Postselection-Free Cavity-Enhanced Narrow-Band Orbital Angular Momentum Entangled Photon Source

• URL: http://arxiv.org/abs/2502.05572v1
• Date: Sat, 08 Feb 2025 13:51:12 GMT
• Title: Postselection-Free Cavity-Enhanced Narrow-Band Orbital Angular Momentum Entangled Photon Source
• Authors: Pei Wan, Wen-Zheng Zhu, Yan-Chao Lou, Zi-Mo Cheng, Zhi-Cheng Ren, Han Zhang, Xi-Lin Wang, Hui-Tian Wang,
• Abstract summary: We propose a solution that realizes the first postselection-free cavity-enhanced narrow-band entangled photon pairs. We deterministically transfer the OAM entanglement to polarization one with almost no loss and obtain polarization entangled two photons with a fidelity of 0.948(2). Our results provide an efficient and promising approach to create narrow-band entangled photon sources for memory-based long-distance quantum communication and network.
• Score: 2.436695919413355
• License:
• Abstract: Cavity-enhanced spontaneous parametric down-conversion (SPDC) provides a significant way to produce $\sim$10 MHz narrow-band photon pairs, which matches the bandwidth of photon for quantum memory. However, the output photon pairs from the cavity is not entangled and the postselection is required to create the entanglement outside the cavity, so the direct output of cavity-enhanced narrow-band entangled photon pairs is still an open challenge. Here we propose a solution that realizes the first postselection-free cavity-enhanced narrow-band entangled photon pairs. The entanglement is achieved in degree of freedom (DOF) of orbital angular momentum (OAM) by implementing an OAM-conservation SPDC process in an actively and precisely controlled cavity supporting degenerate high-order OAM modes. The measured linewidth for the two photons is 13.8 MHz and the measured fidelity is 0.969(3) for the directly generated OAM entangled two photons. We deterministically transfer the OAM entanglement to polarization one with almost no loss and obtain polarization entangled two photons with a fidelity of 0.948(2). Moreover, we produce narrow-band OAM-polarization hyperentangled photon pairs with a fidelity of 0.850(2) by establishing polarization entanglement with preservation of OAM entanglement, which is realized by interfering the two photons on a polarizing beam splitter (PBS) and post-selecting the events of one and only one photon in on each of the PBS port. Novel cavity may find applications in cavity-based light-matter interaction. Our results provide an efficient and promising approach to create narrow-band entangled photon sources for memory-based long-distance quantum communication and network.

Related papers

• Ultrabright fiber-coupled ploarization-entangled photon source with spectral brightness surpassing 2.0 MHz/mW/nm [0.6581049960856515]
  We present an ultrabright polarization-entangled photon source that is optimally coupled into single-mode fibers. By employing a simple mode-matching optical setup, we optimize the SMF coupling and heralding efficiencies of the photon-pairs. This represents the highest spectral brightness of SPDC photons generated using a CW laser pumped bulk crystal to date.
  arXiv  Detail & Related papers  (2024-09-23T23:50:03Z)
• Polarization Entanglement with highly non-degenerate photon pairs enhanced by effective walk-off compensation method [0.0]
  We demonstrate polarization entanglement in non-degenerate photon pairs using bulk periodically poled Lithium Niobate (PPLN) crystals. We introduce an effective compensation method using birefringent crystal wedges to eliminate spatial and temporal walkoffs simultaneously.
  arXiv  Detail & Related papers  (2024-05-10T18:12:51Z)
• Passive and Deterministic Controlled-phase Gate for Single-photon Wavepackets Based on Time-reversal Symmetric Photon Transport [0.6813925418351434]
  The proposed gate is rooted in the concept of time-reversal symmetric photon transport. It can circumvent the longstanding issue of wavepacket distortion inherent in photonic phase gates employing nonlinear media. The gate fidelity can exceed 99% for a node with only four cavities for both single-photon and two-photon operations.
  arXiv  Detail & Related papers  (2023-12-17T13:39:44Z)
• On-chip quantum information processing with distinguishable photons [55.41644538483948]
  Multi-photon interference is at the heart of photonic quantum technologies. Here, we experimentally demonstrate that detection can be implemented with a temporal resolution sufficient to interfere photons detuned on the scales necessary for cavity-based integrated photon sources. We show how time-resolved detection of non-ideal photons can be used to improve the fidelity of an entangling operation and to mitigate the reduction of computational complexity in boson sampling experiments.
  arXiv  Detail & Related papers  (2022-10-14T18:16:49Z)
• 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)
• Silicon nitride waveguides with intrinsic single-photon emitters for integrated quantum photonics [97.5153823429076]
  We show the first successful coupling of photons from intrinsic single-photon emitters in SiN to monolithically integrated waveguides made of the same material. Results pave the way toward the realization of scalable, technology-ready quantum photonic integrated circuitry.
  arXiv  Detail & Related papers  (2022-05-17T16:51:29Z)
• Telecom-band Hyperentangled Photon Pairs from a Fiber-based Source [49.06242674127539]
  We experimentally demonstrate the generation of telecom-band biphotons hyperentangled in both the polarization and frequency DoFs. The states produced by our hyperentanglement source can enable protocols such as dense coding and high-dimensional quantum key distribution.
  arXiv  Detail & Related papers  (2021-12-06T21:37:43Z)
• Room-temperature on-chip orbital angular momentum single-photon sources [2.6929576641257778]
  On-chip sources carrying orbital angular momentum (OAM) are in demand for high-capacity optical information processing. We demonstrate a room-temperature on-chip integrated OAM source that emits well-collimated single photons. Our OAM single-photon sources bridge the gap between conventional OAM manipulation and nonclassical light sources.
  arXiv  Detail & Related papers  (2021-04-02T15:57:34Z)
• Maximally entangled and GHz-clocked on-demand photon pair source [1.8428167155752175]
  We present a 1 GHz-clocked, maximally entangled and on-demand photon pair source based on droplet etched GaAs quantum dots using two-photon excitation.
  arXiv  Detail & Related papers  (2020-10-22T15:54:35Z)
• 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)
• Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
  Integrated photonics is a robust platform for quantum information processing. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
  arXiv  Detail & Related papers  (2020-05-19T16:46:44Z)

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.