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Mapping quantum state dynamics in spontaneous emission

Author

Listed:
  • M. Naghiloo

    (Washington University)

  • N. Foroozani

    (Washington University)

  • D. Tan

    (Washington University)

  • A. Jadbabaie

    (Washington University)

  • K. W. Murch

    (Washington University
    Institute for Materials Science and Engineering)

Abstract

The evolution of a quantum state undergoing radiative decay depends on how its emission is detected. If the emission is detected in the form of energy quanta, the evolution is characterized by a quantum jump to a lower energy state. In contrast, detection of the wave nature of the emitted radiation leads to different dynamics. Here, we investigate the diffusive dynamics of a superconducting artificial atom under continuous homodyne detection of its spontaneous emission. Using quantum state tomography, we characterize the correlation between the detected homodyne signal and the emitter’s state, and map out the conditional back-action of homodyne measurement. By tracking the diffusive quantum trajectories of the state as it decays, we characterize selective stochastic excitation induced by the choice of measurement basis. Our results demonstrate dramatic differences from the quantum jump evolution associated with photodetection and highlight how continuous field detection can be harnessed to control quantum evolution.

Suggested Citation

  • M. Naghiloo & N. Foroozani & D. Tan & A. Jadbabaie & K. W. Murch, 2016. "Mapping quantum state dynamics in spontaneous emission," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11527
    DOI: 10.1038/ncomms11527
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