Multi-qubit gates protected by adiabaticity and dynamical decoupling applicable to donor qubits in silicon
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
In this study, we present a strategy for producing multiqubit gates that promise high fidelity with minimal tuning requirements. Our strategy combines gap protection from the adiabatic theorem with dynamical decoupling in a complementary manner. Energy-level transition errors are protected by adiabaticity and remaining phase errors are mitigated via dynamical decoupling. This is a powerful way to divide and conquer the various error channels. In order to accomplish this without violating a no-go theorem regarding black-box dynamically corrected gates [Phys. Rev. A 80, 032314 (2009)], we require a robust operating point (sweet spot) in control space where the qubits interact with little sensitivity to noise. There are also energy gap requirements for effective adiabaticity. We apply our strategy to an architecture in Si with P donors where we assume we can shuttle electrons between different donors. Electron spins act as mobile ancillary qubits and P nuclear spins act as long-lived data qubits. This system can have a very robust operating point where the electron spin is bound to a donor in the quadratic Stark shift regime. High fidelity single qubit gates may be performed using well-established global magnetic resonance pulse sequences. Single electron-spin preparation and measurement has also been demonstrated. Putting this all together, we present a robust universal gate set for quantum computation.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1184482
- Alternate ID(s):
- OSTI ID: 1212222; OSTI ID: 1237658
- Report Number(s):
- SAND-2014-18568J; SAND-2015-4490J; 540377
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 08; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Logical Qubit in a Linear Array of Semiconductor Quantum Dots
|
journal | June 2018 |
A Silicon Surface Code Architecture Resilient Against Leakage Errors
|
journal | December 2019 |
| High-fidelity quantum gates in Si/SiGe double quantum dots | text | January 2017 |
| A Silicon Surface Code Architecture Resilient Against Leakage Errors | text | January 2019 |
Similar Records
Engineering Dynamical Sweet Spots to Protect Qubits from 1/$f$ Noise
Silicon quantum processor with robust long-distance qubit couplings