Noise-resilient driven exchange gate for quantum dot spin qubits
ORAL
Abstract
Spin qubits in silicon quantum dots are a promising candidate for high-fidelity quantum computation due to long decoherence times and fast operations.
Demonstrations of single qubit gates with fidelities up to 99.9% have been shown [1,2].
Recent demonstrations of two-qubit gates show fidelities of 92-98% [2,3]. These two-qubit gate implementations are not robust against low-frequency charge noise, which couples in via the exchange interaction, causing a limited fidelity. We propose a simple yet effective scheme that is resilient against low-frequency charge noise. We use a combination of analytic calculations and numerical simulations under realistic conditions to obtain estimated gate fidelities greater than 99%, which allow for fault-tolerant two qubit gates. We directly compare these realizations with existing proposals and will present our experimental efforts towards achieving this goal.
[1] Yoneda et al., Nat. Nanotechnol. 13, 102 (2018)
[2] Huang et al., Nature (London) 569, 532 (2019)
[3] Xu et al., Phys. Rev. X 9, 021011 (2019)
Demonstrations of single qubit gates with fidelities up to 99.9% have been shown [1,2].
Recent demonstrations of two-qubit gates show fidelities of 92-98% [2,3]. These two-qubit gate implementations are not robust against low-frequency charge noise, which couples in via the exchange interaction, causing a limited fidelity. We propose a simple yet effective scheme that is resilient against low-frequency charge noise. We use a combination of analytic calculations and numerical simulations under realistic conditions to obtain estimated gate fidelities greater than 99%, which allow for fault-tolerant two qubit gates. We directly compare these realizations with existing proposals and will present our experimental efforts towards achieving this goal.
[1] Yoneda et al., Nat. Nanotechnol. 13, 102 (2018)
[2] Huang et al., Nature (London) 569, 532 (2019)
[3] Xu et al., Phys. Rev. X 9, 021011 (2019)
*We acknowledge financial support from the Marie Sklodowska-Curie actions—Nanoscale solidstate spin systems in emerging quantum technologies—Spin-NANO, grant agreement number 676108 and from the European Research Council (ERC-Synergy).
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Presenters
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Stephan Philips
- Delft University of Technology