Decoherence and Quantum Fluctuations
P. Mohanty, R.A. Webb
TL;DR
This paper demonstrates that quantum electromagnetic fluctuations set a fundamental limit on phase coherence times in mesoscopic systems at low temperatures, with derived formulas matching experimental observations.
Contribution
It derives a quantum noise limited dephasing time and its temperature dependence, connecting quantum fluctuations to experimental phase coherence limits.
Findings
Quantum fluctuations limit phase coherence at low temperatures.
Derived dephasing time matches experimental data.
Identified crossover from quantum to thermal dephasing regimes.
Abstract
We show that the zero-point fluctuations of the intrinsic electromagnetic environment limit the phase coherence time in all mesoscopic systems at low temperatures. We derive this quantum noise limited dephasing time and its temperature dependence in the crossover to the thermal regime. Our results agree well with most experiments in 1D systems.
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