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Updated: Jan 27, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Gated Conditional Displacement Readout of Superconducting Qubits
S Touzard1, A Kou1, N E Frattini1
1Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA.
Abstract:
We have realized a new interaction between superconducting qubits and a readout cavity that results in the displacement of a coherent state in the cavity, conditioned on the state of the qubit. This conditional state, when it reaches the cavity-following, phase-sensitive amplifier, matches its measured observable, namely, the in phase quadrature. In a setup where several qubits are coupled to the same readout resonator, we show it is possible to measure the state of a target qubit with minimal dephasing of the other qubits. Our results suggest novel directions for faster readout of superconducting qubits and implementations of bosonic quantum error-correcting codes.
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