Compare Papers
Paper 1
Coherent quantum phase slip in two-component bosonic atomtronic circuits
A Gallemí, A Muñoz Mateo, R Mayol, M Guilleumas
- Year
- 2015
- Journal
- New Journal of Physics
- DOI
- 10.1088/1367-2630/18/1/015003
- arXiv
- -
No abstract.
Open paperPaper 2
High-fidelity quantum gates in Si/SiGe double quantum dots
Maximilian Russ, D. M. Zajac, A. J. Sigillito, F. Borjans, J. M. Taylor, J. R. Petta, Guido Burkard
- Year
- 2017
- Journal
- arXiv preprint
- DOI
- arXiv:1711.00754
- arXiv
- 1711.00754
Motivated by recent experiments of Zajac et al. [arXiv:1708.03530], 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 novel 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, non-adiabatic 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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