Improving the Rate-Loss Scaling in Polarization Entanglement Distribution using Single-Click Entanglement Swapping

• URL: http://arxiv.org/abs/2507.14836v1
• Date: Sun, 20 Jul 2025 06:25:16 GMT
• Title: Improving the Rate-Loss Scaling in Polarization Entanglement Distribution using Single-Click Entanglement Swapping
• Authors: Hikaru Shimizu, Joe Yoshimoto, Daiki Ichii, Junko Ishi-Hayase, Rikizo Ikuta, Masahiro Takeoka,
• Abstract summary: Polarization entanglement is susceptible to the loss, more precisely, its transmission rate in a lossy channel is limited by the scaling of O(eta), where eta is a transmittance of the channel.<n>Here, we experimentally demonstrate that this rate-loss scaling limit can be overcome by a relatively simple protocol.<n>This is possible by integrating the idea of the polarizaion-photon-number hybrid entanglement and the single-click entanglement swapping.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Polarization entanglement is widely used in optical quantum information processing due to its compatibility with standard optical components. On the other hand, it is known that polarization entanglement is susceptible to the loss, more precisely, its transmission rate in a lossy channel is limited by the scaling of O({\eta}), where {\eta} is a transmittance of the channel. Here, we experimentally demonstrate that this rate-loss scaling limit can be overcome by a relatively simple protocol. This is possible by integrating the idea of the polarizaion-photon-number hybrid entanglement and the single-click entanglement swapping. We demonstrate square root improvement of the rate-loss scaling from the conventional approaches and achieve the fidelity of 0.843 for the distributed polarization entangled photon pairs. This improvement in the rate-loss scaling is equivalent to that achieved by 1-hop quantum repeater node. Our result paves a way to build a near-future quantum network and its applications.

Related papers

• Ultrastable, low-error dynamic polarization encoding of deterministically generated single photons [0.9604873746965816]
  We report on the first demonstration of a polarization encoder for single-photon qubits based on a free-space Sagnac interferometer.<n>A quantum bit error rate of 0.69(2)% is achieved, marking the lowest error rate reported to date for high-speed information encoding on single photons.
  arXiv  Detail & Related papers  (2025-07-22T13:29:54Z)
• Low-loss polarization-maintaining router for single and entangled photons at a telecom wavelength [3.2809089669972344]
  We demonstrate a low-loss, noiseless, polarization-maintaining routing of single and entangled photons at the telecom L-band.<n>Our interferometer-based router is constructed by optics with a low angle of incidence and cross-aligned electro-optic crystals.
  arXiv  Detail & Related papers  (2025-02-18T05:37:14Z)
• Fast and Automated Optical Polarization Compensation of Fiber Unitaries [0.0]
  We present a fast and automated method for polarization compensation using liquid crystals.<n>This approach combines polarimetry based on a rotating quarter-waveplate with high-speed control of the liquid-crystal cell, offering high-fidelity compensation suitable for diverse applications.<n>Our method achieves over 99% fidelity within an average of fewer than six iterations, with further fine-tuning to reach above 99.5% fidelity.
  arXiv  Detail & Related papers  (2024-11-18T20:20:32Z)
• Passive photonic CZ gate with two-level emitters in chiral multi-mode waveguide QED [41.94295877935867]
  We design a passive conditional gate between co-propagating photons using an array of only two-level emitters. The key resource is to harness the effective photon-photon interaction induced by the chiral coupling of the emitter array to two waveguide modes. We show how to harness this non-linear phase shift to engineer a conditional, deterministic photonic gate in different qubit encodings.
  arXiv  Detail & Related papers  (2024-07-08T18:00:25Z)
• Shaping entangled photons through thick scattering media using an advanced wave beacon [0.0]
  Entangled photons propagate through a complex medium such as a biological tissue or a turbulent atmosphere. Using wavefront shaping to compensate for the scattering and retrieve the two-photon correlations is challenging due to the low signal-to-noise ratio. We propose and demonstrate a new feedback mechanism that is inspired by Klyshko's advanced wave picture.
  arXiv  Detail & Related papers  (2024-03-27T07:56:13Z)
• All-optical modulation with single-photons using electron avalanche [66.27103948750306]
  We demonstrate all-optical modulation enabled by electron avalanche process in silicon.<n>Our approach opens the possibility of gigahertz-speed, and potentially even faster, optical switching at the single-photon level.
  arXiv  Detail & Related papers  (2023-12-18T20:14:15Z)
• On-chip polarization-encoded single-qubit gates with twisted waveguides [58.720142291102135]
  We develop a theory of a twisted waveguide unveiling its eigenmodes and transmission matrix in the closed form. We demonstrate that twisted waveguides can realize virtually arbitrary polarization transformations while satisfying reasonable design constraints.
  arXiv  Detail & Related papers  (2022-12-27T16:00:07Z)
• Amplification of cascaded downconversion by reusing photons with a switchable cavity [62.997667081978825]
  We propose a scheme to amplify triplet production rates by using a fast switch and a delay loop. Our proof-of-concept device increases the rate of detected photon triplets as predicted.
  arXiv  Detail & Related papers  (2022-09-23T15:53:44Z)
• 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)
• Dispersive optical systems for scalable Raman driving of hyperfine qubits [45.82374977939355]
  We introduce a new method for generating amplitude modulation by phase modulating a laser. This approach is passively stable, offers high efficiency, and is compatible with high-power laser sources. We benchmark this new approach by globally driving an array of $sim 300$ neutral $87$Rb atomic qubits trapped in optical tweezers.
  arXiv  Detail & Related papers  (2021-10-27T18:00:00Z)
• Fibre polarization state compensation in entanglement-based quantum key distribution [62.997667081978825]
  Quantum Key Distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres. We show a technique for dynamically compensating fibre-induced alteration in a QKD system over deployed fibre.
  arXiv  Detail & Related papers  (2021-07-16T00:53:48Z)
• Effects of cavity birefringence in polarisation-encoded quantum networks [0.0]
  Generation of entanglement between distant atoms via single photons is the basis for networked quantum computing. Mirror-induced birefringence within an optical cavity introduces time-dependence to the polarisation of the photons produced. We show that such polarisation oscillation' effects can lead to severe loss of fidelity in the context of two-photon, polarisation encoded measurement-based remote entanglement schemes.
  arXiv  Detail & Related papers  (2020-08-26T17:58:53Z)

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.