Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 6: Magnetic Instrumentation and Characterization

MA 6.8: Vortrag

Montag, 20. März 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.