Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 6: Magnetic Instrumentation and Characterization
MA 6.8: Talk
Monday, March 20, 2017, 11:15–11:30, HSZ 403
High sensitivity quantum limited electron spin resonance spectroscopy — •Sebastian Probst1, Philippe Campagne-Ibarcq1, Audrey Bienfait1, Jarryd J. Pla2, Denis Vion1, Daniel Esteve1, Klaus Moelmer3, John J. L. Morton4, and Patrice Bertet1 — 1Quantronics group, CEA Saclay, France — 2School of Electrical Engineering and Telecommunications, University of New South Wales, Australia — 3Department of Physics and Astronomy, Aarhus University, Denmark — 4London Centre for Nanotechnology, University College London, United Kingdom
Electron spin resonance (ESR) spectroscopy is widely employed for the detection and characterization of paramagnetic species and their magnetic and chemical environment. In a classical ESR spectrometer, the spins precess in an external magnetic field and emit small microwave signals into a cavity, which are amplified and measured. In this work, we make use of the toolbox of circuit quantum electrodynamics to boost the sensitivity of such a spectrometer by many orders of magnitude to the level of 102 spins/√Hz with a signal-to-noise ratio of 1. This is achieved by using a low impedance, high quality factor superconducting micro-resonator in conjunction with a Josephson parametric amplifier operated below 20 mK. The energy relaxation time T1 of the spins (Bi donors in 28Si) is limited by the Purcell effect to 21 ms allowing fast repetitive measurements while the coherence time T2 is approximately 1.7 ms. This work is a step towards inductive detection of individual spins, which would be beneficial for quantum information processing and chemical analysis of materials at the single spin level.