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In situ amplification of spin echoes within a kinetic inductance parametric amplifier

Journal Article · · Science Advances
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [1];  [1]
  1. Univ. of New South Wales, Sydney, NSW (Australia)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Univ. of Copenhagen (Denmark)
  4. Univ. of Melbourne, VIC (Australia)
  5. Royal Melbourne Institute of Technology, VIC (Australia)
The use of superconducting microresonators together with quantum-limited Josephson parametric amplifiers has enhanced the sensitivity of pulsed electron spin resonance (ESR) measurements by more than four orders of magnitude. So far, the microwave resonators and amplifiers have been designed as separate components due to the incompatibility of Josephson junction–based devices with magnetic fields. This has produced complex spectrometers and raised technical barriers toward adoption of the technique. Here, we circumvent this issue by coupling an ensemble of spins directly to a weakly nonlinear and magnetic field–resilient superconducting microwave resonator. We perform pulsed ESR measurements with a 1-pL mode volume containing 6 × 107 spins and amplify the resulting signals within the device. When considering only those spins that contribute to the detected signals, we find a sensitivity of 2.8 x 103 spins / $$\sqrt{Hz}$$ for a Hahn echo sequence at a temperature of 400 mK. In situ amplification is demonstrated at fields up to 254 mT, highlighting the technique’s potential for application under conventional ESR operating conditions.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2470675
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 10 Vol. 9; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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