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Physics

And Then There Was One

Anonymous

Published Feb 9, 2012• 0 citations
Publisher
DOI
10.1103/physics.5.s21

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Abstract Einstein–Podolsky–Rosen (EPR) steering is different from quantum entanglement because of its unique asymmetry. Multipartite asymmetric EPR steering can break through one-to-one monogamy steering and achieve one to many one-way steering. That is to say, the state of one part can steer the other rest parts simultaneously, while the other parts cannot steer this part. Here, a scheme is proposed to generate one to many one-way steering by optical parametric amplification cascaded with a sum-frequency generation process. One to many non-monogamy EPR steering, such as one to two and one to three one-way steering are demonstrated based on the criterion for asymmetric EPR steering. It is also find that different kinds of asymmetric EPR steering can be obtained by choosing different nonlinear parameters. This non-monogamous one to many quantum control has potential application in constructing quantum networks and realizing one-way quantum computing.
One-atom maser and one-atom laser are important experimental proving grounds in the study on cavity quantum electrodynamics(CQED).This paper reviews the studies on several types of one-atom masers and one-atom lasers,including the one-atom maser of Walther's group,the one-atom maser injected with ultracold atoms,the CQED system of Haroche's group,the one-atom laser with injected atoms,the one-atom laser with a single trapped ion,and the one-atom laser with a single trapped atom.The author introduces typical experimental systems and their main results,and also reviews relevant theoretical works.