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Paper 1

Manarat: A scalable QICK-based control system for superconducting quantum processors supporting synchronized control of 10 flux-tunable qubits.

Silva A, Orgaz Fuertes A.

Year

2026

Journal

Rev Sci Instrum

DOI

10.1063/5.0301360

arXiv

-

No abstract.

Open paper

Paper 2

Low-noise Balanced Homodyne Detection with Superconducting Nanowire Single-Photon Detectors

Maximilian Protte, Timon Schapeler, Jan Sperling, Tim J. Bartley

Year

2023

Journal

arXiv preprint

DOI

arXiv:2307.16672

arXiv

2307.16672

Superconducting nanowire single-photon detectors (SNSPDs) have been widely used to study the discrete nature of quantum states of light in the form of photon-counting experiments. We show that SNSPDs can also be used to study continuous variables of optical quantum states by performing homodyne detection at a bandwidth of $400~\mathrm{kHz}$. By measuring the interference of a continuous-wave field of a local oscillator with the field of the vacuum state using two SNSPDs, we show that the variance of the difference in count rates is linearly proportional to the photon flux of the local oscillator over almost five orders of magnitude. The resulting shot-noise clearance of $(46.0\pm1.1)~\mathrm{dB}$ is the highest reported clearance for a balanced optical homodyne detector, demonstrating their potential for measuring highly squeezed states in the continuous-wave regime. In addition, we measured a $\mathrm{CMRR}=22.4~\mathrm{dB}$. From the joint click counting statistics, we also measure the phase-dependent quadrature of a weak coherent state to demonstrate our device's functionality as a homodyne detector.

Open paper