Journal
PHYSICAL REVIEW B
Volume 94, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.161302
Keywords
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Funding
- Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology [CE110001027]
- U.S. Army Research Office [W911NF-13-1-0024]
- JSPS
- Grants-in-Aid for Scientific Research [26220602] Funding Source: KAKEN
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We investigate the dynamics of a strongly driven microwave-dressed donor-bound electron spin qubit in silicon. A resonant oscillating magnetic field B-1 is used to dress the electron spin and create a new quantum system with a level splitting proportional to B-1. The dressed two-level system can then be driven by modulating the detuning Lambda nu between the microwave source frequency. MW and the electron spin transition frequency nu(e) at the frequency of the level splitting. The resulting dressed qubit Rabi frequency Omega(R rho) is defined by the modulation amplitude, which can be made comparable to the level splitting using frequency modulation on the microwave source. This allows us to investigate the regime where the rotating wave approximation breaks down without requiring microwave power levels that would be incompatible with a cryogenic environment. We observe clear deviations from normal Rabi oscillations and can numerically simulate the time evolution of the states in excellent agreement with the experimental data.
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