Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot

2010/01/31 by C. Barthel, Christian Barthel, M. Kjaergaard +8 · 11 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Coulomb blockade #Electrical engineering #Electronic engineering #Optics #Optoelectronics #Physics #Quantum #Quantum and electron transport phenomena #Quantum computer #Quantum dot #Quantum dot laser #Quantum mechanics #Quantum network #Quantum point contact #Quantum sensor #Quantum well #Radio frequency #Reflectometry #Semiconductor #Semiconductor Quantum Structures and Devices #Sensitivity (control systems) #Spin (aerodynamics) #Transistor #Voltage #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.81.161308

published as Physical Review B 81 161308(R), 2010 · related papers at http://marcuslab.harvard.edu

openalex publication_date 2010/04/19 · arxiv created 2010/04/26 · arxiv updated 2010/04/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Single-shot measurement of the charge arrangement and spin state of a double quantum dot are reported with measurement times down to 100 ns. Sensing uses radio-frequency reflectometry of a proximal quantum dot in the Coulomb blockade regime. The sensor quantum dot is up to 30 times more sensitive than a comparable quantum point-contact sensor and yields three times greater signal to noise in rf single-shot measurements. Numerical modeling is qualitatively consistent with experiment and shows that the improved sensitivity of the sensor quantum dot results from reduced lifetime broadening and screening.

Citations

• Single-shot read-out of an individual electron spin in a quantum dot

Cited by

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• On-Chip Quantum-Dot Light Source for Quantum-Device Readout
• Signatures of Hyperfine, Spin-Orbit, and Decoherence Effects in a Pauli Spin Blockade
• Time-resolved charge detection in graphene quantum dots
• High-Fidelity Single-Qubit Gates for Two-Electron Spin Qubits in GaAs
• Charge Relaxation in a Single-ElectronSi/SiGeDouble Quantum Dot
• Qubit quantum-dot sensors: Noise cancellation by coherent backaction, initial slips, and elliptical precession
• Impact of Classical Control Electronics on Qubit Fidelity
• Suppressing quasiparticle poisoning with a voltage-controlled filter
• Photogeneration of a single electron from a single Zeeman-resolved light-hole exciton with preserved angular momentum
• Robust energy-selective tunneling readout of singlet-triplet qubits under large magnetic field gradient

Related

• Fast Single-Charge Sensing with an rf Quantum Point Contact
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