2022
DOI: 10.1126/sciadv.abn5130
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Two-qubit silicon quantum processor with operation fidelity exceeding 99%

Abstract: Silicon spin qubits satisfy the necessary criteria for quantum information processing. However, a demonstration of high-fidelity state preparation and readout combined with high-fidelity single- and two-qubit gates, all of which must be present for quantum error correction, has been lacking. We use a two-qubit Si/SiGe quantum processor to demonstrate state preparation and readout with fidelity greater than 97%, combined with both single- and two-qubit control fidelities exceeding 99%. The operation of the quan… Show more

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Cited by 187 publications
(91 citation statements)
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“…However, if t R greatly exceeds the characteristic tunneling time t ↑ out then more thermal errors will occur, limiting F ↓ . In larger arrays with sequential readout steps, the readout time will also need to be balanced against T 1 decay in the subsequent qubits adding an additional constraint on t R and the tunneling rates [12].…”
Section: (B) γ ↑mentioning
confidence: 99%
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“…However, if t R greatly exceeds the characteristic tunneling time t ↑ out then more thermal errors will occur, limiting F ↓ . In larger arrays with sequential readout steps, the readout time will also need to be balanced against T 1 decay in the subsequent qubits adding an additional constraint on t R and the tunneling rates [12].…”
Section: (B) γ ↑mentioning
confidence: 99%
“…GST and IRB are implemented to demonstrate average single qubit gate fidelities exceeding 99.95% under the same operating conditions. Elzerman readout of larger LD spin qubit arrays [12,15,30,41] will require a reduction of the measurement time relative to the spin relaxation time. Furthermore, faster readout protocols will be necessary to fully unlock the potential of feedback-based error correction protocols [42].…”
Section: (B) γ ↑mentioning
confidence: 99%
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“…To this effect during the last decade, major experimental endeavors (see, e.g., Refs. [1][2][3][4][5][6][7]) have been undertaken and substantial progress has been reported. In particular, unprecedented progress has been achieved in the techniques for controlling and manipulating the spin and charge electronic degrees of freedom of two-dimensional (2D) semiconductor hybriddouble-quantum-dot (HDQD) qubits [8][9][10][11][12][13][14][15], comprising three-electron (3e) [8-10, 12, 13, 15] and five-electron (5e) [11,14] varieties.…”
Section: Introductionmentioning
confidence: 99%