Measurement back-action in stacked graphene quantum dots

Abstract

We present an electronic transport experiment in graphene where both classical and quantum mechanical charge detector back-action on a quantum dot are investigated. The device consists of two stacked graphene quantum dots separated by a thin layer of boron nitride. This device is fabricated by van der Waals stacking and is equipped with separate source and drain contacts to both dots. By applying a finite bias to one quantum dot, a current is induced in the other unbiased dot. We present an explanation of the observed measurement-induced current based on strong capacitive coupling and energy dependent tunneling barriers, breaking the spatial symmetry in the unbiased system. This is a special feature of graphene-based quantum devices. The experimental observation of transport in classically forbidden regimes is understood by considering higher order quantum mechanical back-action mechanisms.

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• Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure
• Radio-frequency reflectometry in bilayer graphene devices utilizing micro graphite back-gates
• Engineering drag currents in Coulomb coupled quantum dots
• Isolated and hybrid bilayer graphene rings
• Generalized Landauer formula for time-dependent potentials and noise-induced zero-bias dc current
• Heat transport through a two-level system under continuous quantum measurement
• Interaction-induced charge transfer in a mesoscopic electron spectrometer
• Quantum thermocouples: nonlocal conversion and control of heat in nanostructures
• Performance of the T-matrix based master equation for Coulomb drag in double quantum dots
• Sensing electrons during an adiabatic coherent transport passage
• Quantum measurement induces a many-body transition
• Making the Virtual Real: Measurement-Powered Tunneling Engines
• Effect of the readout efficiency of quantum measurement on the system entanglement
• Realizing the interacting resonant level model using a quantum dot detector
• Transport out of locally broken detailed balance
• Charge and energy transfer in ac-driven Coulomb-coupled double quantum dots
• Back-action effects in charge detection
• Back-action effects in cavity-coupled quantum conductors
• Coupling-energy driven pumping through quantum dots: Role of coherences