - Newman black hole is found, and it is noted that the charge decreases the value of the latitude in which arbitrarily high cm. energy can occur. © 2013 Chinese Physical Society and IOP Publishing Ltd. Source


Yao W.,Hunan Normal University | Chen S.,Hunan Normal University | Liu C.,Hunan Normal University | Liu C.,Hunan Institute of Humanities, Science and Technology | Jing J.,Hunan Normal University
European Physical Journal C | Year: 2012

Department of Physics and Information Engineering, Hunan Institute of Humanities Science and Technology, Loudi, Hunan 417000, P.R. China Received: 27 October 2011 / Revised: 7 January 2012 Abstract We study the collision of two geodesic particles in the accelerating and rotating black hole spacetime and probe the effects of the acceleration of black hole on the center-of-mass energy of the colliding particles and on the high-velocity collision belts. We find that the dependence of the center-of-mass energy on the acceleration in the near event-horizon collision is different from that in the near acceleration-horizon case. Moreover, the presence of the acceleration changes the shape and position of the highvelocity collision belts. Our results show that the acceleration of black holes brings about richer physics for the collision of particles. © Springer-Verlag / Società Italiana di Fisica 2012. Source


Ding C.,Hunan Institute of Humanities, Science and Technology | Jing J.,Hunan Normal University
Journal of High Energy Physics | Year: 2011

Abstract: We study the influence of the spacetime noncommutative parameter on the strong field gravitational lensing in the noncommutative Reissner-Nordström black-hole spacetime. Supposing that the gravitational field of the supermassive central object of the Galaxy is described by this metric, we estimate the numerical values of the coefficients and observables for strong gravitational lensing. Our results show that with the increase of the parameter √θ, the observables θ∞ and rm decrease, while s increases. Our results also show that i) if √θ is strong, the observables are close to those of the noncommutative Schwarzschild black hole lensing; ii) if √θ is weak, the observables are close to those of the commutative Reissner-Nordström black hole lensing; iii) the detectable scope of √ in a noncommutative Reissner-Nordström black hole lensing is 0.12 ≤ √θ ≤ 0.26, which is wider than that in a noncommutative Schwarzschild black hole lensing, 0.18 ≤ √θ ≤ 0.26. This may offer a way to probe the spacetime noncommutative constant √ by the astronomical instruments in the future. © 2011 SISSA. Source

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