Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present a theoretical study of a superconducting charge qubit dispersivelycoupled to a transmission line resonator. Starting from a master equationdescription of this coupled system and using a polaron transformation, weobtain an exact effective master equation for the qubit. We then use quantumtrajectory theory to investigate the measurement of the qubit by continuoushomodyne measurement of the resonator out-field. Using the same porlarontransformation, a stochastic master equation for the conditional state of thequbit is obtained. From this result, various definitions of the measurementtime are studied. Furthermore, we find that in the limit of strong homodynemeasurement, typical quantum trajectories for the qubit exhibit a crossoverfrom diffusive to jump-like behavior. Finally, in the presence of Rabi drive onthe qubit, the qubit dynamics is shown to exhibit quantum Zeno behavior.



Author: Jay Gambetta, Alexandre Blais, M. Boissonneault, A. A. Houck, D. I. Schuster, S. M. Girvin

Source: https://arxiv.org/







Related documents