End-to-End Capacities of Imperfect-Repeater Quantum Networks
- URL: http://arxiv.org/abs/2207.05481v1
- Date: Tue, 12 Jul 2022 11:46:54 GMT
- Title: End-to-End Capacities of Imperfect-Repeater Quantum Networks
- Authors: Cillian Harney, Stefano Pirandola
- Abstract summary: We present achievable end-to-end rates for noisy-repeater quantum networks.
These are obtained by extending the coherent and reverse coherent information.
We show how tight upper-bounds can also be derived by supplementing appropriate single-edge capacity bounds.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The optimal performance of a communication network is limited not only by the
quality of point-to-point channels, but by the efficacy of its constituent
technologies. Understanding the limits of quantum networks requires an
understanding of both the ultimate capacities of quantum channels and the
efficiency of imperfect quantum repeaters. In this work, using a recently
developed node-splitting technique which introduces internal losses and noise
into repeater devices, we present achievable end-to-end rates for
noisy-repeater quantum networks. These are obtained by extending the coherent
and reverse coherent information (single channel capacity lower bounds) into
end-to-end capacity lower bounds, both in the context of single-path and
multi-path routing. These achievable rates are completely general, and apply to
networks composed of arbitrary channels arranged in general topologies. Through
this general formalism, we show how tight upper-bounds can also be derived by
supplementing appropriate single-edge capacity bounds. As a result, we develop
tools which provide tight performance bounds for quantum networks constituent
of channels whose capacities are not exactly known, and reveal critical network
properties which are necessary for high-rate quantum communications. This
permits the investigation of pertinent classes of quantum networks with
realistic technologies; qubit amplitude damping networks and bosonic
thermal-loss networks.
Related papers
- Guarantees on the structure of experimental quantum networks [105.13377158844727]
Quantum networks connect and supply a large number of nodes with multi-party quantum resources for secure communication, networked quantum computing and distributed sensing.
As these networks grow in size, certification tools will be required to answer questions regarding their properties.
We demonstrate a general method to guarantee that certain correlations cannot be generated in a given quantum network.
arXiv Detail & Related papers (2024-03-04T19:00:00Z) - 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) - Routing in Quantum Repeater Networks with Mixed Efficiency Figures [10.955844285189373]
This study explores an approach to routing in quantum networks, mirroring real-world classical networks.
We focus on some key parameters in an operational quantum network such as the fraction of nodes with a higher efficiency.
Our simulations show that incorporating knowledge of node quality not only helps boost the fidelity of some of the routing paths but also reduces the number of blocked paths in the quantum network.
arXiv Detail & Related papers (2023-10-13T10:13:16Z) - Quantum-enhanced metrology with network states [8.515162179098382]
We prove a general bound that limits the performance of using quantum network states to estimate a global parameter.
Our work establishes both the limitation and the possibility of quantum metrology within quantum networks.
arXiv Detail & Related papers (2023-07-15T09:46:35Z) - Cavity-enhanced quantum network nodes [0.0]
A future quantum network will consist of quantum processors that are connected by quantum channels.
I will describe how optical resonators facilitate quantum network nodes.
arXiv Detail & Related papers (2022-05-30T18:50:35Z) - An Evolutionary Pathway for the Quantum Internet Relying on Secure
Classical Repeaters [64.48099252278821]
We conceive quantum networks using secure classical repeaters combined with the quantum secure direct communication principle.
In these networks, the ciphertext gleaned from a quantum-resistant algorithm is transmitted using QSDC along the nodes.
We have presented the first experimental demonstration of a secure classical repeater based hybrid quantum network.
arXiv Detail & Related papers (2022-02-08T03:24:06Z) - The Computational and Latency Advantage of Quantum Communication
Networks [70.01340727637825]
This article summarises the current status of classical communication networks.
It identifies some critical open research challenges that can only be solved by leveraging quantum technologies.
arXiv Detail & Related papers (2021-06-07T06:31:02Z) - Entanglement Rate Optimization in Heterogeneous Quantum Communication
Networks [79.8886946157912]
Quantum communication networks are emerging as a promising technology that could constitute a key building block in future communication networks in the 6G era and beyond.
Recent advances led to the deployment of small- and large-scale quantum communication networks with real quantum hardware.
In quantum networks, entanglement is a key resource that allows for data transmission between different nodes.
arXiv Detail & Related papers (2021-05-30T11:34:23Z) - Purification and Entanglement Routing on Quantum Networks [55.41644538483948]
A quantum network equipped with imperfect channel fidelities and limited memory storage time can distribute entanglement between users.
We introduce effectives enabling fast path-finding algorithms for maximizing entanglement shared between two nodes on a quantum network.
arXiv Detail & Related papers (2020-11-23T19:00:01Z) - Quantum communication capacity transition of complex quantum networks [1.14219428942199]
For highly connected networks, we identify a threshold transition in the capacity as the density of network nodes increases.
For scale-free networks, the end-to-end capacity saturates to constants as the number of nodes increases, and always decays with the distance.
Our results are based on capacity evaluations, therefore the minimum density requirement for an appreciable capacity applies to any general protocols of quantum networks.
arXiv Detail & Related papers (2020-11-14T21:42:04Z) - A Quantum Network Node with Crossed Optical Fibre Cavities [0.0]
We develop a quantum network node that connects to two quantum channels.
It functions as a passive, heralded and high-fidelity quantum memory.
Our node is robust, fits naturally into larger fibre-based networks, can be scaled to more cavities, and thus provides clear perspectives for a quantum internet.
arXiv Detail & Related papers (2020-04-19T12:17:17Z)
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.