Measuring the quality factor of a microwave cavity using superconduting qubit devices

Abstract

We propose a method to create superpositions of two macroscopic quantum states of a single-mode microwave cavity field interacting with a superconducting charge qubit. The decoherence of such superpositions can be determined by measuring either the Wigner function of the cavity field or the charge qubit states. Then the quality factor Q of the cavity can be inferred from the decoherence of the superposed states. The proposed method is experimentally realizable within current technology even when the $Q$ value is relatively low, and the interaction between the qubit and the cavity field is weak.

8 pages

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• Electromagnetically induced transparency and Autler-Townes splitting in superconducting flux quantum circuits
• Superconducting qubits can be coupled and addressed as trapped ions
• Variable-frequency-controlled coupling in charge qubit circuits: Effects of microwave field on qubit-state readout
• Switchable coupling between charge and flux qubits
• Criticality-enhanced quantum sensor at finite temperature
• Quantum phase measurement and Gauss sum factorization of large integers in a superconducting circuit
• Delayed creation of entanglement in superconducting qubits interacting with a microwave field
• Some implications of superconducting quantum interference to the application of master equations in engineering quantum technologies
• Effects of Resonant Cavity on Macroscopic Quantum Tunneling of Fluxon in Long Josephson Junctions