A robust protocol for entropy measurement in mesoscopic circuits

Abstract

Previous measurements utilizing Maxwell relations to measure change in entropy, $S$, demonstrated remarkable accuracy of measuring the spin-1/2 entropy of electrons in a weakly coupled quantum dot. However, these previous measurements relied upon prior knowledge of the charge transition lineshape. This had the benefit of making the determination of entropy independent of measurement scaling, but at the cost of limiting the applicability of the approach to relatively simple systems. To measure entropy of more exotic mesoscopic systems, a new analysis technique can be employed; however, doing so requires precise knowledge of the measurement scaling. Here, we give details on the necessary improvements made to the original experimental approach and highlight some of the common challenges (along with strategies to overcome them) that other groups may face when attempting this type of measurement.

References in corpus (6)

• Single-shot read-out of an individual electron spin in a quantum dot
• In situ reduction of charge noise in GaAs/AlGaAs Schottky-gated devices
• Entropy measurement of a strongly coupled quantum dot
• Majorana ensembles with fractional entropy and conductance in nanoscopic systems
• Entanglement, measurement, and conditional evolution of the Kondo singlet interacting with a mesoscopic detector
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Cited by in corpus (15)

• Entropy measurement of a strongly coupled quantum dot
• Majorana differential shot noise and its universal thermoelectric crossover
• Electronic measurements of entropy in meso- and nanoscale systems
• Entanglement measures of Majorana bound states
• Multichannel topological Kondo effect
• Quantized spin pumping in topological ferromagnetic-superconducting nanowires
• Master equation approach for transport through Majorana zero modes
• Nonequilibrium finite frequency resonances in differential quantum noise driven by Majorana interference
• Measuring statistics-induced entanglement entropy with a Hong-Ou-Mandel interferometer
• Measuring topological entanglement entropy using Maxwell relations
• Identifying an environment-induced localization transition from entropy and conductance
• Entropy spectroscopy of a bilayer graphene quantum dot
• Entropy of a double quantum dot
• Thermoelectric fluctuations of interfering Majorana bound states
• Revealing universal Majorana fractionalization using differential shot noise and conductance in nonequilibrium states controlled by tunneling phases