Protecting backaction-evading measurements from parametric instability

Journal Article · Thu Aug 17 00:00:00 EDT 2023 · TBD

OSTI ID:2000974

Ruddy, E. P. ^[1]; Jiang, Y. ^[1]; Frattini, N. E. ^[1]; Quinlan, K. O. ^[1]; Lehnert, K. W. ^[1]

---

1. JILA, Boulder; Colorado U.

Noiseless measurement of a single quadrature in systems of parametrically coupled oscillators is theoretically possible by pumping at the sum and difference frequencies of the two oscillators, realizing a backaction-evading (BAE) scheme. Although this would hold true in the simplest scenario for a system with pure three-wave mixing, implementations of this scheme are hindered by unwanted higher-order parametric processes that destabilize the system and add noise. We show analytically that detuning the two pumps from the sum and difference frequencies can stabilize the system and fully recover the BAE performance, enabling operation at otherwise inaccessible cooperativities. We also show that the acceleration demonstrated in a weak signal detection experiment [PRX QUANTUM 4, 020302 (2023)] was only achievable because of this detuning technique.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2000974
• Report Number(s): FERMILAB-PUB-23-499-V; arXiv:2308.09168; oai:inspirehep.net:2689408
• Journal Information: TBD, Journal Name: TBD
• Country of Publication: United States
• Language: English