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Exploring Dephasing of a Solid-State Quantum Emitter via Time- and Temperature-Dependent Hong-Ou-Mandel Experiments
A Thoma1, P Schnauber1, M Gschrey1
1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany.
Physical Review Letters
|February 6, 2016
Summary
We investigated photon indistinguishability from quantum dots using two-photon interference. Results show reduced visibility over time and with increasing temperature, linked to charge traps and phonon effects.
Area of Science:
- Quantum Optics
- Solid-State Physics
- Materials Science
Background:
- Quantum dots (QDs) are promising sources for quantum information technologies.
- Photon indistinguishability is crucial for quantum interference phenomena.
- Understanding decoherence mechanisms in QDs is essential for device performance.
Purpose of the Study:
- To probe the indistinguishability of photons emitted by a semiconductor quantum dot (QD).
- To investigate the influence of time and temperature on two-photon interference (TPI).
- To characterize decoherence pathways affecting quantum emitter coherence.
Main Methods:
- Performed time- and temperature-dependent two-photon interference (TPI) experiments.
- Analyzed TPI visibility as a function of temporal separation between photon emissions.
- Utilized theoretical modeling describing non-Markovian noise processes.
Main Results:
- Decreased TPI visibility observed with increasing temporal separation on a nanosecond timescale.
- Visibility reduction attributed to non-Markovian noise from fluctuating charge traps.
- Phonon-induced pure dephasing reduced TPI visibility from (96±4)% at 10 K to vanishing at 40 K.
Conclusions:
- The study quantifies photon indistinguishability from QDs under varying conditions.
- Fluctuating charge traps and phonon interactions significantly impact quantum emitter coherence.
- The experimental approach offers direct access to time-dependent coherence on nanosecond timescales.
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