期刊
PRX QUANTUM
卷 3, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PRXQuantum.3.020352
关键词
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资金
- Ramon y Cajal program [RYC-2016-20066]
- CAM/FEDER Project [S2018/TCS-4342]
- Plan Nacional Generacion de Conocimiento [PGC2018-095862B-C22]
- UKRI Science and Technology Facilities Council (STFC) [ST/T000813/1]
- ERC [804247]
- EU [820495]
- Grant IFT Centro de Excelencia Severo Ochoa - MCIN/AEI [CEX2020-001007-S]
- CSIC Research Platform on Quantum Technologies [PTI-001]
- European Research Council (ERC) [804247] Funding Source: European Research Council (ERC)
In this work, we study the generating functional of a self-interacting scalar quantum field theory and map it onto a collection of multipartite-entangled two-level sensors via an interferometric protocol. We show that using always-on harmonic sources can simplify the sensing protocol and allow for the extraction of relevant information about the renormalization of the quantum field theory.
The generating functional of a self-interacting scalar quantum field theory (QFT), which contains all the relevant information about real-time dynamics and scattering experiments, can be mapped onto a collection of multipartite-entangled two-level sensors via an interferometric protocol that exploits a specific set of source functions. Although one typically focuses on impulsive delta-like sources, as these give direct access to n-point Feynman propagators, we show in this work that using always-on harmonic sources can simplify substantially the sensing protocol. In a specific regime, the effective real-time dynamics of the quantum sensors can be described by a quantum Ising model with long-range couplings, the range and strength of which contains all the relevant information about the renormalization of the QFT, which can now be extracted in the absence of multipartite entanglement. We present a detailed analysis of how this sensing protocol can be relevant to characterize the long-wavelength QFT that describes quantized sound waves of trapped-ion crystals in the vicinity of a structural phase transition, opening a new route to characterize the associated renormalization of sound.
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