Crosstalk analysis for single-qubit and two-qubit gates in spin qubit arrays

Abstract

Scaling up spin qubit systems requires high-fidelity single-qubit and two-qubit gates. Gate fidelities exceeding $98\%$ were already demonstrated in silicon based single and double quantum dots, whereas for the realization of larger qubit arrays crosstalk effects on neighboring qubits must be taken into account. We analyze qubit fidelities impacted by crosstalk when performing single-qubit and two-qubit operations on neighbor qubits with a simple Heisenberg model. Furthermore we propose conditions for driving fields to robustly synchronize Rabi oscillations and avoid crosstalk effects. In our analysis we also consider next to nearest neighbor crosstalk and show that double synchronization leads to a restricted choice for the driving field strength, exchange interaction, and thus gate time. Considering realistic experimental conditions we propose a set of parameter values to perform a nearly crosstalk-free CNOT gate and so open up the pathway to scalable quantum computing devices.

arXiv comment9 pages, 8 figures

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• Near-Term Spin-Qubit Architecture Design via Multipartite Maximally-Entangled States
• High-fidelity CNOT gate for spin qubits with asymmetric driving using virtual gates
• Neural-network-designed three-qubit gates robust against charge noise and crosstalk in silicon
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• Scalable Parity Architecture With a Shuttling-Based Spin Qubit Processor
• Quantum noise modeling through Reinforcement Learning
• Pursuing high-fidelity control of spin qubits in natural Si/SiGe quantum dot
• The resource cost of large scale quantum computing
• Effective tuning methods for few-electron regime in gate-defined quantum dots
• A SWAP Gate for Spin Qubits in Silicon
• Tomography-assisted noisy quantum circuit simulator using matrix product density operators
• Redundant string symmetry-based error correction: Demonstrations on quantum devices
• Noise cross-correlations from single-shot measurements
• Overcoming limitations on gate fidelity in noisy static exchange-coupled surface qubits
• Enhanced local addressability of a spin array with local exchange pulses and global microwave driving
• Suppression of coherent errors during entangling operations in NV centers in diamond