High-fidelity gate set for exchange-coupled singlet-triplet qubits

Abstract

In order to enable semiconductor-based quantum computing with many qubits, issues like residual interqubit coupling and constraints from scalable control hardware need to be tackled to retain the high gate fidelities demonstrated in current single-qubit devices. Here, we focus on two exchange-coupled singlet-triplet spin qubits, considering realistic control hardware as well as Coulomb and exchange coupling that cannot be fully turned off. Using measured noise spectra, we optimize realistic control pulses and show that two-qubit (single-qubit) gate fidelities of 99.90\% ($\ge 99.69\%$) can be reached in GaAs, while 99.99\% ($\ge 99.95\%$) can be achieved in Si.

arXiv comment11 pages, 10 figures, 6 tables. Reprinted with permission from Pascal Cerfontaine, René Otten, M. A. Wolfe, Patrick Bethke, and Hendrik Bluhm, Physical Review B 101, 155311 (2020). Copyright 2020 by the American Physical Society

References in corpus (36)

• Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing
• An addressable quantum dot qubit with fault-tolerant control fidelity
• A Two Qubit Logic Gate in Silicon
• State preservation by repetitive error detection in a superconducting quantum circuit
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• A programmable two-qubit quantum processor in silicon
• A simple formula for the average gate fidelity of a quantum dynamical operation
• Quantum CNOT Gate for Spins in Silicon
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
• Fidelity benchmarks for two-qubit gates in silicon
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Rapid Single-Shot Measurement of a Singlet-Triplet Qubit
• Reduced sensitivity to charge noise in semiconductor spin qubits via symmetric operation
• Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
• Noise suppression using symmetric exchange gates in spin qubits
• Unsupervised Machine Learning on a Hybrid Quantum Computer
• Two-axis control of a singlet-triplet qubit with an integrated micromagnet
• Procedures for Converting among Lindblad, Kraus and Matrix Representations of Quantum Dynamical Semigroups
• Assessment of a silicon quantum dot spin qubit environment via noise spectroscopy
• Measurement of Temporal Correlations of the Overhauser Field in a Double Quantum Dot
• Electrically Protected Valley-Orbit Qubits in Silicon
• Robust quantum gates for systems subject to decoherence via optimal control: Markovian vs non-Markovian dynamics
• Optimization of a solid-state electron spin qubit using Gate Set Tomography
• High-Fidelity Single-Qubit Gates for Two-Electron Spin Qubits in GaAs
• Exchange-based CNOT gates for singlet-triplet qubits with spin orbit interaction
• Tuning methods for semiconductor spin--qubits
• Exchange-based two-qubit gate for singlet-triplet qubits
• Controllable exchange coupling between two singlet-triplet qubits
• Two-Qubit Couplings of Singlet-Triplet Qubits Mediated by One Quantum State
• Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits
• Derivatives of spin dynamics simulations
• Transfer of a quantum state from a photonic qubit to a gate-defined quantum dot
• Self-Consistent Calibration of Quantum Gate Sets
• Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
• Feedback-tuned noise-resilient gates for encoded spin qubits

Cited by in corpus (20)

• Semiconductor Spin Qubits
• Computing with spin qubits at the surface code error threshold
• Closed-loop control of a GaAs-based singlet-triplet spin qubit with 99.5% gate fidelity and low leakage
• Universal control of four singlet-triplet qubits
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
• Real-time two-axis control of a spin qubit
• Self-Consistent Calibration of Quantum Gate Sets
• qopt: An experiment-oriented Qubit Simulation and Quantum Optimal Control Package
• Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically
• Studying many-body localization in exchange-coupled electron spin qubits using spin-spin correlations
• Towards a realistic GaAs-spin qubit device for a classical error-corrected quantum memory
• Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field
• The iSWAP gate with polar molecules: Robustness criteria for entangling operations
• Quantum optimal control in quantum technologies. Strategic report on current status, visions and goals for research in Europe
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Model validation and error attribution for a drifting qubit
• Robust iSWAP gates for semiconductor spin qubits with local driving
• Filter Function Formalism and Software Package to Compute Quantum Processes of Gate Sequences for Classical Non-Markovian Noise
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots