Detector-induced backaction on the counting statistics of a double quantum dot

Abstract

Full counting statistics of electron transport is of fundamental importance for a deeper understanding of the underlying physical processes in quantum transport in nanoscale devices. The backaction effect from a detector on the nanoscale devices is also essential due to its inevitable presence in experiments. Here we investigate the backaction of a charge detector in the form of a quantum point contact (QPC) on the counting statistics of a biased double quantum dot (DQD). We show that this inevitable QPC-induced backaction can have profound effects on the counting statistics under certain conditions, e.g., changing the shot noise from being sub-Poissonian to super-Poissonian, and changing the skewness from being positive to negative. Also, we show that both Fano factor and skewness can be either enhanced or suppressed by increasing the energy difference between two single-dot levels of the DQD under the detector-induced backaction.

14 pages, 5 figures; comments are welcome

References in corpus (16)

• Universal oscillations in counting statistics
• Counting Statistics of Non-Markovian Quantum Stochastic Processes
• Full counting statistics of super-Poissonian shot noise in multi-level quantum dots
• Frequency-selective single photon detection using a double quantum dot
• Measurement of finite-frequency current statistics in a single-electron transistor
• Full counting statistics of nano-electromechanical systems
• Noise enhancement due to quantum coherence in coupled quantum dots
• Conditional statistics of electron transport in interacting nanoscale conductors
• Characterizing correlations with full counting statistics: classical Ising and quantum XY spin chains
• Distinguishing quantum and classical transport through nanostructures
• High-order cumulants in the counting statistics of asymmetric quantum dots
• Counting statistics in an InAs nanowire quantum dot with a vertically coupled charge detector
• The influence of charge detection on counting statistics
• Improved position measurement of nano electromechanical systems using cross correlations
• Probing the quantum behaviors of a nanomechanical resonator coupled to a double quantum dot
• Back-action Induced Non-equilibrium Effect in Electron Charge Counting Statistics

Cited by in corpus (11)

• Quantum feedback: theory, experiments, and applications
• Dephasing-assisted transport in linear triple quantum dots
• Double quantum dot coupled to a quantum point contact: A stochastic thermodynamics approach
• Quantum interference in transport through almost symmetric double quantum dots
• Stochastic feedback control of quantum transport to realize a dynamical ensemble of two nonorthogonal pure states
• Continuous microwave photon counting by semiconductor-superconductor hybrids
• Coherence of an Electronic Two-Level System under Continuous Charge Sensing by a Quantum Dot Detector
• Distinguishing coherent from incoherent charge transport in linear triple quantum dots
• Modelling and Control of Quantum Measurement Induced Backaction in Double Quantum Dots
• Bounds on skewness and kurtosis of steady state currents
• Triplet-assisted leakage during singlet-triplet qubit readout with a quantum point contact