Control of Dephasing and Phonon Emission in Coupled Quantum Dots

Abstract

We predict that phonon subband quantization can be detected in the non-linear electron current through double quantum dot qubits embedded into nano-size semiconductor slabs, acting as phonon cavities. For particular values of the dot level splitting $\Delta$, piezo-electric or deformation potential scattering is either drastically reduced as compared to the bulk case, or strongly enhanced due to phonon van Hove singularities. By tuning $\Delta$ via gate voltages, one can either control dephasing, or strongly increase emission into phonon modes with characteristic angular distributions.

arXiv comment4 pages, 3 figures, accepted for publication as Rapid Comm. in Phys. Rev. B

References in corpus (9)

• Quantized thermal conductance of dielectric quantum wires
• Spontaneous Emission Spectrum in Double Quantum Dot Devices
• Double Quantum Dots as Detectors of High-Frequency Quantum Noise in Mesoscopic Conductors
• Time-dependent resonant tunneling via two discrete states
• Double-Occupancy Errors, Adiabaticity, and Entanglement of Spin-Qubits in Quantum Dots
• Spontaneous emission of phonons by coupled quantum dots
• Phonon Squeezed States Generated by Second Order Raman Scattering
• Charge transport through quantum dots via time-varying tunnel couplings
• Magnetotransport measurements on freely suspended two-dimensional electron gases

Cited by in corpus (24)

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• Decoherence Rate of Semiconductor Charge Qubit Coupled to Acoustic Phonon Reservoir
• Adiabatic Transfer of Electrons in Coupled Quantum Dots
• Reduction of Guided Acoustic Wave Brillouin Scattering in Photonic Crystal Fibers
• The role of phonons for exciton and biexciton generation in an optically driven quantum dot
• Steering of a Bosonic Mode with a Double Quantum Dot
• Dicke Effect in the Tunnel Current through two Double Quantum Dots
• Current detection of superradiance and induced entanglement of double quantum dot excitons
• Two-electron quantum dots as scalable qubits
• Dephasing in sequential tunneling through a double-dot interferometer
• Proposal for teleportation of charge qubits via superradiance
• Detecting non-Markovian plasmonic band gaps in quantum dots using electron transport
• Phonon distributions of a single bath mode coupled to a quantum dot
• Theory of phonon-mediated relaxation in doped quantum dot molecules
• Shock Waves in Nanomechanical Resonators
• Decoherence of charge states in double quantum dots due to cotunneling
• Spin relaxation in a GaAs quantum dot embedded inside a suspended phonon cavity
• Laterally defined freely suspended quantum dots in GaAs/AlGaAs heterostructures
• Heat capacity of suspended phonon cavities
• Steady-state solution for dark states using a three-level system in coupled quantum dots
• Unique Electron Spin Relaxation Induced by Confined Phonons in Nanowire-Based Quantum Dots
• Entropy Dynamics of Phonon Quantum States Generated by Optical Excitation of a Two-Level System
• Robustness of Charge-Qubit Cluster States to Double Quantum Point Contact Measurement