scholarly journals Quantum communication capacity transition of complex quantum networks

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Quntao Zhuang ◽  
Bingzhi Zhang
Keyword(s):  
Quantum Communication ◽  
Quantum Networks ◽  
Communication Capacity

scholarly journals Quantum networks based on cavity QED

2001 ◽  
Vol 1 (Special) ◽  
pp. 7-12
Author(s):  
H. Mabuchi ◽  
M. Armen ◽  
B. Lev ◽  
M. Loncar ◽  
J. Vuckovic ◽  
...  
Keyword(s):  
Communication Networks ◽  
Quantum State ◽  
Interdisciplinary Research ◽  
Cavity Qed ◽  
Quantum Communication ◽  
Trapped Atoms ◽  
Quantum Networks ◽  
Internal States ◽  
Optical Photons ◽  
Photonic Bandgap Structures

We review an ongoing program of interdisciplinary research aimed at developing hardware and protocols for quantum communication networks. Our primary experimental goals are to demonstrate quantum state mapping from storage/processing media (internal states of trapped atoms) to transmission media (optical photons), and to investigate a nanotechnology paradigm for cavity QED that would involve the integration of magnetic microtraps with photonic bandgap structures.

A testbed for quantum communication and quantum networks

2019 ◽  
Author(s):  
Lijun Ma ◽  
Xiao Tang ◽  
Oliver Slattery ◽  
Abdella Battou
Keyword(s):  
Quantum Communication ◽  
Quantum Networks

scholarly journals Bidirectional coherent classical communication

2005 ◽  
Vol 5 (4&5) ◽  
pp. 380-395
Author(s):  
A.W. Harrow ◽  
D.W. Leung
Keyword(s):  
Quantum Communication ◽  
The Other ◽  
Achievable Rate ◽  
Classical Communication ◽  
Communication Capacity ◽  
Coherent Communication

A unitary interaction coupling two parties enables quantum or classical communication in both the forward and backward directions. Each communication capacity can be thought of as a tradeoff between the achievable rates of specific types of forward and backward communication. Our first result shows that for any bipartite unitary gate, bidirectional coherent classical communication is no more difficult than bidirectional classical communication --- they have the same achievable rate regions. Previously this result was known only for the unidirectional capacities (i.e., the boundaries of the tradeoff). We then relate the tradeoff for two-way coherent communication to the tradeoff for two-way quantum communication and the tradeoff for coherent communication in one direction and quantum communication in the other.

scholarly journals OpenFlow arbitrated programmable network channels for managing quantum metadata

2016 ◽  
Vol 16 (1) ◽  
pp. 67-77
Author(s):  
Venkat R Dasari ◽  
Travis S Humble
Keyword(s):  
Quantum Key Distribution ◽  
Quantum Communication ◽  
Network Protocols ◽  
Software Defined Network ◽  
Dense Coding ◽  
Quantum Networks ◽  
Optical Channels ◽  
Near Term ◽  
And Control ◽  
Communication Methods

Quantum networks must classically exchange complex metadata between devices in order to carry out information for protocols such as teleportation, super-dense coding, and quantum key distribution. Demonstrating the integration of these new communication methods with existing network protocols, channels, and data forwarding mechanisms remains an open challenge. Software-defined networking (SDN) offers robust and flexible strategies for managing diverse network devices and uses. We adapt the principles of SDN to the deployment of quantum networks, which are composed from unique devices that operate according to the laws of quantum mechanics. We show how quantum metadata can be managed within a software-defined network using the OpenFlow protocol, and we describe how OpenFlow management of classical optical channels is compatible with emerging quantum communication protocols. We next give an example specification of the metadata needed to manage and control quantum physical layer (QPHY) behavior and we extend the OpenFlow interface to accommodate this quantum metadata. We conclude by discussing near-term experimental efforts that can realize SDN’s principles for quantum communication.

scholarly journals Parameter regimes for surpassing the PLOB bound with error-corrected qudit repeaters

Quantum ◽  
2019 ◽  
Vol 3 ◽  
pp. 216 ◽  
Author(s):  
Daniel Miller ◽  
Timo Holz ◽  
Hermann Kampermann ◽  
Dagmar Bruß
Keyword(s):  
Secure Communication ◽  
Quantum Communication ◽  
Quantum Repeater ◽  
Long Distance ◽  
Quantum Networks ◽  
Quantum Capacity ◽  
Higher Dimensional ◽  
Quantum Repeaters ◽  
New Applications ◽  
Provably Secure

A potential quantum internet would open up the possibility of realizing numerous new applications, including provably secure communication. Since losses of photons limit long-distance, direct quantum communication and wide-spread quantum networks, quantum repeaters are needed. The so-called PLOB-repeaterless bound [Pirandola et al., Nat. Commun. 8, 15043 (2017)] is a fundamental limit on the quantum capacity of direct quantum communication. Here, we analytically derive the quantum-repeater gain for error-corrected, one-way quantum repeaters based on higher-dimensional qudits for two different physical encodings: Fock and multimode qudits. We identify parameter regimes in which such quantum repeaters can surpass the PLOB-repeaterless bound and systematically analyze how typical parameters manifest themselves in the quantum-repeater gain. This benchmarking provides a guideline for the implementation of error-corrected qudit repeaters.

