Nonclassical photon number distribution in a superconducting cavity under a squeezed drive

Abstract

A superconducting qubit in the strong dispersive regime of a circuit quantum electrodynamics system is a powerful probe for microwave photons in a cavity mode. In this regime, a qubit spectrum is split into multiple peaks, with each peak corresponding to an individual photon number in the cavity (discrete ac Stark shift). Here, we measure the qubit spectrum in the cavity that is driven continuously with a squeezed vacuum field generated by a Josephson parametric amplifier. By fitting the qubit spectrum with a model which takes into account the finite qubit excitation power, the photon number distribution, which is dissimilar from the apparent peak area ratio in the spectrum, is determined. The photon number distribution shows the even-odd photon number oscillation and quantitatively fulfills Klyshko's criterion for the nonclassicality.

10 pages, 11 figures, 1 table

References in corpus (9)

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• Wigner negativity in the steady-state output of a Kerr parametric oscillator
• Resolving nonclassical magnon composition of a magnetic ground state via a qubit
• Nonclassicality detection from few Fock-state probabilities
• Two-qubit gate using conditional driving for highly detuned Kerr-nonlinear parametric oscillators
• Squeezing enhanced atom-cavity interaction in coupled cavities with high dissipation rates
• Quantum Sensing of Antiferromagnetic Magnon Two-Mode Squeezed Vacuum
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• Photon-number resolution with microwave Josephson photomultipliers
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• Sensing single atoms in a cavity using a broadband squeezed light
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• Detection of the phase shift of an alternating-current magnetic field by quantum sensing with multiple-pulse decoupling sequences
• Exploring higher Jaynes-Cummings doublet in cavity quantum electrodynamics system with a broadband squeezed vacuum injection
• Squeezing and quantum control of antiferromagnetic magnon pseudospin