scholarly journals Non-Gaussian entangled states and quantum metrology with ultracold atomic ensemble

2019 ◽  
Vol 68 (4) ◽  
pp. 040306
Author(s):  
Bo Lu ◽  
Cheng-Yin Han ◽  
Min Zhuang ◽  
Yong-Guan Ke ◽  
Jia-Hao Huang ◽  
...  
Keyword(s):  
Entangled States ◽  
Atomic Ensemble ◽  
Quantum Metrology ◽  
Non Gaussian

Quantum Metrology Based on Nonclassical Atomic States

2021 ◽  
Vol 30 (3) ◽  
pp. 8-12
Author(s):  
Jae Hoon LEE ◽  
Hyojun SEOK
Keyword(s):  
Quantum Physics ◽  
Quantum Measurements ◽  
Atomic Ensemble ◽  
Collective State ◽  
Quantum Metrology ◽  
Future Prospects ◽  
Measurement Sensitivity ◽  
Crucial Information ◽  
Quantum Technology ◽  
Atomic States

Quantum measurements with atoms have been at the forefront of quantum technology and provide crucial information for a better understanding of quantum physics ever since their conception over a century ago. The universality of the quantized energy states of atoms makes the collective state of an atomic ensemble an outstanding platform for quantum-enhanced metrology. We introduce basic concepts regarding the metrological gain acquired from using nonclassical quantum states via multiparticle entanglement. Current challenges and future prospects for further enhancement of the measurement sensitivity through the use of nonclassical atomic states are discussed with reference to the shot noise and Heisenberg limits.

Nonclassical properties and entanglement of non-Gaussian entangled states generated via multiple-photon subtraction on two-mode squeezed coherent states

Optik ◽  
2015 ◽  
Vol 126 (24) ◽  
pp. 5102-5108 ◽  
Author(s):  
Li-Li Hou ◽  
Xian-Feng Chen ◽  
Shuai Wang
Keyword(s):  
Coherent States ◽  
Entangled States ◽  
Nonclassical Properties ◽  
Photon Subtraction ◽  
Non Gaussian

scholarly journals Generation of Mesoscopic Entangled States in a Cavity Coupled to an Atomic Ensemble

2012 ◽  
Vol 108 (12) ◽  
Author(s):  
G. Nikoghosyan ◽  
M. J. Hartmann ◽  
M. B. Plenio
Keyword(s):  
Entangled States ◽  
Atomic Ensemble

An application of two-photon entangled states to quantum metrology

2000 ◽  
Vol 47 (12) ◽  
pp. 2099-2104 ◽  
Author(s):  
G. Brida, M. Genovese, C. Novero
Keyword(s):  
Entangled States ◽  
Quantum Metrology ◽  
Two Photon

scholarly journals Detection of non-Gaussian entangled states with an improved continuous-variable separability criterion

2016 ◽  
Vol 93 (3) ◽  
Author(s):  
Anaelle Hertz ◽  
Evgueni Karpov ◽  
Aikaterini Mandilara ◽  
Nicolas J. Cerf
Keyword(s):  
Continuous Variable ◽  
Entangled States ◽  
Separability Criterion ◽  
Non Gaussian

Quantum non-gaussianity from an indefnite causal order of Gaussian operations

2021 ◽  
Author(s):  
Seid Koudia ◽  
Abdelhakim Gharbi
Keyword(s):  
Quantum Information ◽  
Quantum Key Distribution ◽  
Degrees Of Freedom ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Quantum Metrology ◽  
Causal Order ◽  
Gaussian States ◽  
Control Qubit ◽  
Non Gaussian

Quantum non-Gaussian states are considered a useful resource for many tasks in quantum information processing, from quantum metrology and quantum sensing to quantum communication and quantum key distribution. Another useful tool that is gaining attention is the newly constructed quantum switch. Its applications in many tasks in quantum information have been proved to outperform many existing schemes in quantum communication and quantum thermometry. In this contribution, we demonstrate this to be very useful for engineering highly non-Gaussian states from Gaussian operations whose order is controlled by degrees of freedom of a control qubit. The nonconvexity of the set of Gaussian states and the set of Gaussian operations guarantees the emergence of non-Gaussianity after post-selection on the control qubit deterministically, in contrast to existing protocols in the literature. The nonclassicality of the resulting states is discussed accordingly.

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