A Ku band pulsed electron paramagnetic resonance spectrometer using an arbitrary waveform generator for quantum control experiments at millikelvin temperatures

• Yap, Yung Szen

• Tabuchi, Yutaka

• Negoro, Makoto

• Kagawa, Akinori

• Kitagawa, Masahiro

Abstract

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yung Szen Yap, Yutaka Tabuchi, Makoto Negoro, Akinori Kagawa, and Masahiro Kitagawa, Review of Scientific Instruments 86, 063110 (2015) and may be found at https://doi.org/10.1063/1.4922791.

We present a 17 GHz (Ku band) arbitrary waveform pulsed electron paramagnetic resonance spectrometer for experiments down to millikelvin temperatures. The spectrometer is located at room temperature, while the resonator is placed either in a room temperature magnet or inside a cryogen-free dilution refrigerator; the operating temperature range of the dilution unit is from ca. 10 mK to 8 K. This combination provides the opportunity to perform quantum control experiments on electron spins in the pure-state regime. At 0.6 T, spin echo experiments were carried out using γ-irradiated quartz glass from 1 K to 12.3 mK. With decreasing temperatures, we observed an increase in spin echo signal intensities due to increasing spin polarizations, in accordance with theoretical predictions. Through experimental data fitting, thermal spin polarization at 100 mK was estimated to be at least 99%, which was almost pure state. Next, to demonstrate the ability to create arbitrary waveform pulses, we generate a shaped pulse by superposing three Gaussian pulses of different frequencies. The resulting pulse was able to selectively and coherently excite three different spin packets simultaneously - a useful ability for analyzing multi-spin system and for controlling a multi-qubit quantum computer. By applying this pulse to the inhomogeneously broadened sample, we obtain three well-resolved excitations at 8 K, 1 K, and 14 mK.

Journal

• Review of Scientific Instruments

  Review of Scientific Instruments 86 (6), 063110-, 2015-06-24

  AIP Publishing

Keywords

• Instrumentation

Details

• CRID: 1050862643878548224
• NII Article ID: 120006955559
• NII Book ID: AA00817730
• DOI: 10.1063/1.4922791
• ISSN: 10897623
• ISSN: 00346748
• HANDLE: 11094/77647
• Web Site: https://pubs.aip.org/aip/rsi/article-pdf/doi/10.1063/1.4922791/15791182/063110_1_online.pdf
• Text Lang: en
• Article Type: journal article
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