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

Cited by in corpus (6)

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• Entanglement of superconducting qubits via microwave fields: classical and quantum regimes
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• Coherence of a Josephson phase qubit under partial-collapse measurement
• Measurement-induced entanglement of two superconducting qubits