☆ 4.6 Article

Controllable manipulation and detection of local densities and bipartite entanglement in a quantum gas by a dissipative defect

PHYSICAL REVIEW A (2011)

期刊

PHYSICAL REVIEW A

卷 84, 期 4, 页码 -

出版社

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevA.84.041606

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Optics Physics, Atomic, Molecular & Chemical

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SNF
ANR (FAMOUS)
DARPA-OLE
Triangle de la Physique

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We study the complex dynamics of a one-dimensional Bose gas subjected to a dissipative local defect which induces one-body atom losses. In experiments these atom losses occur, for example, when a focused electron or light beam or a single trapped ion is brought into contact with a quantum gas. We discuss how within such setups one can measure or manipulate densities locally and specify the excitations that are induced by the defect. In certain situations the defect can be used to generate entanglement in a controlled way despite its dissipative nature. The careful examination of the interplay between hole excitations and the collapse of the wave function due to nondetection of loss is crucial for the understanding of the dynamics we observe.

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Bipartite entanglement distillation by unilateral and bilateral local filters using polarizing Mach-Zehnder interferometers

P. Dhilipan, K. Srinivasan, G. Raghavan

Summary: The extraordinary correlation seen in entangled states in space-like separated regions is one of the most intriguing aspects of quantum states. In practice, entanglement quality degrades substantially due to channel noise. The problem may be mitigated by entanglement distillation. The simplest distillation protocol is enforced by local filtering operations and classical communication. In this work, we experimentally show that filtering on a single channel (unilateral) is equally effective as filtering on both channels (bilateral) for distillation of pure non-maximally entangled bipartite states. This result holds for a non-maximally entangled multi-qubit Greenberger-Horne-Zeilinger (GHZ) like states as well, as they show a straightforward extension of the Bell state structure. Further, we provide a theoretical comparison of the efficacy of unilateral and bilateral filtering for the case of mixed states resulting from local depolarizing noise introduced either in one or both of the non-maximally entangled pairs. Surprisingly, when noise is introduced in either one of the channels, we find that unilateral filtering on the noise-free channel outperforms the filtering on the noisy channel and bilateral filtering on both channels. We also find that bilateral filtering is more effective when both channels are noisy. A reduction in the number of local operations, in general, has the advantage of reducing the complexity of the experimental apparatus and the reduction of measurement related errors.

JOURNAL OF APPLIED PHYSICS (2023)