Towards coupling Bismuth Dopant Spins in Silicon to Superconducting Resonators at 'Clock Transitions'
Abstract
Spins in nuclear-spin-free solid state systems such as purified 28Si have seen extensive research as candidates for quantum information storage and processing, thanks to their long spin coherence lifetimes. Strongly coupling such spins to a high Q superconducting resonator provides a route to develop microwave quantum memories. Bismuth donor spins can be tuned to so-called "clock transitions', which, due to their insensitivity to magnetic field noise, can have electron spin coherence times as long as 3 seconds. Achieving coupling to such transitions requires resonators which are both magnetic-field resilient, and frequency tuneable. We use a superconducting NbN microwave resonator which maintains a high Q-factor up to fields of 700mT. Resonators may be frequency-tuned by changing the orientation of the applied field, thereby changing the kinetic inductance of the superconducting film. In this way we can tune a resonator into resonance with the bismuth donor spins precisely at a clock transition.
Funding from EPSRC through a DTG, EP/N015118/1 (QUES2T) and EP/K025945/1 (UNDEDD), and from EC Horizon 2020 through 279781 (ASCENT).- Publication:
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APS March Meeting Abstracts
- Pub Date:
- 2018
- Bibcode:
- 2018APS..MARR11010O