Rate limits in quantum networks with lossy repeaters

• URL: http://arxiv.org/abs/2110.10168v2
• Date: Sun, 6 Mar 2022 11:47:50 GMT
• Title: Rate limits in quantum networks with lossy repeaters
• Authors: Riccardo Laurenza, Nathan Walk, Jens Eisert and Stefano Pirandola
• Abstract summary: We quantify how the presence of loss in repeater stations affect the maximum attainable rates for quantum communication. In the linear chain scenario we show that, by increasing the number of repeater stations, the maximum rate cannot overcome a quantity which solely depends on the loss of a single station.
• Score: 0.6299766708197883
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The derivation of ultimate limits to communication over certain quantum repeater networks have provided extremely valuable benchmarks for assessing near-term quantum communication protocols. However, these bounds are usually derived in the limit of ideal devices and leave questions about the performance of practical implementations unanswered. To address this challenge, we quantify how the presence of loss in repeater stations affect the maximum attainable rates for quantum communication over linear repeater chains and more complex quantum networks. Extending the framework of node splitting, we model the loss introduced at the repeater stations and then prove the corresponding limits. In the linear chain scenario we show that, by increasing the number of repeater stations, the maximum rate cannot overcome a quantity which solely depends on the loss of a single station. We introduce a way of adapting the standard machinery for obtaining bounds to this realistic scenario. The difference is that whilst ultimate limits for any strategy can be derived given a fixed channel, when the repeaters introduce additional decoherence, then the effective overall channel is itself a function of the chosen repeater strategy (e.g., one-way versus two-way classical communication). Classes of repeater strategies can be analysed using additional modelling and the subsequent bounds can be interpreted as the optimal rate within that class.

Related papers

• Comparing One- and Two-way Quantum Repeater Architectures [9.942288691108914]
  Quantum repeaters are an essential building block for realizing long-distance quantum communications. Due to the fragile nature of quantum information, these repeaters suffer from loss and operational errors. Recent increases in the number of available memories, and introduction of entanglement generation through multiplexing motivate a re-comparison of one-way and two-way repeater architectures.
  arXiv  Detail & Related papers  (2024-09-10T01:55:01Z)
• Generalized quantum repeater graph states [1.7635061227370266]
  We present a new approach to ensure the loss tolerance of distributing a single ebit. We demonstrate that our new scheme significantly outperforms the previous work with much flexibility. These findings offer new insights into the scalability and reliability of loss-tolerant quantum networks.
  arXiv  Detail & Related papers  (2024-07-01T16:21:37Z)
• A Quantum-Classical Collaborative Training Architecture Based on Quantum State Fidelity [50.387179833629254]
  We introduce a collaborative classical-quantum architecture called co-TenQu. Co-TenQu enhances a classical deep neural network by up to 41.72% in a fair setting. It outperforms other quantum-based methods by up to 1.9 times and achieves similar accuracy while utilizing 70.59% fewer qubits.
  arXiv  Detail & Related papers  (2024-02-23T14:09:41Z)
• Scaling Limits of Quantum Repeater Networks [62.75241407271626]
  Quantum networks (QNs) are a promising platform for secure communications, enhanced sensing, and efficient distributed quantum computing. Due to the fragile nature of quantum states, these networks face significant challenges in terms of scalability. In this paper, the scaling limits of quantum repeater networks (QRNs) are analyzed.
  arXiv  Detail & Related papers  (2023-05-15T14:57:01Z)
• Entangled Pair Resource Allocation under Uncertain Fidelity Requirements [59.83361663430336]
  In quantum networks, effective entanglement routing facilitates communication between quantum source and quantum destination nodes. We propose a resource allocation model for entangled pairs and an entanglement routing model with a fidelity guarantee. Our proposed model can reduce the total cost by at least 20% compared to the baseline model.
  arXiv  Detail & Related papers  (2023-04-10T07:16:51Z)
• Multi-User Entanglement Distribution in Quantum Networks Using Multipath Routing [55.2480439325792]
  We propose three protocols that increase the entanglement rate of multi-user applications by leveraging multipath routing. The protocols are evaluated on quantum networks with NISQ constraints, including limited quantum memories and probabilistic entanglement generation.
  arXiv  Detail & Related papers  (2023-03-06T18:06:00Z)
• Exact rate analysis for quantum repeaters with imperfect memories and entanglement swapping as soon as possible [0.0]
  We present an exact rate analysis for a secret key that can be shared among two parties employing a linear quantum repeater chain. We consider additional tools and parameters such as memory cut-offs, multiplexing, initial state and swapping gate fidelities.
  arXiv  Detail & Related papers  (2022-03-19T12:55:56Z)
• Cluster-Promoting Quantization with Bit-Drop for Minimizing Network Quantization Loss [61.26793005355441]
  Cluster-Promoting Quantization (CPQ) finds the optimal quantization grids for neural networks. DropBits is a new bit-drop technique that revises the standard dropout regularization to randomly drop bits instead of neurons. We experimentally validate our method on various benchmark datasets and network architectures.
  arXiv  Detail & Related papers  (2021-09-05T15:15:07Z)
• Computation-aided classical-quantum multiple access to boost network communication speeds [61.12008553173672]
  We quantify achievable quantum communication rates of codes with computation property for a two-sender cq-MAC. We show that it achieves the maximum possible communication rate (the single-user capacity), which cannot be achieved with conventional design.
  arXiv  Detail & Related papers  (2021-05-30T11:19:47Z)
• Overcoming the repeaterless bound in continuous-variable quantum communication without quantum memories [0.0]
  One of the main problems in quantum communications is how to achieve high rates at long distances. We introduce a continuous-variable protocol which overcomes the repeaterless bound and scales like the single-repeater bound. We show that our scheme can be extended to longer repeater chains using quantum memories.
  arXiv  Detail & Related papers  (2021-05-08T04:02:17Z)
• Efficient optimization of cut-offs in quantum repeater chains [0.0]
  We develop an algorithm for computing the probability distribution of the waiting time and fidelity of entanglement produced by repeater chain protocols. We use the algorithm to optimize cut-offs in order to maximize secret-key rate between the end nodes of the repeater chain.
  arXiv  Detail & Related papers  (2020-05-11T09:17:21Z)

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.