Quantum and classical correlations in four-wave mixing from cold ensembles of two-level atoms

• URL: http://arxiv.org/abs/2410.22513v2
• Date: Sat, 23 Nov 2024 16:36:46 GMT
• Title: Quantum and classical correlations in four-wave mixing from cold ensembles of two-level atoms
• Authors: Lucas S. Marinho, Michelle O. Araújo, Daniel Felinto,
• Abstract summary: Quantum correlations in four-wave-mixing from ensembles of cold two-level atoms may prevail without filtering over background light. We show that the decay rate of the quantum correlations changes with the number of atoms in the sample, providing another indication of its superradiance-like nature.
• Score: 0.0
• License:
• Abstract: Quantum correlations in four-wave-mixing from ensembles of cold two-level atoms may prevail without filtering over background light with well-known classical interpretations, such as Rayleigh scattering, as recently experimentally demonstrated in [Phys. Rev. Lett. {\bf 128}, 083601 (2022)]. Here we provide an extended investigation of this effect, in which we detail the experimental procedure and the variation of the quantum correlation with various parameters of the system. Particularly, we show that the decay rate of the quantum correlations changes with the number of atoms in the sample, providing another indication of its superradiance-like nature. The non-classical aspects of the signal occur for short timescales, but the long timescales carry as well a lot of information on the classical correlations of the system. This slow classical regime presents also two clearly distinct time scales, which we explain by two different pathways for the creation of biphotons. From the global analysis of the data in all its timescales, we are able to derive an empirical expression to fit the data, resulting in information on, among other parameters, the sample's temperature and superradiant-like acceleration. In general, the reported quantum correlations present a dependence on critical parameters of the system, such as optical depth and excitation power, that is quite different from other systems used for biphoton generation, and are more robust to changes in these parameters. This opens the possibility of exploring this process for efficient generation of narrowband biphotons or of other quantum-correlated photonic states of higher order.

Related papers

• Amplification of quantum transfer and quantum ratchet [56.47577824219207]
  We study a model of amplification of quantum transfer and making it directed which we call the quantum ratchet model. The ratchet effect is achieved in the quantum control model with dissipation and sink, where the Hamiltonian depends on vibrations in the energy difference synchronized with transitions between energy levels. Amplitude and frequency of the oscillating vibron together with the dephasing rate are the parameters of the quantum ratchet which determine its efficiency.
  arXiv  Detail & Related papers  (2023-12-31T14:04:43Z)
• Quantum Effects on the Synchronization Dynamics of the Kuramoto Model [62.997667081978825]
  We show that quantum fluctuations hinder the emergence of synchronization, albeit not entirely suppressing it. We derive an analytical expression for the critical coupling, highlighting its dependence on the model parameters.
  arXiv  Detail & Related papers  (2023-06-16T16:41:16Z)
• Quantum chaos in the Dicke model and its variants [0.0]
  We calculate the out-of-time-ordered correlator (OTOC) for different variations of the Dicke model in an open quantum system setting. This becomes important for the experimental studies of the OTOC and quantum chaos in the models of quantum optics.
  arXiv  Detail & Related papers  (2023-05-24T18:53:33Z)
• Quantum Lyapunov exponent in dissipative systems [68.8204255655161]
  The out-of-time order correlator (OTOC) has been widely studied in closed quantum systems. We study the interplay between these two processes. The OTOC decay rate is closely related to the classical Lyapunov.
  arXiv  Detail & Related papers  (2022-11-11T17:06:45Z)
• Quantum chaos and thermalization in the two-mode Dicke model [77.34726150561087]
  We discuss the onset of quantum chaos and thermalization in the two-mode Dicke model. The two-mode Dicke model exhibits normal to superradiant quantum phase transition. We show that the temporal fluctuations of the expectation value of the collective spin observable around its average are small and decrease with the effective system size.
  arXiv  Detail & Related papers  (2022-07-08T11:16:29Z)
• The Hong-Ou-Mandel experiment: from photon indistinguishability to continuous variables quantum computing [0.0]
  We extensively discuss the Hong-Ou-Mandel experiment taking an original phase-space-based perspective. We analyze time and frequency variables as quantum continuous variables in perfect analogy with position and momentum of massive particles or with the electromagnetic field's quadratures.
  arXiv  Detail & Related papers  (2022-06-03T11:53:11Z)
• Correlated steady states and Raman lasing in continuously pumped and probed atomic ensembles [68.8204255655161]
  We consider an ensemble of Alkali atoms that are continuously optically pumped and probed. Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state. We find and characterize regimes of Raman lasing, akin to the model of a superradiant laser.
  arXiv  Detail & Related papers  (2022-05-10T06:54:54Z)
• Two-Photon Interference of Single Photons from Dissimilar Sources [0.0]
  Entanglement swapping and heralding are at the heart of many protocols for distributed quantum information. We develop a theoretical description of pulsed two-photon interference of photons from dissimilar sources. We study their dependence on critical system parameters such as quantum state lifetime and frequency detuning.
  arXiv  Detail & Related papers  (2022-02-10T07:51:27Z)
• Uncover quantumness in the crossover from BEC to quantum-correlated phase [0.0]
  We examine the role of the quantum entanglement of an assembly of two-level emitters coupled to a single-mode cavity. This allows us to characterise the quantum correlated state for each regime.
  arXiv  Detail & Related papers  (2021-01-18T05:06:59Z)
• Quantum time dilation in atomic spectra [62.997667081978825]
  We demonstrate how quantum time dilation manifests in a spontaneous emission process. The resulting emission rate differs when compared to the emission rate of an atom prepared in a mixture of momentum wave packets. We argue that spectroscopic experiments offer a technologically feasible platform to explore the effects of quantum time dilation.
  arXiv  Detail & Related papers  (2020-06-17T18:03:38Z)
• Driving Quantum Correlated Atom-Pairs from a Bose-Einstein Condensate [0.0]
  We investigate one such control protocol that demonstrates the resonant amplification of quasimomentum pairs from a Bose-Einstein condensate. A classical external field that excites pairs of particles with the same energy but opposite momenta is reminiscent of the coherently-driven nonlinearity in a parametric amplifier crystal.
  arXiv  Detail & Related papers  (2020-01-08T00:11:26Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.