Related papers: Sub-femtosecond stabilization of multicore fiber for high-fidelity quantum networking at 100% duty cycle

Sub-femtosecond stabilization of multicore fiber for high-fidelity quantum networking at 100% duty cycle

URL: http://arxiv.org/abs/2509.17989v2
Date: Wed, 24 Sep 2025 19:59:15 GMT
Title: Sub-femtosecond stabilization of multicore fiber for high-fidelity quantum networking at 100% duty cycle
Authors: Takuma Nakamura, Nazanin Hoghooghi, Nicolas Fontaine, Tetsuya Hayashi, Takuji Nagashima, Nicholas V. Nardelli, Dileep V. Reddy, Martin J. Stevens, Tara Fortier, Lynden K. Shalm, Franklyn Quinlan,
Abstract summary: MCF cores have a high degree of noise correlation which can be harnessed for a variety of applications.<n>We achieve 100 attosecond integrated jitter on one core by using phase information derived from another core.<n>Our results with MCF are a promising approach to ultra-stable quantum networks with 100% duty cycle on the quantum channel.
Score: 2.121469897194146
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Originally envisioned as a solution for the capacity crunch in telecommunications networks, multicore fibers (MCF) are contributing to scientific fields beyond telecom, such as sensing and metrology. Confined within the same cladding, the cores of MCF have a high degree of noise correlation which can be harnessed for a variety of applications. Here, we investigate MCF as a solution to the challenging problem of quantum and classical light co-existence in quantum networks by operating the quantum and stabilization light in separate but highly correlated cores of a 7-core MCF. Over 40 km of spooled fiber, we achieved 100 attosecond integrated jitter on one core by using phase information derived from another core. This allows for 100% duty cycle on a quantum channel while maintaining a low spurious photon rate from crosstalk between stabilization and quantum channels. With cycle-slip-free stabilization over 6 hours, frequency detuning between designated stabilization and quantum channels, and an additional 40 dB rejection of noise photons provided by the low optical crosstalk between cores, we achieved a Raman scattering-induced spurious photon rate of only 0.01 photons/s in 100 GHz bandwidth. Our results with MCF are a promising approach to ultra-stable quantum networks with 100% duty cycle on the quantum channel.

Related papers

Passive Synchronization of Nonlocal Franson Interferometry for Fiber-Based Quantum Networks Using Co-propagating Classical Clock Signals [8.327606178766588]
Over 50 km of single-mode fiber, this co-propagation enables nonlocal quantum interference with a visibility of (88.35pm3.62)%.<n>This work provides a practical, scalable synchronization solution for metropolitan-scale entanglement-based quantum networks.
arXiv Detail & Related papers (2026-02-25T01:23:00Z)
Integrated polarization-entangled photon source for wavelength-multiplexed quantum networks [49.82426139329382]
We present a simple yet high-performance on-chip polarization-entangled photon-pair source on thin-film lithium niobate (TFLN)<n>Our device employs dual quasi-phase matching (D-QPM) that sequentially supports type-0 and type-I spontaneous parametric down-conversion in a single nanophotonic waveguide.<n>We realize wavelength-multiplexed entanglement distribution in a four-user quantum network deployed over metropolitan fiber links up to 50 km.
arXiv Detail & Related papers (2025-11-27T18:30:01Z)
Phase-Stable Optical Fiber Links for Quantum Network Protocols [0.7026564887314537]
We demonstrate the distribution of single-photon-level pulses from a mode-locked laser source over a phase-stable fiber link.<n>Our results mark a necessary step towards scalable, high-rate quantum networks with a provable quantum advantage.
arXiv Detail & Related papers (2025-10-17T21:43:18Z)
Broadband spectral manipulation of single photons using cross-phase modulation [0.0]
We experimentally demonstrate broadband frequency control of heralded telecom-band single photons.<n>We present absolute frequency shifts of up to $+6.46pm0.01$,THz and $-5.74pm0.01$,THz, and bandwidth manipulation ranging from a factor of $0.66pm0.03$ to $8.4pm0.3$ times that of the input.
arXiv Detail & Related papers (2025-08-21T18:00:00Z)
Purifying quantum-dot light in a coherent frequency interface [39.58317527488534]
Quantum networks operate in the telecom wavelengths to take advantage of low-loss transmission in optical fibres. Bright quantum dots (QDs) emitting highly indistinguishable quantum states of light, such as InGaAs QDs, often emit photons in the near infrared. We report a method for simultaneously implementing spectral purification and frequency shifting of single photons from QD sources to the C-band in a periodically poled Lithium Niobate waveguide.
arXiv Detail & Related papers (2024-07-11T18:02:43Z)
Metropolitan-scale Entanglement Distribution with Co-existing Quantum and Classical Signals in a single fiber [0.0]
Development of prototype metropolitan-scale quantum networks involves transmitting quantum information via deployed optical fibers. One approach addressing these challenges is to co-propagate classical probe signals in the same fiber as the quantum signal. Here, we demonstrate the distribution of polarization entangled quantum signals co-propagating with the White Rabbit Precision Time Protocol (WR-PTP) classical signals in the same single-core fiber strand at metropolitan-scale distances.
arXiv Detail & Related papers (2024-02-01T14:21:39Z)
Towards Fully Passive Time-Bin Quantum Key Distribution over Moving Free-Space Channels [36.136619420474766]
Quantum information in photonic time-bin states is typically considered impractical for moving free-space quantum communication.<n>We demonstrate a novel approach using reference frame independent time-bin quantum key distribution.<n>The scheme can be readily applied over various spatially multi-mode and fluctuating channels involving rapidly moving platforms.
arXiv Detail & Related papers (2023-02-10T03:53:21Z)
Continuous entanglement distribution over a transnational 248 km fibre link [58.720142291102135]
Entanglement is the basis of many quantum applications. We present a continuously working international link between Austria and Slovakia. We measure stable pair rates of 9 s$-1$ over an exemplary operation time of 110 hours.
arXiv Detail & Related papers (2022-03-23T13:55:27Z)
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)
Spectral multiplexing of telecom emitters with stable transition frequency [68.8204255655161]
coherent emitters can be entangled over large distances using photonic channels. We observe around 100 individual erbium emitters using a Fabry-Perot resonator with an embedded 19 micrometer thin crystalline membrane. Our results constitute an important step towards frequency-multiplexed quantum-network nodes operating directly at a telecommunication wavelength.
arXiv Detail & Related papers (2021-10-18T15:39:07Z)
Stable Polarization Entanglement based Quantum Key Distribution over Metropolitan Fibre Network [55.41644538483948]
We demonstrate a quantum key distribution implementation over deployed dark telecom fibers with polarisation-entangled photons generated at the O-band. One of the photons in the pairs are propagated through 10km of deployed fiber while the others are detected locally. This ensures continuous and stable QKD operation with an average QBER of 6.4% and a final key rate of 109 bits/s.
arXiv Detail & Related papers (2020-07-04T02:36:57Z)
Frequency-Domain Quantum Interference with Correlated Photons from an Integrated Microresonator [96.25398432840109]
We report frequency-domain Hong-Ou-Mandel interference with spectrally distinct photons generated from a chip-based microresonator. Our work establishes four-wave mixing as a tool for selective high-fidelity two-photon operations in the frequency domain.
arXiv Detail & Related papers (2020-03-14T01:48:39Z)

This list is automatically generated from the titles and abstracts of the papers in this site.