Design of deeply cooled ultra-low dissipation amplifier and measuring cell for quantum measurements with a microwave single-photon counter
O. G. Turutanov, A. M. Korolev, V. I. Shnyrkov, A. P. Shapovalov, M., Bar\'anek, S. Kern, V. Yu. Lyakhno, P. Neilinger, M. Grajcar
TL;DR
This paper presents the design of a deeply cooled, ultra-low dissipation amplifier and measuring cell tailored for quantum measurements at millikelvin temperatures, enabling precise microwave single-photon detection.
Contribution
It introduces a novel low-back-action amplifier and measuring cell optimized for quantum measurements at 10 mK, with specific focus on low dissipation and high gain.
Findings
Amplifier achieves 15 dB gain at 450 MHz
Transistors dissipate only 1 microwatt of power
Design supports high-impedance signal sources
Abstract
The requirements and details of designing a measuring cell and low-back-action deeply-cooled amplifier for quantum measurements at 10 mK are discussed. This equipment is a part of a microwave single-photon counter based on a superconducting flux qubit. The high electron mobility transistors (HEMTs) in the amplifier operate in unsaturated microcurrent regime and dissipate only 1 microwatt of dc power per transistor. Simulated amplifier gain is 15 dB at 450 MHz with a high-impedance (~5 kOhm signal source and standard 50-Ohm output.
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Taxonomy
TopicsQuantum Information and Cryptography · Atomic and Subatomic Physics Research · Mechanical and Optical Resonators