| Autor: |
Martín-Vázquez, G., Aarts, G., Müller, M., Bermudez, A. |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
PRX Quantum 3, 020352, 2022 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PRXQuantum.3.020352 |
| Popis: |
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 renormalisation of the QFT, which can now be extracted in the absence of multi-partite entanglement. We present a detailed analysis of how this sensing protocol can be relevant to characterise the long-wavelength QFT that describes quantised sound waves of trapped-ion crystals in the vicinity of a structural phase transition, opening a new route to characterise the associated renormalisation of sound. |
| Databáze: |
arXiv |
| Externí odkaz: |
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