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Josephson Microwave Sources Applied to Quantum Information Systems



Adam J. Sirois, Manuel C. Castellanos Beltran, Anna E. Fox, Samuel P. Benz, Peter F. Hopkins


Quantum computers with thousands or millions of qubits will require a scalable solution for qubit control and readout electronics. Colocating these electronics at millikelvin temperatures has been proposed and demonstrated, but there exist significant challenges with power dissipation, reproducibility, fidelity, and scalability. In this article, we experimentally demonstrate the use of a Josephson arbitrary waveform synthesizer (JAWS) to generate control signals at 4 K and perform spectroscopy of two components of a typical superconducting quantum information system: a linear resonator and a (nonlinear) transmon qubit. By locating the JAWS chip at 4 K and a qubit at 0.1 K, the direct path for quasi-particle poisoning from the JAWS chip to the qubit is broken. We demonstrate the stable, self-calibrated, and reproducible output signal of the JAWS when operated in its quantum locking range, a feature that allows these synthesizers to be replicated and scaled in the cryostat, all with identical on-chip, quantized, outputs. This is a proof-of-concept demonstration to generate signals at 4 K using driven superconducting electronics to control qubits at lower temperatures.
IEEE Transactions on Quantum Engineering


Quantum computers, qubit control, readout electronics, Josephson arbitrary waveform synthesizer, JAWS, control signals, spectroscopy, linear resonator, nonlinear transmon qubit, quasi-particle poisoning


Sirois, A. , Castellanos, M. , Fox, A. , Benz, S. and Hopkins, P. (2020), Josephson Microwave Sources Applied to Quantum Information Systems, IEEE Transactions on Quantum Engineering, [online], (Accessed June 21, 2024)


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Created December 17, 2020, Updated January 19, 2021