Interaction-free measurements with superconducting qubits

Abstract

An interaction-free measurement protocol is described for a quantum circuit consisting of a superconducting qubit and a read-out Josephson junction. By measuring the state of the qubit one can ascertain the presence of a current pulse through the circuit at a previous time without any energy exchange between the qubit and the pulse.

4 pages, 2 figures

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• Experimenting quantum phenomena on NISQ computers using high level quantum programming
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• Paradoxical consequences of multipath coherence: perfect interaction-free measurements
• Coherent interaction-free detection of noise
• Theory of coherent interaction-free detection of pulses
• Electronic and thermal sequential transport in metallic and superconducting two-junction arrays
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• Simulation of motional averaging using a superconducting circuit