Effects of coherence on temporal resolution

• URL: http://arxiv.org/abs/2103.10833v2
• Date: Wed, 7 Jul 2021 10:00:03 GMT
• Title: Effects of coherence on temporal resolution
• Authors: Syamsundar De, Jano Gil-Lopez, Benjamin Brecht, Christine Silberhorn, Luis L. Sanchez-Soto, Z. Hradil and J. Rehacek
• Abstract summary: We experimentally investigate the effect of varying coherence on estimating the temporal separation between two single-photon pulses. Our experiment demonstrates that coherent mode projections are optimal for any degree of coherence.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Measuring small separations between two optical sources, either in space or in time, constitute an important metrological challenge as standard intensity-only measurements fail for vanishing separations. Contrarily, it has been established that appropriate coherent mode projections can appraise arbitrarily small separations with quantum-limited precision. However, the question of whether the optical coherence brings any metrological advantage to mode projections is still a point of debate. Here, we elucidate this problem by experimentally investigating the effect of varying coherence on estimating the temporal separation between two single-photon pulses. We show that, for an accurate interpretation, special attention must be paid to properly normalize the quantum Fisher information to account for the strength of the signal. Our experiment demonstrates that coherent mode projections are optimal for any degree of coherence.

Related papers

• Superresolution in separation estimation between two dynamic incoherent sources using spatial demultiplexing [0.0]
  Recently, perfect measurement based on spatial mode demultiplexing (SPADE) in Hermite-Gauss modes allowed one to reach the quantum limit of precision for estimation of separation between two weak incoherent stationary sources. In this paper, we consider another deviation from the perfect setup by discarding the assumption about the stationarity of the sources. We formulate a measurement algorithm that allows for the reduction of one parameter for estimation in the stationary sources scenario.
  arXiv  Detail & Related papers  (2024-07-15T07:57:57Z)
• Exploiting separation-dependent coherence to boost optical resolution [0.0]
  We resolve two thermal sources sharing arbitrary mutual coherence using the spatial mode demultiplexing technique. Our analytical study includes scenarios where the coherence and the emission rate depend on the separation between the sources, and is not limited to the faint sources limit.
  arXiv  Detail & Related papers  (2024-01-24T16:18:29Z)
• Classification of quantum states of light using random measurements through a multimode fiber [42.5342379899288]
  We present an optical scheme based on sending unknown input states through a multimode fiber. A short multimode fiber implements effectively a random projection in the spatial domain. A long-dispersive multimode fiber performs a spatial and spectral projection.
  arXiv  Detail & Related papers  (2023-10-20T15:48:06Z)
• Quantum limits to resolution and discrimination of spontaneous emission lifetimes [0.0]
  We focus on the model problem of resolving two mutually incoherent exponential decays with highly overlapping temporal probability profiles. We find that direct lifetime measurement suffers from an analogue of "Rayleigh's Curse" when the time constants of the two decay channels approach one another.
  arXiv  Detail & Related papers  (2022-02-09T00:13:55Z)
• Experimentally determining the incompatibility of two qubit measurements [55.41644538483948]
  We describe and realize an experimental procedure for assessing the incompatibility of two qubit measurements. We demonstrate this fact in an optical setup, where the qubit states are encoded into the photons' polarization degrees of freedom.
  arXiv  Detail & Related papers  (2021-12-15T19:01:44Z)
• Quantum asymmetry and noisy multi-mode interferometry [55.41644538483948]
  Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator. We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
  arXiv  Detail & Related papers  (2021-07-23T07:30:57Z)
• Distinguishability and "which pathway" information in multidimensional interferometric spectroscopy with a single entangled photon-pair [0.0]
  Photon exchange-phase and degree of distinguishability have not been widely utilized in quantum-enhanced applications. We show that even at low degree entanglement, when a two-photon wave-function is coupled to matter, it is encoded with a reliable "which pathway?" information. We find that quantum-light interferometry facilitates utterly different set of time-delay variables, which are unbound by uncertainty to the inverse bandwidth of the wave-packet.
  arXiv  Detail & Related papers  (2021-07-12T07:19:58Z)
• Observation-dependent suppression and enhancement of two-photon coincidences by tailored losses [68.8204255655161]
  Hong-Ou-Mandel (HOM) effect can lead to a perfect suppression of two-particle coincidences between the output ports of a balanced beam splitter. In this work, we demonstrate experimentally that the two-particle coincidence statistics of two bosons can instead be seamlessly tuned to substantial enhancement. Our findings reveal a new approach to harnessing non-Hermitian settings for the manipulation of multi-particle quantum states.
  arXiv  Detail & Related papers  (2021-05-12T06:47:35Z)
• Symmetry allows for distinguishability in totally destructive many-particle interference [52.77024349608834]
  We investigate, in a four photon interference experiment in a laser-written waveguide structure, how symmetries control the suppression of many-body output events of a $J_x$ unitary. We show that totally destructive interference does not require mutual indistinguishability between all, but only between symmetrically paired particles.
  arXiv  Detail & Related papers  (2021-02-19T16:37:19Z)
• Observing coherences with time-resolved photoemission [77.34726150561087]
  We discuss the potential creation and measurement of coherences in both dispersive solids and qubit-like single levels using current generation time- and angle-resolved photoemission technology. We show that in both cases, when both the pump and the probe overlap energetically with the coherent levels, that the time-resolved photoemission signal shows a beating pattern at the energy difference between the levels. In the case of dispersive bands, this leads to momentum-dependent oscillations, which may be used to map out small energy scales in the band structure.
  arXiv  Detail & Related papers  (2020-05-18T18:00:02Z)
• Wave-particle duality using the Compton effect [0.0]
  We study the consequences of the beam-splitter recoil, during the passage of the photon, over the interference pattern produced by the device. Fortuitously, the model used to describe the interaction between the idealized beam-splitter and the photon clearly indicates that an interferometer based on Compton's effect could be build to study wave-particle duality.
  arXiv  Detail & Related papers  (2020-05-06T16:23:56Z)

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.