Tracking quantum coherence in polariton condensates with time-resolved
tomography
- URL: http://arxiv.org/abs/2209.07129v1
- Date: Thu, 15 Sep 2022 08:22:58 GMT
- Title: Tracking quantum coherence in polariton condensates with time-resolved
tomography
- Authors: Carolin L\"uders, Matthias Pukrop, Franziska Barkhausen, Elena Rozas,
Christian Schneider, Sven H\"ofling, Jan Sperling, Stefan Schumacher, Marc
A{\ss}mann
- Abstract summary: We harness non-Gaussian convolutions of highly singular Glauber-Sudarshan quasiprobabilities to dynamically monitor quantum coherence in polariton condensates.
We probe the systems's resourcefulness for quantum information processing up to the nanosecond regime.
In contrast to commonly applied phase-space functions, our distributions can be directly sampled from measured data.
- Score: 0.22766070234899094
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Long-term quantum coherence constitutes one of the main challenges when
engineering quantum devices. However, easily accessible means to quantify
complex decoherence mechanisms are not readily available, nor are sufficiently
stable systems. We harness novel phase-space methods - expressed through
non-Gaussian convolutions of highly singular Glauber-Sudarshan
quasiprobabilities - to dynamically monitor quantum coherence in polariton
condensates with significantly enhanced coherence times. Via intensity- and
time-resolved reconstructions of such phase-space functions from homodyne
detection data, we probe the systems's resourcefulness for quantum information
processing up to the nanosecond regime. Our experimental findings are confirmed
through numerical simulations for which we develop an approach that renders
established algorithms compatible with our methodology. In contrast to commonly
applied phase-space functions, our distributions can be directly sampled from
measured data, including uncertainties, and yield a simple operational measure
of quantum coherence via the distribution's variance in phase. Therefore, we
present a broadly applicable framework and a platform to explore time-dependent
quantum phenomena and resources.
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