Tuning the initial phase to control the final state of a driven qubit

Kofman, Polina O.; Shevchenko, Sergey N.; Nori, Franco

doi:10.1103/physreva.109.022409

Phys. Rev. A

2024

DOI: 10.1103/physreva.109.022409

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Tuning the initial phase to control the final state of a driven qubit

Polina O. Kofman,

Sergey N. Shevchenko,

Franco Nori

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2024

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Flux qubit based detector of microwave photons

Ilinskaya,

Ryzhov,

Shevchenko

2024

Phys. Rev. B

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A theory of detection of microwave photons with a flux qubit based detector is presented. We consider a semiclassical approximation with the electromagnetic field being in a coherent state. The flux qubit is considered as a multilevel quantum system (qudit). By solving the Lindblad equation, we describe the time evolution of occupations of the qudit's levels for readout and reset stages of detection. When considering the reset stage, the time evolution is described by multiple avoided-level crossings, thus providing a multilevel Landau-Zener-Stückelberg-Majorana (LZSM) problem. In addition to numerical calculations, we present an approximate solution for the description of the reset stage dynamics based on the adiabatic-impulse approximation and rate equation approach. Our theory may be useful for the theoretical description of driven-dissipative dynamics of qudits, including applications such as single-photon detection. Published by the American Physical Society 2024

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Flux qubit based detector of microwave photons

Ilinskaya,

Ryzhov,

Shevchenko

2024

Phys. Rev. B

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show abstract

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Tuning the initial phase to control the final state of a driven qubit

Cited by 1 publication

References 47 publications

Flux qubit based detector of microwave photons

Flux qubit based detector of microwave photons

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