Quantum-enhanced time-domain spectroscopy

Dionysis Adamou, Lennart Hirsch, Taylor Shields, Seungjin Yoon, Adetunmise C Dada, Jonathan M R Weaver, Daniele Faccio, Marco Peccianti, Lucia Caspani, Matteo Clerici*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The time-resolved detection of mid- to far-infrared electric fields absorbed and emitted by molecules is among the most sensitive spectroscopic approaches and has the potential to transform sensing in fields such as security screening, quality control, and medical diagnostics. However, the sensitivity of the standard detection approach, which relies on encoding the far-infrared electric field into amplitude modulation of a visible or near-infrared probe laser pulse, is limited by the shot noise of the latter. This constraint cannot be overcome without using a quantum resource. Here, we show that this constraint can be overcome using a two-mode squeezed state. Quantum-correlated ultrashort pulses, generated by parametric down-conversion, enhance the sensitivity of far-infrared detection beyond the classical limit, achieving a twofold reduction in measured noise. This advancement paves the way for further development of ultrafast quantum metrology, moving toward quantum-enhanced time-resolved electric field spectroscopy with sensitivities beyond the standard quantum limit.
Original languageEnglish
Article numbereadt2187
Number of pages7
JournalScience Advances
Volume11
Issue number4
DOIs
Publication statusPublished - 24 Jan 2025

Keywords

  • infrared electric fields
  • ultrafast quantum metrology
  • electric field spectroscopy

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