Electron Spin Resonance at the Level of 104 Spins Using Low Impedance Superconducting Resonators
C. Eichler, A. J. Sigillito, S. A. Lyon, J. R. Petta
DOI 10.1103/PhysRevLett.118.037701 · Physical Review Letters
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Abstract
We report on electron spin resonance measurements of phosphorus donors localized in a 200 μm2 area below the inductive wire of a lumped element superconducting resonator. By combining quantum limited parametric amplification with a low impedance microwave resonator design, we are able to detect around 2×104 spins with a signal-to-noise ratio of 1 in a single shot. The 150 Hz coupling strength between the resonator field and individual spins is significantly larger than the 1–10 Hz coupling rates obtained with typical coplanar waveguide resonator designs. Because of the larger coupling rate, we find that spin relaxation is dominated by radiative decay into the resonator and dependent upon the spin-resonator detuning, as predicted by Purcell.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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