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【期刊论文】Einstein-Podolsky-Rosen sideband entanglement in broadband squeezed light
张靖, Jing Zhang*
PHYSICAL REVIEW A 67, 054302 (2003),-0001,():
-1年11月30日
In this paper we investigate the squeezing of a finite-bandwidth optical field which may be thought of as originating from Einstein-Podolsky-Rosen-(EPR-) like quantum correlations between the upper and lower sidebands. Ordinarily, when EPR pairs are created from such a resource, the bandwidth is preserved, and the signal-to-noise ratio of the quadrature correlations is reduced. Here we show that by using frequencydependent beam splitters we may create N EPR pairs from a single finite-bandwidth squeezed beam with no reduction in the correlations's signal-to-noise ratio. However, the bandwidth is reduced by a factor of N relative to the original squeezed beam. Because this transformation is linear it may be inverted to retrieve the single squeezed beam from the corresponding N EPR pairs.
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【期刊论文】Quantum entanglement and squeezing of the quadrature difference of bright light fields
张靖, Jing Zhang, Changde Xie, and Kunchi Peng*
PHYSICAL REVIEW A 66, 042319 (2002),-0001,():
-1年11月30日
In this paper we present a scheme in which the amplitude-quadrature difference and phase-quadrature difference of two bright nonclassical beams serve as a pair of observed complementary variables that can be measured directly and can form a new squeezed state. Mixing such two quadrature-difference squeezed-state beams on a beam splitter produces characteristic of the Einstein-Podolsky-Rosen quantum entanglement. The experimental schemes producing such nonclassical beams and its possible applications in quantum information are discussed.
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【期刊论文】Controlled dense coding for continuous variables using three-particle entangled states
张靖, Jing Zhang, Changde Xie, and Kunchi Peng*
PHYSICAL REVIEW A, 66, 032318 (2002),-0001,():
-1年11月30日
A simple scheme to realize quantum controlled dense coding with a bright tripartite entangled state light generated from nondegenerate optical parametric amplifiers is proposed in this paper. The quantum channel between Alice and Bob is controlled by Claire. As a local oscillator and balanced homodyne detector are not needed, the proposed protocol is easy to be realized experimentally.
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【期刊论文】P-wave Feshbach resonances of ultracold 6Li
张靖, J. Zhang, , E. G. M. van Kempen, T. Bourdel, L. Khaykovich, J. Cubizolles, F. Chevy, M. Teichmann, L. Tarruell, S. J. J. M. F. Kokkelmans, and C. Salomon
PHYSICAL REVIEW A 70, 030702(R) (2004),-0001,():
-1年11月30日
We report the observation of three p-wave Feshbach resonances of 6Li atoms in the lowest hyperfine state f=1/2. The positions of the resonances are in good agreement with theory. We study the lifetime of the cloud in the vicinity of the Feshbach resonances and show that, depending on the spin states, two-or three-body mechanisms are at play. In the case of dipolar losses, we observe a nontrivial temperature dependence that is well explained by a simple model.
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【期刊论文】Experimental Study of the BEC-BCS Crossover Region in Lithium 6
张靖, T. Bourdel, L. Khaykovich, J. Cubizolles, J. Zhang, F. Chevy, M. Teichmann, L. Tarruell, S. J. J.M. F. Kokkelmans, and C. Salomon
PHYSICAL REVIEW LETTERS 2004, 93 (5): 1~4,-0001,():
-1年11月30日
We report Bose-Einstein condensation of weakly bound 6Li2 molecules in a crossed optical trap near a Feshbach resonance. We measure a molecule-molecule scattering length of 170+100-60nm at 770G, in good agreement with theory. We study the 2D expansion of the cloud and show deviation from hydrodynamic behavior in the BEC-BCS crossover region.
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