Autonomous stabilization of remote entanglement in a cascaded quantum network

• URL: http://arxiv.org/abs/2509.11872v2
• Date: Wed, 22 Oct 2025 01:59:50 GMT
• Title: Autonomous stabilization of remote entanglement in a cascaded quantum network
• Authors: Abdullah Irfan, Kaushik Singirikonda, Mingxing Yao, Andrew Lingenfelter, Michael Mollenhauer, Xi Cao, Aashish A. Clerk, Wolfgang Pfaff,
• Abstract summary: We show that remote entanglement can be stabilized indefinitely, instead of only periodically regenerated and redistributed after decay.<n>Our results enable on-demand delivery of high-fidelity entanglement in modular quantum processors and networks.
• Score: 0.44970015278813036
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Remote entanglement between widely separated qubits is a fundamental quantum phenomenon and a critical resource for quantum information applications. Generating entanglement between independent qubits separated by arbitrary, potentially large distances requires propagating quantum states, and is typically achieved using pulsed protocols combining distinct steps of local entanglement generation followed by distribution. This necessity raises an intriguing question: Can remote entanglement can be stabilized indefinitely, instead of only periodically regenerated and redistributed after decay? Here, we demonstrate that this is indeed possible, reporting autonomous stabilization of entanglement between two separate superconducting-qubit devices. Combining nonreciprocal waveguide coupling and local driving, we experimentally realize a symmetry-based coherent quantum-absorber scheme in a cascaded network. We quantify the degree of entanglement through quantum state tomography, finding that the protocol's entangling power is severely limited by imperfections that break the required symmetry. We show, however, that a modified protocol based on an alternate symmetry is far more robust, enabling us to achieve a concurrence approaching 0.5, a limit set only by local loss in the network. Our results enable on-demand delivery of high-fidelity entanglement in modular quantum processors and networks and pave the way for autonomously protecting distributed quantum information.

