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Träfflista för sökning "WFRF:(Keyser Ailsa K.V.) "

Search: WFRF:(Keyser Ailsa K.V.)

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  • Keyser, Ailsa K.V., et al. (author)
  • Pulsed electron spin resonance of an organic microcrystal by dispersive readout
  • 2020
  • In: Journal of Magnetic Resonance. - : Elsevier BV. - 1090-7807 .- 1096-0856. ; 321
  • Journal article (peer-reviewed)abstract
    • We establish a testbed system for the development of high-sensitivity Electron Spin Resonance (ESR) techniques for small samples at cryogenic temperatures. Our system consists of a NbN thin-film planar superconducting microresonator designed to have a concentrated mode volume to couple to a small amount of paramagnetic material, and to be resilient to magnetic fields of up to 400mT. At 65mK we measure high-cooperativity coupling (C≈19) to an organic radical microcrystal containing 1012 spins in a pico-litre volume. We detect the spin–lattice decoherence rate via the dispersive frequency shift of the resonator. Techniques such as these could be suitable for applications in quantum information as well as for pulsed ESR interrogation of very few spins to provide insights into the surface chemistry of, for example, the material defects in superconducting quantum processors.
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2.
  • Ranjan, V., et al. (author)
  • Spin-Echo Silencing Using a Current-Biased Frequency-Tunable Resonator
  • 2022
  • In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 129:18
  • Journal article (peer-reviewed)abstract
    • The ability to control microwave emission from a spin ensemble is a requirement of several quantum memory protocols. Here, we demonstrate such ability by using a resonator whose frequency can be rapidly tuned with a bias current. We store excitations in an ensemble of rare-earth ions and suppress on demand the echo emission ("echo silencing") by two methods: (1) detuning the resonator during the spin rephasing, and (2) subjecting spins to magnetic field gradients generated by the bias current itself. We also show that spin coherence is preserved during silencing.
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