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Single Photon Sources and Single Quantum System enabled Communication
Stockholm University, Faculty of Science, Department of Physics. (Kvantinformation och Kvantoptik)ORCID iD: 0000-0002-3031-1227
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. , p. 122
Keyword [en]
quantum information, quantum optics, quantum communication, single photon sources
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-139095ISBN: 978-91-7649-708-1 (print)ISBN: 978-91-7649-709-8 (electronic)OAI: oai:DiVA.org:su-139095DiVA, id: diva2:1071103
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
List of papers
1. Quantum Random Access Codes Using Single d-Level Systems
Open this publication in new window or tab >>Quantum Random Access Codes Using Single d-Level Systems
2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 17, article id 170502Article in journal (Refereed) Published
Abstract [en]

Random access codes (RACs) are used by a party to, with limited communication, access an arbitrary subset of information held by another party. Quantum resources are known to enable RACs that break classical limitations. Here, we study quantum and classical RACs with high-level communication. We derive average performances of classical RACs and present families of high-level quantum RACs. Our results show that high-level quantum systems can significantly increase the advantage of quantum RACs over their classical counterparts. We demonstrate our findings in an experimental realization of a quantum RAC with four-level communication.

National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-117717 (URN)10.1103/PhysRevLett.114.170502 (DOI)000353637900001 ()
Available from: 2015-06-12 Created: 2015-06-01 Last updated: 2017-12-04Bibliographically approved
2. Increased certification of semi-device independent random numbers using many inputs and more post-processing
Open this publication in new window or tab >>Increased certification of semi-device independent random numbers using many inputs and more post-processing
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2016 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 18, article id 065004Article in journal (Refereed) Published
Abstract [en]

Quantum communication with systems of dimension larger than two provides advantages in information processing tasks. Examples include higher rates of key distribution and random number generation. The main disadvantage of using such multi-dimensional quantum systems is the increased complexity of the experimental setup. Here, we analyze a not-so-obvious problem: the relation between randomness certification and computational requirements of the post-processing of experimental data. In particular, we consider semi-device independent randomness certification from an experiment using a four dimensional quantum system to violate the classical bound of a random access code. Using state-of-the-art techniques, a smaller quantum violation requires more computational power to demonstrate randomness, which at some point becomes impossible with today's computers although the randomness is (probably) still there. We show that by dedicating more input settings of the experiment to randomness certification, then by more computational postprocessing of the experimental data which corresponds to a quantum violation, one may increase the amount of certified randomness. Furthermore, we introduce a method that significantly lowers the computational complexity of randomness certification. Our results show how more randomness can be generated without altering the hardware and indicate a path for future semi-device independent protocols to follow.

Keyword
quantum information, randomness, device independence
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-132409 (URN)10.1088/1367-2630/18/6/065004 (DOI)000379291400001 ()
Available from: 2016-08-12 Created: 2016-08-11 Last updated: 2017-11-28Bibliographically approved
3. Experimental test of nonclassicality with arbitrary low detection efficiency
Open this publication in new window or tab >>Experimental test of nonclassicality with arbitrary low detection efficiency
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

We theoretically introduce and experimentally demonstrate the realization of a nonclassicality test that allows for arbitrarily low detection efficiency without invoking any extra assumptions as independence of the devices. Our test and its implementation is set in a prepare-and-measure scenario with an upper limit on the communication capacity of the channel through which the systems are communicated. The essence for our novel test is the use of two preparation and two measurement devices, which are randomly paired in each round. Our work opens up the possibility of experimental realizations of device independent protocols with current off-the-shelf technology.

Keyword
Quantum information, Quantum communciation, semi-device independent
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-139086 (URN)
Funder
Swedish Research Council
Available from: 2017-02-03 Created: 2017-02-03 Last updated: 2017-02-15Bibliographically approved
4. Distributed random access code with quantum resources
Open this publication in new window or tab >>Distributed random access code with quantum resources
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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
quantum information, quantum communication, superposition, single photons
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-139087 (URN)
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2017-02-03 Created: 2017-02-03 Last updated: 2017-02-15Bibliographically approved
5. Experimental quantum solution to the Dining Cryptographers Problem
Open this publication in new window or tab >>Experimental quantum solution to the Dining Cryptographers Problem
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Quantum resources such as superposition and entanglement have been used to provide unconditional key distribution, secret sharing and communication complexity reduction. In this letter we present a novel quantum information protocol for dining cryptographers problem and anonymous vote casting by a group of voters. We successfully demonstrate the experimental realization of the protocol using single photon transmission. Our implementation employs a flying particle scheme where a photon passes by the voters who perform a sequence of actions (unitary transformations) on the photonic state at their local stations.

Keyword
quantum information, quantum communication, cryptography, single photons
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-139089 (URN)
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2017-02-03 Created: 2017-02-03 Last updated: 2017-02-15Bibliographically approved

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