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Distributed random access code with quantum resources
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-3031-1227
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Collaborative communication tasks as random access codes (RACs) employing quantum resources have manifested great potential in enhancing information processing capabilities beyond the classical limitations. The two quantum variants of RACs, namely quantum random access code (QRAC) and the entanglement assisted random access code (EARAC), have demonstrated equal prowess for a number of tasks. However, there do exist specific cases where one outperforms the other. In this letter, we study a family of 3 to 1 distributed RACs, which are the simplest communication network of that type. We present its construction of both the QRAC and the EARAC. We demonstrate that, depending on the task, if QRAC achieves the maximal success probability then the EARAC fails to do so and vice versa. Moreover, a tripartite Bell-type inequality associated with the EARAC variants reveals the genuine multipartite nonlocality exhibited by our protocol. We conclude with an experimental realization of the 3 to 1 distributed QRAC that achieves higher success probabilities than the maximum possible with EARACs for a number of tasks.

Keyword [en]
quantum information, quantum communication, superposition, single photons
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-139087OAI: oai:DiVA.org:su-139087DiVA: diva2:1071081
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2017-02-03 Created: 2017-02-03 Last updated: 2017-02-15Bibliographically approved
In thesis
1. Single Photon Sources and Single Quantum System enabled Communication
Open this publication in new window or tab >>Single Photon Sources and Single Quantum System enabled Communication
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Quantum information is a highly interesting and fast emerging field that involves processing information encoded into quantum systems and their subsequent use in various information tasks. The use of quantum resources such as superposition and entanglement have shown to enhance information processing capabilities beyond classical means in a number of communication, information and computation tasks. In this thesis, we have used single photons to study the advantage of d-level quantum systems (qudits) for a communication task commonly known as random access codes (RACs). A successful experimental demonstration of quantum random access codes (QRACs) with four dimensions is realized to demonstrate that the higher dimensional QRACs not only outperform the classical RACs but also provide an advantage over their quantum bit (qubit) counterparts. QRACs are also studied in regards to two specific applications: certification of true randomness and for testing the non-classicality of quantum systems. A method for increased certification of generated randomness is realized for the former and a successful experimental demonstration of a test of non-classicality with arbitrarily low detection efficiency is provided for the latter. This is followed by an implementation of a QRAC in a one-path communication network consisting of preparation, transformation and measurement devices. We have shown that the distributed QRAC provides optimal success probabilities for a number of tasks. Moreover, a novel quantum protocol for the solution to the problem of dining cryptographers and anonymous veto voting is also presented. This single photon transmission based protocol provides an efficient solution, which is experimentally demonstrated for a 3-party description. Lastly, Nitrogen-Vacancy (NV) center in diamond is studied as a potential resource for single photon emission and two methods to enhance the photon collection efficiency are successfully explored. Due to this enhancement, single photons from an NV center may also be used in similar single quantum system based communication experiments.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2017. 122 p.
Keyword
quantum information, quantum optics, quantum communication, single photon sources
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-139095 (URN)978-91-7649-708-1 (ISBN)978-91-7649-709-8 (ISBN)
Public defence
2017-03-27, Lecture hall FB42, Albanova University Center, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript. Paper 5: Manuscript.

Available from: 2017-03-02 Created: 2017-02-03 Last updated: 2017-04-03Bibliographically approved

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