期刊
PHYSICAL REVIEW B
卷 97, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.085421
关键词
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资金
- Army Research Office [W911NF-15-1-0149]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4535]
- NSF Grant [DMR-1409556]
- NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center [DMR-1420541]
Motivated by recent experiments of Zajac et al. [Science 359, 439 (2018)], we theoretically describe high-fidelity two-qubit gates using the exchange interaction between the spins in neighboring quantum dots subject to a magnetic field gradient. We use a combination of analytical calculations and numerical simulations to provide the optimal pulse sequences and parameter settings for the gate operation. We present a synchronization method which avoids detrimental spin flips during the gate operation and provide details about phase mismatches accumulated during the two-qubit gates which occur due to residual exchange interaction, nonadiabatic pulses, and off-resonant driving. By adjusting the gate times, synchronizing the resonant and off-resonant transitions, and compensating these phase mismatches by phase control, the overall gate fidelity can be increased significantly.
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