Adiabatic Elimination of Gaussian Subsystems from Quantum Dynamics under Continuous Measurement

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Adiabatic Elimination of Gaussian Subsystems from Quantum Dynamics under Continuous Measurement

Authors
  • Černotík, Ondřej
  • Denis V. Vasilyev
  • Klemens Hammerer
Type
Published Article
Journal
Physical Review A
Publisher
American Physical Society
Publication Date
July 2015
Volume
92
Issue
1
Source
MyScienceWork
License
Blue

Abstract

An ever broader range of physical platforms provides the possibility to study and engineer quantum dynamics under continuous measurements. In many experimental arrangements the system of interest is monitored by means of an ancillary device, whose sole purpose is to transduce the signal from the system to the measurement apparatus. Here, we present a method of adiabatic elimination when the transducer consists of an arbitrary number of bosonic modes with Gaussian dynamics while the measured object can be any quantum system. Crucially, our approach can cope with the highly relevant case of finite temperature of the transducer, which is not easily achieved with other methods. We show that this approach provides a significant improvement in the readout of super-conducting qubits in circuit QED already for a few thermal excitations, and admits to adiabatically eliminate optomechanical transducers.

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