Characterizing mixed state entanglement through single-photon interference

• URL: http://arxiv.org/abs/2009.02829v1
• Date: Sun, 6 Sep 2020 23:38:02 GMT
• Title: Characterizing mixed state entanglement through single-photon interference
• Authors: Mayukh Lahiri, Radek Lapkiewicz, Armin Hochrainer, Gabriela Barreto Lemos and Anton Zeilinger
• Abstract summary: Entanglement verification and measurement is essential for experimental tests of quantum mechanics. We present a method that enables us to verify and measure entanglement in a two-photon mixed state without detecting one of the photons.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement verification and measurement is essential for experimental tests of quantum mechanics and also for quantum communication and information science. Standard methods of verifying entanglement in a bipartite mixed state require detection of both particles and involve coincidence measurement. We present a method that enables us to verify and measure entanglement in a two-photon mixed state without detecting one of the photons, i.e., without performing any coincidence measurement or postselection. We consider two identical sources, each of which can generate the same two-photon mixed state but they never emit simultaneously. We show that one can produce a set of single-photon interference patterns, which contain information about entanglement in the two-photon mixed state. We prove that it is possible to retrieve the information about entanglement from the visibility of the interference patterns. Our method reveals a distinct avenue for verifying and measuring entanglement in mixed states.

Related papers

• Experimental quantum imaging distillation with undetected light [0.0]
  Imaging based on the induced coherence effect makes use of photon pairs to obtain information of an object without detecting the light that probes it. We show that our scheme can generate a high-quality image of an object even against noise levels up to 250 times the actual signal of interest.
  arXiv  Detail & Related papers  (2023-01-06T14:41:50Z)
• 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)
• Single-photon nonlocality in quantum networks [55.41644538483948]
  We show that the nonlocality of single-photon entangled states can nevertheless be revealed in a quantum network made only of beamsplitters and photodetectors. Our results show that single-photon entanglement may constitute a promising solution to generate genuine network-nonlocal correlations useful for Bell-based quantum information protocols.
  arXiv  Detail & Related papers  (2021-08-03T20:13:24Z)
• 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)
• Quantum indistinguishability through exchangeable desirable gambles [69.62715388742298]
  Two particles are identical if all their intrinsic properties, such as spin and charge, are the same. Quantum mechanics is seen as a normative and algorithmic theory guiding an agent to assess her subjective beliefs represented as (coherent) sets of gambles. We show how sets of exchangeable observables (gambles) may be updated after a measurement and discuss the issue of defining entanglement for indistinguishable particle systems.
  arXiv  Detail & Related papers  (2021-05-10T13:11:59Z)
• Investigating the coherent state detection probability of InGaAs/InP SPAD-based single-photon detectors [55.41644538483948]
  We investigate the probabilities of detecting single- and multi-photon coherent states on InGaAs/InP sine-gated and free-run avalanche diodes. We conclude that multi-photon state detection cannot be regarded as independent events of absorption of individual single-photon states.
  arXiv  Detail & Related papers  (2021-04-16T08:08:48Z)
• Nonlocality, steering and quantum state tomography in a single experiment [1.8631700158180744]
  We investigate whether paradigmatic measurements for quantum state tomography can be employed to certify quantum correlations. This allows us to perform state tomography on entangled qutrits, a test of Einstein-Podolsky-Rosen steering and a Bell inequality test, all within a single experiment.
  arXiv  Detail & Related papers  (2020-11-11T09:56:21Z)
• One-photon measurement of two-photon entanglement [0.0]
  Entanglement is a fundamental feature of quantum mechanics, considered a key resource in quantum information processing. Standard methods to measure entanglement require detection of both particles. We introduce a method in which detection of only one of the particles is required to characterize the entanglement of a two-particle mixed state.
  arXiv  Detail & Related papers  (2020-09-07T01:44:14Z)
• Binary Correlation Measurements [0.0]
  We show that, even with limited information, we can still reach the known minimum of three measurements for entanglement detection. The mixed quantum case appears to require more detailed information, which we illustrate by studying the concrete example of the Werner density matrix.
  arXiv  Detail & Related papers  (2020-07-21T05:28:43Z)
• Quantum-Clustered Two-Photon Walks [68.8204255655161]
  We demonstrate a previously unknown two-photon effect in a discrete-time quantum walk. Two identical bosons with no mutual interactions can remain clustered together. The two photons move in the same direction at each step due to a two-photon quantum interference phenomenon.
  arXiv  Detail & Related papers  (2020-03-12T17:02:35Z)
• Interfering distinguishable photons [0.0]
  It is assumed that distinguishing information in the preparation, evolution or measurement of a system is sufficient to destroy interference. For more than three independent quantum particles, distinguishability of the prepared states is not a sufficient condition for multiparticle interference to disappear.
  arXiv  Detail & Related papers  (2020-01-22T16:25:12Z)

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.