Digital Homodyne and Heterodyne Detection for Stationary Bosonic Modes

Ingrid Strandberg; Axel M. Eriksson; Baptiste Royer; Mikael Kervinen; Simone Gasparinetti

doi:10.1103/PhysRevLett.133.063601

Digital Homodyne and Heterodyne Detection for Stationary Bosonic Modes

Ingrid Strandberg, Axel M. Eriksson, Baptiste Royer, Mikael Kervinen, Simone Gasparinetti

BA6208 Quantum computing hardware

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Abstract

Homo- and heterodyne detection are fundamental techniques for measuring propagating electromagnetic fields. However, applying these techniques to stationary fields confined in cavities poses a challenge. As a way to overcome this challenge, we propose to use repeated indirect measurements of a two-level system interacting with the cavity. We demonstrate numerically that the proposed measurement scheme faithfully reproduces measurement statistics of homo- or heterodyne detection. The scheme can be implemented in various physical architectures, including circuit quantum electrodynamics. Our results pave the way for implementation of quantum algorithms requiring linear detection of stationary modes, including quantum verification protocols.

Original language	English
Article number	063601
Journal	Physical Review Letters
Volume	133
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.133.063601
Publication status	Published - 9 Aug 2024
MoE publication type	A1 Journal article-refereed

Funding

S.\u2009G. is thankful to Giulia Ferrini, Alessandro Ferraro, and Ulysse Chabaud for useful discussions that initiated this work. I.\u2009S. gives thanks to Maryam Khanahmadi for important insights regarding the time-dependent coupling. Simulations were done using QuTiP . This work is supported by the Knut and Alice Wallenberg Foundation via the Wallenberg Centre for Quantum Technology (WACQT). I.\u2009S. acknowledges financial support from the European Union via Grant No. 101057977 SPECTRUM. A.\u2009E. and S.\u2009G. acknowledge funding from the European Union\u2019s Horizon Europe Framework Programme (EIC Pathfinder Challenge project Veriqub) under Grant Agreement No. 101114899. B.\u2009R. acknowledges funding from the Canada First Research Excellence Fund, the Natural Sciences and Engineering Research Council of Canada (NSERC) as well as the Fonds de Recherche du Qu\u00E9bec, Nature et Technologie (FRQNT).

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Digital Homodyne and Heterodyne Detection for Stationary Bosonic Modes

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