A single quantum dot as an optical thermometer for mK temperatures

Abstract

Resonant laser spectroscopy of a negatively charged self-assembled quantum dot is utilized to measure the temperature of a three dimensional fermionic reservoir down to 100mK. With a magnetic field applied to the quantum dot the single charged ground state is split by the Zeeman energy. As the quantum dot is in tunnel contact with a thermal electron reservoir, a thermal occupation of the quantum dot spin states is enforced by co-tunneling processes. Resonant laser induced fluorescence is used in order to measure the thermal quantum dot spin state population.

11 pages, 4 figures

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• Optimal Quantum Thermometry with Coarse-grained Measurements
• Non-Markovian quantum thermometry
• Local Temperatures Out of Equilibrium
• A dynamical approach to ancilla assisted quantum thermometry
• Spectroscopy and critical quantum thermometry in the ultrastrong coupling regime
• Spectral signatures of non-thermal baths in quantum thermalization
• Few-fermion thermometry
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• Optical simulation of a quantum thermal machine
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• Spin-valley relaxation dynamics of Landau-quantized electrons in MoSe${}_2$ monolayer
• A multifunctional quantum thermal device: with and without inner coupling
• Internal Photo Effect from a Single Quantum Emitter
• Topological quantum thermometry
• Measure the temperature of the spin via weak measurement