Randomized benchmarking of barrier versus tilt control of a singlet-triplet qubit

Abstract

Decoherence due to charge noise is one of the central challenges in using spin qubits in semiconductor quantum dots as a platform for quantum information processing. Recently, it has been experimentally demonstrated in both Si and GaAs singlet-triplet qubits that the effects of charge noise can be suppressed if qubit operations are implemented using symmetric barrier control instead of the standard tilt control. Here, we investigate the key issue of whether the benefits of barrier control persist over the entire set of single-qubit gates by performing randomized benchmarking simulations. We find the surprising result that the improvement afforded by barrier control depends sensitively on the amount of spin noise: for the minimal nuclear spin noise levels present in Si, the coherence time improves by more than two orders of magnitude whereas in GaAs, by contrast the coherence time is essentially the same for barrier and tilt control. However, we establish that barrier control becomes beneficial if qubit operations are performed using a new family of composite pulses that reduce gate times by up to 90%. With these optimized pulses, barrier control is the best way to achieve high-fidelity quantum gates in singlet-triplet qubits.

arXiv comment4+6 pages

References in corpus (39)

• Quantum Computation with Quantum Dots
• Spins in few-electron quantum dots
• Silicon Quantum Electronics
• Randomized Benchmarking of Quantum Gates
• An addressable quantum dot qubit with fault-tolerant control fidelity
• Universal Quantum Computation with the Exchange Interaction
• A single-atom electron spin qubit in silicon
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• High-fidelity readout and control of a nuclear spin qubit in silicon
• Characterizing Quantum Gates via Randomized Benchmarking
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Reduced sensitivity to charge noise in semiconductor spin qubits via symmetric operation
• Quantum control and process tomography of a semiconductor quantum dot hybrid qubit
• 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
• Self-Consistent Measurement and State Tomography of an Exchange-Only Spin Qubit
• The Resonant Exchange Qubit
• A fast "hybrid" silicon double quantum dot qubit
• Suppressing qubit dephasing using real-time Hamiltonian estimation
• Scaling of Dynamical Decoupling for Spin Qubits
• Charge fluctuation induced dephasing of exchange coupled spin qubits
• Two-axis control of a singlet-triplet qubit with an integrated micromagnet
• Fidelity of Single Qubit Maps
• Long-range coherent coupling in a quantum dot array
• Notch filtering the nuclear environment of a spin qubit
• Robust quantum gates for singlet-triplet spin qubits using composite pulses
• High fidelity resonant gating of a silicon based quantum dot hybrid qubit
• Conditional operation of a spin qubit
• Quantum manipulation of two-electron spin states in metastable double quantum dots
• Charge-noise-insensitive gate operations for always-on, exchange-only qubits
• Detection and control of charge states in a quintuple quantum dot
• Nuclear Spin Dynamics in Double Quantum Dots: Fixed Points, Transients, and Intermittency
• Filter function formalism beyond pure dephasing and non-Markovian noise in singlet-triplet qubits
• Electrically controlled quantum gates for two-spin qubits in two double quantum dots
• Single-electron Spin Resonance in a Quadruple Quantum Dot
• Noise filtering of composite pulses for singlet-triplet qubits
• Environmental noise effects on entanglement fidelity of exchange-coupled semiconductor spin qubits

Cited by in corpus (27)

• Computing with spin qubits at the surface code error threshold
• High-fidelity quantum gates in Si/SiGe double quantum dots
• Neural-network-designed pulse sequences for robust control of singlet-triplet qubits
• Ultrahigh-fidelity composite rotational quantum gates
• Fast high-fidelity entangling gates for spin qubits in Si double quantum dots
• High-fidelity quantum control by polychromatic pulse trains
• Narrowband and passband composite pulses for variable rotations
• Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise
• Composite pulses with errant phases
• Universal Composite Pulses for Efficient Population Inversion with an Arbitrary Excitation Profile
• Fast pulse sequences for dynamically corrected gates in single-triplet qubits
• Negative exchange interactions in coupled few-electron quantum dots
• High-fidelity composite quantum gates for Raman qubits
• Theory of barrier vs tilt exchange gate operations in spin-based quantum computing
• Suppression of charge noise using barrier control of a singlet-triplet qubit
• Decoherence of two coupled singlet-triplet spin qubits
• Fast high-fidelity geometric gates for singlet-triplet qubits
• Optimizing nonadiabatic geometric quantum gates against off-resonance error by dynamical correction in a silicon-based spin qubit
• Tunable charge qubit based on barrier-controlled triple quantum dots
• Magic angle for barrier-controlled double quantum dots
• Ultrahigh-fidelity composite quantum phase gates
• Spin-qubit noise spectroscopy from randomized benchmarking by supervised learning
• On the robustness of the hybrid qubit computational gates through simulated randomized benchmarking protocols
• Minimal Non-orthogonal Gate Decomposition for Qubits with Limited Control
• Universal singlet-triplet qubits implemented near the transverse sweet spot
• Ultrabroadband, ultranarrowband and ultrapassband composite polarisation half-wave plates, ultrabroadband composite polarisation pi-rotators and on the quantum-classical analogy
• Enhanced local addressability of a spin array with local exchange pulses and global microwave driving