O'Sullivan, J;
Kennedy, OW;
Zollitsch, CW;
Šimėnas, M;
Thomas, CN;
Abdurakhimov, LV;
Withington, S;
(2020)
Spin-Resonance Linewidths of Bismuth Donors in Silicon Coupled to Planar Microresonators.
Physical Review Applied
, 14
(6)
, Article 064050. 10.1103/PhysRevApplied.14.064050.
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Abstract
Ensembles of bismuth-donor spins in silicon are promising storage elements for microwave quantum memories due to their long coherence times, which exceed seconds. The operation of an efficient quantum memory requires the achievement of critical coupling between the spin ensemble and a suitable high-quality factor resonator—this in turn requires a thorough understanding of the line shapes for the relevant spin-resonance transitions, particularly considering the influence of the resonator itself on line broadening. Here, we present pulsed electron-spin-resonance measurements of ensembles of bismuth donors in natural silicon, above which niobium superconducting resonators have been patterned. By studying spin transitions across a range of frequencies and fields, we identify distinct line-broadening mechanisms and, in particular, those that can be suppressed by operating at magnetic-field-insensitive “clock transitions.” Given the donor concentrations and resonator used here, we measure a cooperativity C ∼ 0.2 and based on our findings we discuss a route to achieve unit cooperativity, as required for a quantum memory.
| Type: | Article |
|---|---|
| Title: | Spin-Resonance Linewidths of Bismuth Donors in Silicon Coupled to Planar Microresonators |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevApplied.14.064050 |
| Publisher version: | https://doi.org/10.1103/PhysRevApplied.14.064050 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10118595 |
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