Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99%
Kenta Takeda (RIKEN Center for Emergent Matter Science (CEMS))
Akito Noiri (RIKEN Center for Emergent Matter Science (CEMS))
Takashi Nakajima (RIKEN Center for Emergent Matter Science (CEMS))
Leon C. Camenzind (RIKEN Center for Emergent Matter Science (CEMS))
Takashi Kobayashi (RIKEN Center for Quantum Computing (RQC), Wako)
Amir Sammak (TU Delft - QuTech Advanced Research Centre, TNO, TU Delft - BUS/TNO STAFF)
Giordano Scappucci (TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Seigo Tarucha (RIKEN Center for Emergent Matter Science (CEMS), RIKEN Center for Quantum Computing (RQC), Wako)
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Abstract
Silicon-based spin qubits offer a potential pathway toward realizing a scalable quantum computer owing to their compatibility with semiconductor manufacturing technologies. Recent experiments in this system have demonstrated crucial technologies, including high-fidelity quantum gates and multiqubit operation. However, the realization of a fault-tolerant quantum computer requires a high-fidelity spin measurement faster than decoherence. To address this challenge, we characterize and optimize the initialization and measurement procedures using the parity-mode Pauli spin blockade technique. Here, we demonstrate a rapid (with a duration of a few μs) and accurate (with >99% fidelity) parity spin measurement in a silicon double quantum dot. These results represent a significant step forward toward implementing measurement-based quantum error correction in silicon.
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