scholarly journals Drone-based entanglement distribution towards mobile quantum networks

2020 ◽  
Vol 7 (5) ◽  
pp. 921-928 ◽  
Author(s):  
Hua-Ying Liu ◽  
Xiao-Hui Tian ◽  
Changsheng Gu ◽  
Pengfei Fan ◽  
Xin Ni ◽  
...  
Keyword(s):  
Quantum Communication ◽  
Single Mode ◽  
Cost Effective ◽  
Local Area ◽  
Single Mode Fiber ◽  
Full Time ◽  
Mobile Platforms ◽  
Quantum Networks ◽  
Entanglement Distribution ◽  
Scalable Design

Abstract Satellites have shown free-space quantum-communication ability; however, they are orbit-limited from full-time all-location coverage. Meanwhile, practical quantum networks require satellite constellations, which are complicated and expensive, whereas the airborne mobile quantum communication may be a practical alternative to offering full-time all-location multi-weather coverage in a cost-effective way. Here, we demonstrate the first mobile entanglement distribution based on drones, realizing multi-weather operation including daytime and rainy nights, with a Clauser-Horne-Shimony-Holt S-parameter measured to be 2.41 ± 0.14 and 2.49 ± 0.06, respectively. Such a system shows unparalleled mobility, flexibility and reconfigurability compared to the existing satellite and fiber-based quantum communication, and reveals its potential to establish a multinode quantum network, with a scalable design using symmetrical lens diameter and single-mode-fiber coupling. All key technologies have been developed to pack quantum nodes into lightweight mobile platforms for local-area coverage, and arouse further technical improvements to establish wide-area quantum networks with high-altitude mobile communication.

scholarly journals Multiphoton quantum communication in quantum networks

2014 ◽  
Vol 89 (6) ◽  
Author(s):  
Wei Qin ◽  
Chuan Wang ◽  
Ye Cao ◽  
Gui Lu Long
Keyword(s):  
Quantum Communication ◽  
Quantum Networks

scholarly journals Experimental quantum conference key agreement

2021 ◽  
Vol 7 (23) ◽  
pp. eabe0395
Author(s):  
Massimiliano Proietti ◽  
Joseph Ho ◽  
Federico Grasselli ◽  
Peter Barrow ◽  
Mehul Malik ◽  
...  
Keyword(s):  
Secure Communication ◽  
Key Agreement ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Global Scale ◽  
Low Noise ◽  
Long Distance ◽  
Quantum Networks ◽  
High Brightness ◽  
Ghz States

Quantum networks will provide multinode entanglement enabling secure communication on a global scale. Traditional quantum communication protocols consume pair-wise entanglement, which is suboptimal for distributed tasks involving more than two users. Here, we demonstrate quantum conference key agreement, a cryptography protocol leveraging multipartite entanglement to efficiently create identical keys between N users with up to N-1 rate advantage in constrained networks. We distribute four-photon Greenberger-Horne-Zeilinger (GHZ) states, generated by high-brightness telecom photon-pair sources, over optical fiber with combined lengths of up to 50 km and then perform multiuser error correction and privacy amplification. Under finite-key analysis, we establish 1.5 × 106 bits of secure key, which are used to encrypt and securely share an image between four users in a conference transmission. Our work highlights a previously unexplored protocol tailored for multinode networks leveraging low-noise, long-distance transmission of GHZ states that will pave the way for future multiparty quantum information processing applications.

scholarly journals Optomechanical interfaces for hybrid quantum networks

2015 ◽  
Vol 2 (4) ◽  
pp. 510-519 ◽  
Author(s):  
Chunhua Dong ◽  
Yingdan Wang ◽  
Hailin Wang
Keyword(s):  
Degrees Of Freedom ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Quantum Systems ◽  
Optical Control ◽  
Special Role ◽  
Mechanical Motion ◽  
Optical Fields ◽  
Quantum Networks ◽  
Optical Resonances

Abstract Recent advances on optical control of mechanical motion in an optomechanical resonator have stimulated strong interests in exploring quantum behaviors of otherwise classical, macroscopic mechanical systems and especially in exploiting mechanical degrees of freedom for applications in quantum information processing. In an optomechanical resonator, an optically- active mechanical mode can couple to any of the optical resonances supported by the resonator via radiation pressure. This unique property leads to a remarkable phenomenon: mechanically-mediated conversion of optical fields between vastly different wavelengths. The resulting optomechanical interfaces can play a special role in a hybrid quantum network, enabling quantum communication between disparate quantum systems. In this review, we introduce the basic concepts of optomechanical interactions and discuss recent theoretical and experimental progresses in this field. A particular emphasis is on taking advantage of mechanical degrees of freedom, while avoiding detrimental effects of thermal mechanical motion.

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