Critical Response of a Quantum van der Pol Oscillator.

Authors
Cooper, Nigel R 

Change log
Abstract

Classical dynamical systems close to a critical point are known to act as efficient sensors due to a strongly nonlinear response. We explore such systems in the quantum regime by modeling a quantum version of a driven van der Pol oscillator. We find the classical response survives down to one excitation quantum. At very weak drives, genuine quantum features arise, including diverging and negative susceptibilities. Further, the linear response is greatly enhanced by using a strong incoherent pump. These results are largely generic and can be probed in current experimental platforms suited for quantum sensing.

Publication Date
2019-12-20
Online Publication Date
2019-12-20
Acceptance Date
2019-11-12
Keywords
quant-ph, quant-ph, cond-mat.quant-gas
Journal Title
Phys Rev Lett
Journal ISSN
0031-9007
1079-7114
Volume Title
123
Publisher
American Physical Society (APS)
Rights
All rights reserved
Sponsorship
Engineering and Physical Sciences Research Council (EP/P009565/1)
Simons Foundation (511029)