A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements

• URL: http://arxiv.org/abs/2410.14828v1
• Date: Fri, 18 Oct 2024 18:53:30 GMT
• Title: A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements
• Authors: Kristen M. Parzuchowski, Michael D. Mazurek, Charles H. Camp Jr., Martin J. Stevens, Ralph Jimenez,
• Abstract summary: We introduce a toluene-filled fiber platform for two-photon absorption measurements. With only a 7.3 nL excitation volume, we measure classical two-photon absorption (C2PA) at an average laser power as low as 1.75 nW.
• Score: 0.0
• License:
• Abstract: We introduce a toluene-filled fiber platform for two-photon absorption measurements. By confining both the light and molecular sample inside the 5 $\mu$m hollow core of the fiber, we increase the distance over which the nonlinear light-matter interaction occurs. With only a 7.3 nL excitation volume, we measure classical two-photon absorption (C2PA) at an average laser power as low as 1.75 nW, which is a 45-fold improvement over a conventional free-space technique. We use this platform to attempt to measure entangled two-photon absorption (E2PA), a process with a limited operating regime due to a crossover in dominating processes from E2PA to C2PA as photon flux is increased. Recently, several teams of researchers have reported that E2PA cross sections are much smaller than previously claimed. As a result, the process dominates at photon fluxes so low that it is extremely difficult or impossible to measure using conventional free-space techniques. In this report, we implement the first E2PA measurement using a waveguide. We see no evidence of E2PA, and we set an upper bound on the cross section consistent with these recent reports.

Related papers

• Integrated, bright, broadband parametric down-conversion source for quantum metrology and spectroscopy [0.0]
  In this work we demonstrate an integrated two-colour SPDC source utilising a group-velocity matched lithium niobate waveguide. By converting a narrow band pump to broadband pulses the created photon pairs show correlation times of $Delta tau approx 120,textfs$ while maintaining the narrow bandwidth $Delta omega_p ll 1,textMHz$ of the CW pump light, yielding strong time-frequency entanglement.
  arXiv  Detail & Related papers  (2024-02-27T13:57:16Z)
• Two-photon absorption cross sections of pulsed entangled beams [0.0]
  Entangled two-photon absorption (ETPA) could form the basis of nonlinear quantum spectroscopy. We show that quantum-enhanced cross sections can persist even to very large photon numbers.
  arXiv  Detail & Related papers  (2023-11-30T19:57:41Z)
• Optimal baseline exploitation in vertical dark-matter detectors based on atom interferometry [50.06952271801328]
  Several terrestrial detectors for gravitational waves and dark matter based on long-baseline atom interferometry are currently in the final planning stages or already under construction. We show that resonant-mode detectors based on multi-diamond fountain gradiometers achieve the optimal, shot-noise limited, sensitivity if their height constitutes 20% of the available baseline.
  arXiv  Detail & Related papers  (2023-09-08T08:38:24Z)
• Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power [51.961447341691]
  Nonclassical photon sources of high brightness are key components of quantum communication technologies. We here demonstrate the generation of narrowband, nonclassical photon pairs by employing spontaneous four-wave mixing in an optically-dense ensemble of cold atoms within a hollow-core fiber.
  arXiv  Detail & Related papers  (2022-08-10T09:04:15Z)
• Aspects of Two-photon Absorption of Squeezed Light: the CW limit [0.0]
  We find an enhancement of the two-photon absorption due to resonant contributions from the large squeezed light bandwidth. One-photon absorption is the dominant process in the region of parameter space where a large enhancement of the two-photon absorption is possible.
  arXiv  Detail & Related papers  (2022-05-16T07:34:03Z)
• Theory of Two-Photon Absorption with Broadband Squeezed Vacuum [0.0]
  We present an analytical quantum theoretic model for non-resonant molecular two-photon absorption (TPA) of broadband, spectrally multi-mode squeezed vacuum. The results are relevant to the potential use of entangled-light TPA as a spectroscopic and imaging method.
  arXiv  Detail & Related papers  (2022-02-02T19:15:20Z)
• Hot-Band Absorption Can Mimic Entangled Two-Photon Absorption [52.77024349608834]
  We investigated the fluorescence signals from Rhodamine 6G and LDS798 excited with a CW laser or an entangled photon pair source at 1060 nm. We observed a signal that originates from hot-band absorption (HBA), which is one-photon absorption from thermally-populated vibrational levels of the ground electronic state. For the typical conditions under which E2PEF measurements are performed, contributions from the HBA process could lead to a several orders-of-magnitude overestimate of the quantum advantage for excitation efficiency.
  arXiv  Detail & Related papers  (2021-11-10T21:17:47Z)
• Bright squeezed vacuum for two-photon spectroscopy: simultaneously high resolution in time and frequency, space and wavevector [0.0]
  Entangled photons offer two advantages for two-photon absorption spectroscopy. One is the linear scaling of two-photon absorption rate with the input photon flux. The other is the overcoming of the classical constraints for simultaneous resolution in time-frequency and in space-wavevector.
  arXiv  Detail & Related papers  (2021-10-25T11:59:05Z)
• Understanding photoluminescence in semiconductor Bragg-reflection waveguides: Towards an integrated, GHz-rate telecom photon pair source [47.399953444625154]
  semiconductor integrated sources of photon pairs may operate at pump wavelengths much closer to the bandgap of the materials. We show that devices operating near the long wavelength end of the S-band or the short C-band require temporal filtering shorter than 1 ns. We predict that shifting the operating wavelengths to the L-band and making small adjustments in the material composition will reduce the amount of photoluminescence to negligible values.
  arXiv  Detail & Related papers  (2020-10-12T06:27:30Z)
• Setting bounds on two-photon absorption cross-sections in common fluorophores with entangled photon pair excitation [48.7576911714538]
  We use a fluorescence-based registration scheme to experimentally determine upper bounds on the cross-sections for six fluorophores. For two samples that have been studied by others, Rhodamine 6G and 9R-S, we measure upper bounds four and five orders of magnitude lower than the previously reported cross-sections.
  arXiv  Detail & Related papers  (2020-08-06T13:53:16Z)
• Collective radiation from distant emitters [63.391402501241195]
  We show that the spectrum of the radiated field exhibits non-Markovian features such as linewidth broadening beyond standard superradiance. We discuss a proof-of-concept implementation of our results in a superconducting circuit platform.
  arXiv  Detail & Related papers  (2020-06-22T19:03:52Z)

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.