Related papers

• High-rate Scalable Entanglement Swapping Between Remote Entanglement Sources on Deployed New York City Fibers [37.977711964286314]
  Entanglement swapping between photon pairs generated at physically separated nodes over telecommunication fiber infrastructure is an essential step towards the quantum internet.<n>We demonstrate a scalable entanglement swapping experiment using naturally indistinguishable entanglement sources based on warm atomic vapor cells.<n>Our work paves the way for the practical deployment of large-scale hub-and-spoke quantum networks within cities and data centers.
  arXiv  Detail & Related papers  (2026-02-17T15:27:03Z)
• Entangling remote qubits through a two-mode squeezed reservoir [0.0]
  We show an alternative, fully autonomous process, where two remote qubits are entangled through their coupling to a quantum-correlated photonic reservoir.<n>We also show that superconducting qubits can be used to directly certify two-mode squeezing, with higher sensitivity and without the need for noise-subtraction.
  arXiv  Detail & Related papers  (2025-10-08T15:38:41Z)
• Optimizing entanglement distribution via noisy quantum channels [44.99833362998488]
  Entanglement distribution is a crucial problem in quantum information science.<n>We investigate strategies for distributing quantum entanglement between two distant parties through noisy quantum channels.
  arXiv  Detail & Related papers  (2025-06-06T13:48:20Z)
• Deterministic generation of multi-qubit entangled states among distant parties using indefinite causal order [1.556591713973462]
  We present protocols for generating $N$-qubit entangled states across multiple network nodes.<n>The results indicate that our protocols significantly improve the efficiency of long-distance entanglement generation.
  arXiv  Detail & Related papers  (2025-03-05T11:40:19Z)
• A Large-Scale Reconfigurable Multiplexed Quantum Photonic Network [34.82692226532414]
  Entanglement distribution in quantum networks will enable next-generation technologies for quantum-secured communications, distributed quantum computing and sensing.<n>Future quantum networks will require dense connectivity, allowing multiple users to share entanglement in a reconfigurable and multiplexed manner.<n>We demonstrate a prototype global reconfigurable network where entanglement is routed and teleported in a flexible and multiplexed manner between two local multi-user networks composed of four users each.
  arXiv  Detail & Related papers  (2025-01-13T12:35:41Z)
• Heralded entanglement of on-demand spin-wave solid-state quantum memories for multiplexed quantum network links [0.0]
  We show telecom heralded entanglement between spatially separated quantum memories with fully adjustable recall time and temporal multiplexing of 15 modes.<n>Results establish our architecture as a prime candidate for the implementation of scalable high-rate quantum network links.
  arXiv  Detail & Related papers  (2025-01-07T20:26:06Z)
• Quantum Advantage in Distributed Sensing with Noisy Quantum Networks [37.23288214515363]
  It is critically important to analyze the achievability of quantum advantage under realistic imperfections.<n>We show that quantum advantage in distributed sensing can be achieved with noisy quantum networks which can only distribute noisy entangled states.
  arXiv  Detail & Related papers  (2024-09-25T16:55:07Z)
• Realizing fracton order from long-range quantum entanglement in programmable Rydberg atom arrays [45.19832622389592]
  Storing quantum information requires battling quantum decoherence, which results in a loss of information over time. To achieve error-resistant quantum memory, one would like to store the information in a quantum superposition of degenerate states engineered in such a way that local sources of noise cannot change one state into another. We show that this platform also allows to detect and correct certain types of errors en route to the goal of true error-resistant quantum memory.
  arXiv  Detail & Related papers  (2024-07-08T12:46:08Z)
• Stabilizing remote entanglement via waveguide dissipation [0.10241134756773226]
  We demonstrate the autonomous stabilization of remote entanglement between a pair of non-interacting qubits connected by an open waveguide on a chip. The decoherence-protected, steady-state remote entanglement offered via dissipative stabilization may find applications in distributed quantum computing, sensing, and communication.
  arXiv  Detail & Related papers  (2024-02-24T03:25:58Z)
• Multiplexed quantum repeaters based on single-photon interference with mild stabilization [0.0]
  We present a quantum repeater scheme that leverages single-photon interference with reduced difficulty of phase stabilization. Under specific conditions, we demonstrate that our scheme achieves a higher entanglement distribution rate between end nodes compared to existing schemes.
  arXiv  Detail & Related papers  (2024-01-17T19:58:28Z)
• Asynchronous Quantum Repeater using Multiple Quantum Memory [0.6445605125467574]
  A full-fledged quantum network relies on the formation of entangled links between remote location with the help of quantum repeaters. We propose a quantum repeater protocol using the idea of post-matching, which retains the same efficiency as the single-photon interference protocol.
  arXiv  Detail & Related papers  (2024-01-11T08:24:37Z)
• The Quantum Internet: an Efficient Stabilizer states Distribution Scheme [0.0]
  Quantum networks constitute a major part of quantum technologies. They will boost quantum computing drastically by providing a scalable modular architecture of quantum chips. They will provide the backbone of the future quantum internet, allowing for high margins of security.
  arXiv  Detail & Related papers  (2023-05-04T08:53:38Z)
• Reliable Quantum Communications based on Asymmetry in Distillation and Coding [35.693513369212646]
  We address the problem of reliable provision of entangled qubits in quantum computing schemes. We combine indirect transmission based on teleportation and distillation; (2) direct transmission, based on quantum error correction (QEC) Our results show that ad-hoc asymmetric codes give, compared to conventional QEC, a performance boost and codeword size reduction both in a single link and in a quantum network scenario.
  arXiv  Detail & Related papers  (2023-05-01T17:13:23Z)
• Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array [55.41644538483948]
  We present and analyze a protocol for driven-dissipatively preparing and stabilizing a manifold of quantum manybody entangled states. We perform theoretical modeling of this platform via pulse-level simulations based on physical features of real devices. Our work shows the capacity of driven-dissipative superconducting cQED systems to host robust and self-corrected quantum manybody states.
  arXiv  Detail & Related papers  (2023-03-21T18:02:47Z)
• 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)
• Deterministic distribution of multipartite entanglement and steering in a quantum network by separable states [14.388536745297214]
  Einstein-Podolsky-Rosen entanglement and steering play important roles in quantum-enhanced communication protocols. We experimentally demonstrate the deterministic distribution of two- and three-mode Gaussian entanglement and steering by transmitting separable states in a network consisting of a quantum server and multiple users.
  arXiv  Detail & Related papers  (2021-01-05T09:15:54Z)
• Transmon platform for quantum computing challenged by chaotic fluctuations [55.41644538483948]
  We investigate the stability of a variant of a many-body localized (MBL) phase for system parameters relevant to current quantum processors. We find that these computing platforms are dangerously close to a phase of uncontrollable chaotic fluctuations.
  arXiv  Detail & Related papers  (2020-12-10T19:00:03Z)

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.