Characterizing polariton states in the nondispersive regime of circuit quantum electrodynamics

Mamgain, A and Hawaldar, S and Shankar, A and Suri, B (2023) Characterizing polariton states in the nondispersive regime of circuit quantum electrodynamics. In: Physical Review A, 108 (3).

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Abstract

A superconducting qubit coupled to a readout resonator is currently the building block of multiple quantum computing as well as quantum optics experiments. A typical qubit-resonator system is coupled in the dispersive regime, where the detuning between qubit and resonator is much greater than the coupling between them. In this work, we fabricated and measured a superconducting transmon-resonator system in the nondispersive regime. The dressed states formed by the mixing of the bare qubit and resonator states can be further mixed by applying a drive on the qubit, leading to the formation of polariton states. We report experimental studies of transitions between polariton states at varying driving powers and frequencies and show how the nondispersive coupling of the higher levels of the qubit-resonator system modifies the polariton eigenstates and the corresponding transition frequencies. We also report close agreement with numerical results obtained from a driven Jaynes-Cummings model beyond the dispersive regime. © 2023 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review A
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society.
Keywords:	Electrodynamics; Phonons; Photons; Quantum optics; Qubits; Superconducting resonators; Timing circuits, Building blockes; Detunings; Dispersive regime; Dressed state; Driving frequencies; Driving power; Polaritons; Quantum Computing; Quantum electrodynamics; Superconducting qubits, Polariton
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	01 Dec 2023 04:27
Last Modified:	01 Dec 2023 04:27
URI:	https://eprints.iisc.ac.in/id/eprint/83432

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