Mapping quantum state dynamics in spontaneous emission

25Citations
Citations of this article
58Readers
Mendeley users who have this article in their library.

This article is free to access.

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.

Cite

CITATION STYLE

APA

Naghiloo, M., Foroozani, N., Tan, D., Jadbabaie, A., & Murch, K. W. (2016). Mapping quantum state dynamics in spontaneous emission. Nature Communications, 7. https://doi.org/10.1038/ncomms11527

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free