Continuous entanglement distribution over a transnational 248 km fibre
link
- URL: http://arxiv.org/abs/2203.12417v1
- Date: Wed, 23 Mar 2022 13:55:27 GMT
- Title: Continuous entanglement distribution over a transnational 248 km fibre
link
- Authors: Sebastian Philipp Neumann, Alexander Buchner, Lukas Bulla, Martin
Bohmann and Rupert Ursin
- Abstract summary: 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.
- Score: 58.720142291102135
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Entanglement is the basis of many quantum applications. The technically most
mature of them, quantum key distribution, harnesses quantum correlations of
entangled photons to produce cryptographic keys of provably unbreakable
security. A key challenge in this context is the establishment of continuously
working, reliable long-distance distributions of entanglement. However,
connections via satellites don't allow for interruption-free operation, and
deployed fibre implementations have so far been limited to less than 100 km by
losses, a few hours of duty time, or use trusted nodes. Here, we present a
continuously working international link between Austria and Slovakia, directly
distributing polarization-entangled photon pairs via 248 km of deployed
telecommunication fibre. Despite 79 dB loss, we measure stable pair rates of 9
s$^{-1}$ over an exemplary operation time of 110 hours. We mitigate multi-pair
detections with strict temporal filtering, enabled by nonlocal compensation of
chromatic dispersion. Fully automatized active polarization stabilization keeps
the entangled state's visibility at 86 % for altogether 82 hours, producing 403
kbit of quantum-secure key at a rate of 1.4 bits/s. Our work paves the way for
low-maintenance, ultra-stable quantum communication over long distances,
independent of cloud coverage and time of day, thus constituting an important
step towards the quantum internet.
Related papers
- Long-lived quantum memory enabling atom-photon entanglement over 101 km
telecom fiber [2.4298261290423233]
We report on developments extending the reach for sharing entanglement between a single $87$Rb atom and a single photon over long optical fibers.
To maintain a high fidelity during the long flight times through such fibers, the coherence time of the single atom is prolonged to 7 ms by applying a long-lived qubit encoding.
This enables to observe entanglement between the atomic quantum memory and the emitted photon after passing 101 km of optical fiber with a fidelity better than 70.8$pm$2.4%.
arXiv Detail & Related papers (2023-08-17T10:00:22Z) - Quantum Key Distribution using Deterministic Single-Photon Sources over
a Field-Installed Fibre Link [2.1033685912119466]
We realize a quantum key distribution field trial using true single photons across an 18-km-long dark fibre, located in the Copenhagen metropolitan area.
A secret key generation rate of >2 kbits/s realized over a 9.6 dB channel loss is achieved with a polarization-encoded BB84 scheme.
arXiv Detail & Related papers (2023-01-23T12:43:23Z) - High quality entanglement distribution through telecommunication fiber
using near-infrared non-degenerate photon pairs [73.4643018649031]
In urban environments, the quantum channel in the form of telecommunication optical fiber (confirming to ITU G.652D standards) are available.
We investigate the possibility that for campus-type communications, entangled photons prepared in the Near-Infrared Range (NIR) can be transmitted successfully.
arXiv Detail & Related papers (2022-09-09T03:23:11Z) - 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) - Quantum interference between independent solid-state single-photon
sources separated by 300 km fiber [9.597915082806276]
We report quantum interference between two single photons from independent QDs separated by 302 km optical fiber.
Our work represents a key step to long-distance solid-state quantum networks.
arXiv Detail & Related papers (2021-06-29T16:27:28Z) - Path-encoded high-dimensional quantum communication over a 2 km
multicore fiber [50.591267188664666]
We demonstrate the reliable transmission over a 2 km long multicore fiber of path-encoded high-dimensional quantum states.
A stable interferometric detection is guaranteed, allowing for low error rates and the generation of 6.3 Mbit/s of secret key rate.
arXiv Detail & Related papers (2021-03-10T11:02:45Z) - Telecom-heralded entanglement between remote multimode solid-state
quantum memories [55.41644538483948]
Future quantum networks will enable the distribution of entanglement between distant locations and allow applications in quantum communication, quantum sensing and distributed quantum computation.
Here we report the demonstration of heralded entanglement between two spatially separated quantum nodes, where the entanglement is stored in multimode solid-state quantum memories.
We also show that the generated entanglement is robust against loss in the heralding path, and demonstrate temporally multiplexed operation, with 62 temporal modes.
arXiv Detail & Related papers (2021-01-13T14:31:54Z) - Quantum cryptography with highly entangled photons from semiconductor
quantum dots [0.0]
We report on the first implementation of the BBM92 protocol using a quantum dot source with an entanglement fidelity as high as 0.97(1).
For a proof of principle, the key generation is performed between two buildings, connected by 350 metre long fiber, resulting in an average key rate of 135 bits/s and a qubit error rate of 0.019 over a time span of 13 hours.
arXiv Detail & Related papers (2020-07-24T18:21:11Z) - 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) - Long-Distance Continuous-Variable Quantum Key Distribution over 202.81
km of Fiber [8.23629474539463]
Quantum key distribution provides secure keys resistant to code-breaking quantum computers.
Long distance continuous-variable quantum key distribution over 202.81 km of ultralow-loss optical fiber.
arXiv Detail & Related papers (2020-01-08T14:50:39Z)
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.