Effects of Energy Dissipation on the Parametric Excitation of a Coupled Qubit–Cavity System
We consider a parametrically driven system of a qubit coupled to a cavity taking into account different channels of energy dissipation. We focus on the periodic modulation of a single parameter of this hybrid system, which is the coupling constant between the two subsystems. Such a modulation is possible within the superconducting realization of qubit–cavity coupled systems, characterized by an outstanding degree of tunability and flexibility. Our major result is that energy dissipation in the cavity can enhance population of the excited state of the qubit in the steady state, while energy dissipation in the qubit subsystem can enhance the number of photons generated from vacuum. We find optimal parameters for the realization of such dissipation-induced amplification of quantum effects. Our results might be of importance for the full control of quantum states of coupled systems as well as for the storage and engineering of quantum states.
KeywordsQubit Cavity Energy dissipation Parametric resonance Superconducting quantum circuits
D. S. S. acknowledges support by the Fellowship of the President of Russian Federation for young scientists (Fellowship No. SP-2044.2016.5), the Russian Science Foundation (Contract No. 16-12-00095) and by a joint grant of Russian Science Foundation and Deutsche Forschungsgemeinschaft (Grant No. 16-42-01035). W. V. P. acknowledges support by Russian Foundation for Basic Research (Project No. 15-02-02128) and by Ministry of Education and Science of the Russian Federation (Grant No. 14.Y26.31.0007). Yu. E. L. acknowledges support from Russian Foundation for Basic Research (Project No. 17-02-01134).
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