Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Y71: Improving Qubit Readout with Parametric Amplifiers
8:00 AM–10:48 AM,
Friday, March 10, 2023
Room: Room 407/408
Sponsoring
Unit:
DQI
Chair: Ted Thorbeck, IBM Quantum
Abstract: Y71.00002 : Perfect phase matching via a non-local pump in topological Josephson traveling-wave parametric amplifiers
8:12 AM–8:24 AM
Presenter:
Tomas Ramos
(IFF-CSIC, Madrid)
Authors:
Tomas Ramos
(IFF-CSIC, Madrid)
Álvaro Gómez-León
(IFF-CSIC, Madrid)
Juan Jose Garcia-Ripoll
(Instituto de Fisica Fundamental)
Alejandro Gonzalez-Tudela
(Instituto de Física Fundamental-CSIC)
Diego Porras
(Consejo Superior de Investigaciones Cien)
Moreover, the phase of the non-local pump breaks time-reserval symmetry, allowing the device to enter a topological amplifying steady-state phase [1,2]. In this regime, microwave signals are unidirectionally amplified along the JJ array with all back-reflections and backward noise exponentially suppressed. Moreover, due to the topological origin of the directional amplification, the gain grows exponentially with system size, and it is robust to large amounts of disorder. We characterize the performance of the topological JTWPA using state-of-the-art superconducting circuit parameters, showing that a compact device with N~30 sites is enough to surpass 30 dB of near quantum-limited amplification and -30 dB of isolation over a bandwidth of a GHz [1]. Our work opens the door to the scalable integration of the quantum processors with compact, directional, and broadband pre-amplifiers on the same chip.
References:
[1] T. Ramos, A. Gómez-León, J.J. García-Ripoll, A. González-Tudela, D. Porras, “Directional Josephson traveling-wave parametric amplifier via non-Hermitian topology”, arXiv:2207.13728.
[2] A. Gómez-León, T. Ramos, A. González-Tudela, D. Porras, “Non-Hermitian topological phases in traveling-wave parametric amplifiers”, arXiv:2207.13715.
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