Rapid purification of a solid state charge qubit

Jason F. Ralph; Elias J. Griffith; Charles D. Hill; Terence D. Clark

doi:10.1117/12.665403

12 May 2006 Rapid purification of a solid state charge qubit

Jason F. Ralph, Elias J. Griffith, Charles D. Hill, Terence D. Clark

Proceedings Volume 6244, Quantum Information and Computation IV; 624403 (2006) https://doi.org/10.1117/12.665403
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

This paper discusses the use of continuous weak measurement and quantum feedback for the rapid purification of the quantum state of a model solid state qubit: a superconducting Cooper pair box. The feedback algorithm uses Jacobs' rapid purification protocol, which starts with a completely mixed state and applies controls to rotate the qubit Bloch vector onto the plane orthogonal to the measurement axis. This rotation maximises the rate of increase of the average purity of the state but can require large changes in the control fields to produce the required rotation. Since solid state qubits have finite controls and feedback channels have limited bandwidth, such rotations may not be practical. This paper applies Jacobs' protocol to the Cooper pair box with realistic control fields.

Citation Download Citation

Jason F. Ralph, Elias J. Griffith, Charles D. Hill, and Terence D. Clark "Rapid purification of a solid state charge qubit", Proc. SPIE 6244, Quantum Information and Computation IV, 624403 (12 May 2006); https://doi.org/10.1117/12.665403

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