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Experimental test of nonclassicality with arbitrary low detection efficiency
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.ORCID-id: 0000-0002-3031-1227
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Universidade de São Paulo, Brazil.
Vise andre og tillknytning
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
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.

Emneord [en]
Quantum information, Quantum communciation, semi-device independent
HSV kategori
Forskningsprogram
fysik
Identifikatorer
URN: urn:nbn:se:su:diva-139086OAI: oai:DiVA.org:su-139086DiVA, id: diva2:1071079
Forskningsfinansiär
Swedish Research CouncilTilgjengelig fra: 2017-02-03 Laget: 2017-02-03 Sist oppdatert: 2022-02-28bibliografisk kontrollert
Inngår i avhandling
1. Single Photon Sources and Single Quantum System enabled Communication
Åpne denne publikasjonen i ny fane eller vindu >>Single Photon Sources and Single Quantum System enabled Communication
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Department of Physics, Stockholm University, 2017. s. 122
Emneord
quantum information, quantum optics, quantum communication, single photon sources
HSV kategori
Forskningsprogram
fysik
Identifikatorer
urn:nbn:se:su:diva-139095 (URN)978-91-7649-708-1 (ISBN)978-91-7649-709-8 (ISBN)
Disputas
2017-03-27, Lecture hall FB42, Albanova University Center, Roslagstullsbacken 21, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

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.

Tilgjengelig fra: 2017-03-02 Laget: 2017-02-03 Sist oppdatert: 2022-02-28bibliografisk kontrollert

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