Bismuth in silicon qubits: the role of EPR cancellation resonances

Abstract

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.

References in corpus (4)

• Solid state quantum memory using the 31P nuclear spin
• Architecture for high-sensitivity single-shot readout and control of the electron spin of individual donors in silicon
• Long spin coherence in silicon with an electrical spin trap readout
• Optical Detection of a Single Nuclear Spin

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• Hyperfine Clock Transitions of Bismuth Donors in Silicon Detected by Spin Dependent Recombination
• Keeping a spin qubit alive in natural silicon: Comparing optimal working points and dynamical decoupling
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• Spin dependent recombination based magnetic resonance spectroscopy of bismuth donor spins in silicon at low magnetic fields
• Spatially-resolved decoherence of donor spins in silicon strained by a metallic electrode
• Long optical coherence times and coherent rare earth-magnon coupling in a rare earth doped anti-ferromagnet
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