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Title: Microwave-driven coherent operation of a semiconductor quantum dot charge qubit

Journal Article · · Nature Nanotechnology

An intuitive realization of a qubit is an electron charge at two well-defined positions of a double quantum dot. The qubit is simple and has the potential for high-speed operation because of its strong coupling to electric fields. But, charge noise also couples strongly to this qubit, resulting in rapid dephasing at all but one special operating point called the ‘sweet spot’. In previous studies d.c. voltage pulses have been used to manipulate semiconductor charge qubits but did not achieve high-fidelity control, because d.c. gating requires excursions away from the sweet spot. Here, by using resonant a.c. microwave driving we achieve fast (greater than gigahertz) and universal single qubit rotations of a semiconductor charge qubit. The Z-axis rotations of the qubit are well protected at the sweet spot, and we demonstrate the same protection for rotations about arbitrary axes in the X–Y plane of the qubit Bloch sphere. We characterize the qubit operation using two tomographic approaches: standard process tomography and gate set tomography. Moreover, both methods consistently yield process fidelities greater than 86% with respect to a universal set of unitary single-qubit operations.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1182978
Report Number(s):
SAND-2014-15683J; 533644
Journal Information:
Nature Nanotechnology, Vol. 10, Issue 3; ISSN 1748-3387
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 95 works
Citation information provided by
Web of Science

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Cited By (41)

Suppression of Leakage for a Charge Qubit in Triangular Triple Quantum Dots journal October 2019
Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography journal February 2017
A decoherence-free subspace in a charge quadrupole qubit journal June 2017
Conditional rotation of two strongly coupled semiconductor charge qubits journal July 2015
High-fidelity resonant gating of a silicon-based quantum dot hybrid qubit journal October 2015
State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot journal October 2016
Silicon quantum processor with robust long-distance qubit couplings journal September 2017
Extending the coherence of a quantum dot hybrid qubit journal August 2017
Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise journal November 2018
Achieving high-fidelity single-qubit gates in a strongly driven charge qubit with 1/f charge noise journal January 2019
Adiabatic two-qubit gates in capacitively coupled quantum dot hybrid qubits journal September 2019
Picosecond coherent electron motion in a silicon single-electron source journal November 2019
Superconductor–semiconductor hybrid-circuit quantum electrodynamics journal January 2020
Fast raster scan multiplexed charge stability measurements toward high-throughput quantum dot array calibration journal June 2019
Semiconductor quantum computation journal December 2018
High-fidelity single-qubit gates in a strongly driven quantum-dot hybrid qubit with 1 / f charge noise journal August 2019
High-fidelity entangling gates for quantum-dot hybrid qubits based on exchange interactions journal January 2020
Achieving high-fidelity single-qubit gates in a strongly driven silicon-quantum-dot hybrid qubit journal June 2017
Measurements of Capacitive Coupling Within a Quadruple-Quantum-Dot Array journal December 2019
Electric-field control and noise protection of the flopping-mode spin qubit journal September 2019
Quantum and tunneling capacitance in charge and spin qubits journal January 2017
Pulse sequences for suppressing leakage in single-qubit gate operations journal June 2017
Charge reconfiguration in arrays of quantum dots journal December 2017
Flopping-mode electric dipole spin resonance journal January 2020
Oxides: An answer to the qubit problem? journal June 2019
Charge reconfiguration in arrays of quantum dots other January 2017
High fidelity resonant gating of a silicon based quantum dot hybrid qubit text January 2015
Silicon quantum processor with robust long-distance qubit couplings text January 2015
Tunable Hybrid Qubit in a GaAs Double Quantum Dot text January 2015
Quantum and Tunnelling Capacitance in Charge and Spin Qubits text January 2016
Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography text January 2016
Breaking the rotating wave approximation for a strongly-driven, dressed, single electron spin text January 2016
Pulse sequences for suppressing leakage in single-qubit gate operations text January 2016
Achieving High Fidelity Single Qubit Gates in a Strongly Driven Silicon Quantum Dot Hybrid Qubit text January 2017
Achieving High-Fidelity Single-Qubit Gates in a Strongly Driven Charge Qubit with $1\!/\!f$ Charge Noise text January 2018
Picosecond coherent electron motion in a silicon single-electron source text January 2019
Electric-field control and noise protection of the flopping-mode spin qubit text January 2019
Flopping-mode electric dipole spin resonance text January 2019
Superconductor-semiconductor hybrid cavity quantum electrodynamics text January 2019
High-Fidelity Entangling Gates for Quantum-Dot Hybrid Qubits Based on Exchange Interactions text January 2019
Temperature dependence of long coherence times of oxide charge qubits preprint January 2016

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