Photon-matter quantum correlations in spontaneous Raman scattering

Abstract

We develop a Hamiltonian formalism to study energy and position/momentum correlations between a single Stokes photon and a single material excitation that are created as a pair in the spontaneous Raman scattering process. Our approach allows for intuitive separation of the effects of spectral linewidth, chromatic dispersion, and collection angle on these correlations, and we compare the predictions of the model to experiment. These results have important implications for the use of Raman scattering in quantum protocols that rely on spectrally unentangled photons and collective excitations.

Measurement-induced collective vibrational quantum coherence under spontaneous Raman scattering in a liquid

“…Following a pioneering work by I. Walmsley and coworkers in 2011 11 , more recent experiments have used time-correlated single photon counting to evidence non-classical intensity correlations between light fields interacting with the same phonon mode via Raman scattering, with potential applications in ultrafast quantum information processing [12][13][14][15][16][17] , novel forms of spectroscopy 18,19 , and the generation of non-classical states of light 20 . These experimental results have spurred further theoretical developments to understand how the Raman process leads to photonic correlations mediated by a phononic excitation [21][22][23][24] , how the experimental geometry impacts the photon statistics of the Stokes field 25 , and how the coupling of a Raman-active mode to a nanocavity modifies the dynamics of the system [26][27][28] .…”

Phonon Dephasing Dynamics in MoS2

“…exceeding the phonon oscillation frequency − in a stimulated Raman process. However, it is not widely appreciated in the 2D material community that spontaneous Raman scattering also represents a coherent light–matter interaction process within the phonon coherence time. , This spontaneous Raman process has been used to generate the motional entanglement between vibrational states of two millimeter-sized diamonds at room temperature . This scheme is just one specific example of the widely applied long-distance quantum communication protocol with linear optics .…”