Bismuth in silicon qubits: the role of EPR cancellation resonances

Details Bismuth in silicon qubits: the role of EPR cancellation resonances Bismuth in silicon qubits: the role of EPR cancellation resonances

2010-04-20

arxiv.org/abs/1004.3475v3

Phys. Rev. Lett. 105, 067602 (2010)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.105.067602

We investigate theoretically and experimentally the electron paramagnetic resonance (EPR) spectra of bismuth doped silicon (Si:Bi) at intermediate magnetic fields, $B \approx 0.05 -0.6$ T. We identify a previously unexplored EPR regime of "cancellation-resonances"- where part of the hyperfine coupling is resonant with the external field-induced splitting. We show this regime has interesting and experimentally accessible consequences for spectroscopy and quantum information applications. These include reduction of decoherence, fast manipulation of the coupled nuclear-electron qubit system and line narrowing in the multi-qubit case. We test our theoretical analysis by comparing with experimental X-band (9.7 GHz) EPR spectra obtained in the intermediate field regime.

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