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Title: Protecting and enhancing spin squeezing via continuous dynamical decoupling
Authors: Chaudhry, A.Z.
Gong, J. 
Issue Date: 13-Jul-2012
Citation: Chaudhry, A.Z., Gong, J. (2012-07-13). Protecting and enhancing spin squeezing via continuous dynamical decoupling. Physical Review A - Atomic, Molecular, and Optical Physics 86 (1) : -. ScholarBank@NUS Repository.
Abstract: Realizing useful quantum operations with high fidelity is a two-task quantum control problem wherein decoherence is to be suppressed and desired unitary evolution is to be executed. The dynamical decoupling (DD) approach to decoherence suppression has been fruitful but synthesizing DD fields with certain quantum control fields may be experimentally demanding. In the context of spin squeezing, here we explore an unforeseen possibility that continuous DD fields may serve dual purposes at once. In particular, it is shown that a rather simple configuration of DD fields can suppress collective decoherence and yield a 1/N scaling of the squeezing performance (N is the number of spins), thus making spin squeezing more robust to noise and much closer to the so-called Heisenberg limit. The theoretical predictions should be within the reach of current spin squeezing experiments. © 2012 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.86.012311
Appears in Collections:Staff Publications

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