Squeezing-enhanced Raman spectroscopy
arXiv:1808.08572 · doi:10.1038/s41534-019-0197-0
Abstract
The sensitivity of classical Raman spectroscopy methods, such as Coherent Anti-Stokes Raman spectroscopy (CARS) or Stimulated Raman spectroscopy (SRS), is ultimately limited by shot-noise from the stimulating fields. We present the complete theoretical analysis of a squeezing-enhanced version of Raman spectroscopy that overcomes the shot-noise limit of sensitivity with enhancement of the Raman signal and inherent background suppression, while remaining fully compatible with standard Raman spectroscopy methods. By incorporating the Raman sample between two phase-sensitive parametric amplifiers that squeeze the light along orthogonal quadrature axes, the typical intensity measurement of the Raman response is converted into a quantum-limited, super-sensitive estimation of phase. The resonant Raman response in the sample induces a phase shift to signal-idler frequency-pairs within the fingerprint spectrum of the molecule, resulting in amplification of the resonant Raman signal by the squeezing factor of the parametric amplifiers, whereas the non-resonant background is annihilated by destructive interference. Seeding the interferometer with classical coherent light stimulates the Raman signal further without increasing the background, effectively forming squeezing-enhanced versions of CARS and SRS, where the quantum enhancement is achieved on top of the classical stimulation.
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- Magneto Optical Sensing beyond the Shot Noise Limit
- Driven quadrature and spin squeezing in a cavity-coupled ensemble of two-level states
- Enhancement in phase sensitivity in displacement-assisted SU(1,1) interferometer via photon recycling
- Recovery of Quantum Correlations using Machine Learning
- Mitigating scattering in a quantum system using only an integrating sphere
- Steady-state dynamics of quantum frequency combs in microring resonators
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