Rapid Ballistic Readout for Flux Qubits

Abstract

We suggest a new type of the magnetic flux detector which can be optimized with respect to the measurement back-action, e.g. for the situation of quantum measurements. The detector is based on manipulation of ballistic motion of individual fluxons in a Josephson transmission line (JTL), with the output information contained in either probabilities of fluxon transmission/reflection, or time delay associated with the fluxon propagation through the JTL. We calculate the detector characteristics of the JTL and derive equations for conditional evolution of the measured system both in the transmission/reflection and the time-delay regimes. Combination of the quantum-limited detection with control over individual fluxons should make the JTL detector suitable for implementation of non-trivial quantum measurement strategies, including conditional measurements and feedback control schemes.

12 pages, 5 figures

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• Verification of stable operation of rapid single flux quantum devices with selective dissipation
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• Ring Oscillators for Clocking Reversible Superconducting Circuits and Fabrication Process Benchmarking
• Simulation of a rapid qubit readout dependent on the transmission of a single fluxon
• Flat and almost flat bands in the quasi-one-dimensional Josephson junction array
• Tunneling without tunneling: wavefunction reduction in a mesoscopic qubit