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29 March 2024
 
  » arxiv » cond-mat/0510771

 Article overview


Rapid Ballistic Readout for Flux Qubits
Dmitri V. Averin ; Kristian Rabenstein ; Vasili K. Semenov ;
Date 28 Oct 2005
Subject Mesoscopic Systems and Quantum Hall Effect; Superconductivity
AbstractWe 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.
Source arXiv, cond-mat/0510771
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