Quantum Key Distribution using Deterministic Single-Photon Sources over a Field-Installed Fibre Link

Zahidy, Mujtaba; Mikkelsen, Mikkel T.; Müller, Ronny; Lio, Beatrice Da; Krehbiel, Martin; Wang, Ying; Galili, Michael; Forchhammer, Søren; Lodahl, Peter; Oxenløwe, Leif Katsuo; Bacco, Davide; Midolo, Leonardo

doi:10.48550/arxiv.2301.09399

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…[34] using an electrically driven InAs quantum dot (5-17 kbits/s at 125 MHz clock rate), and a factor 270× less than that reported in Ref. [18] using InP and InAs quantum dots (27)(28)(29)(30)(31)(32)(33)(34)(35) kbit/s at 182.6 MHz clock rate). Furthermore, recent experiments have performed QKD with frequency-converted quantum dot SPSs over longer distances, achieving 1-689 kbits/s depending on fiber length at 160 MHz clock rate in Ref.…”

Section: Resultsmentioning

confidence: 72%

Quantum Key Distribution Using a Quantum Emitter in Hexagonal Boron Nitride

et al. 2023

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Quantum key distribution (QKD) is considered the most immediate application to be widely implemented among a variety of potential quantum technologies. QKD enables sharing secret keys between distant users by using photons as information carriers. An ongoing endeavor is to implement these protocols in practice in a robust, and compact manner so as to be efficiently deployable in a range of real‐world scenarios. Single photon sources (SPS) in solid‐state materials are prime candidates in this respect. This article demonstrates a room temperature, discrete‐variable quantum key distribution system using a bright single photon source in hexagonal‐boron nitride, operating in free‐space. Employing an easily interchangeable photon source system, keys with one million bits length, and a secret key of approximately 70000 bits, at a quantum bit error rate of 6%, with ε‐security of 10−10 are generated. This study demonstrates the first proof of concept finite‐key BB84 QKD system realized with hBN defects.

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Section: Resultsmentioning

confidence: 72%

Quantum Key Distribution Using a Quantum Emitter in Hexagonal Boron Nitride

et al. 2023

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“…Self-assembled QDs [78,102] and Er ions [94] have also reached very competitive BPI-values in this integrated cavity approach, and seminal implementations in TMDs [175,193] and hBN [238,326] have been demonstrated recently, yet less performant than their versions in Fabry-Pérot cavities, as mentioned before. Further interesting developments in terms of shaping the photonic environment of single photon emitters include magneto-optical structures enabling single photon emission with well-defined orbital angular momenta.…”

Section: Discussionmentioning

confidence: 91%

“…[51,52,78,[95][96][97] Relevant applications in quantum communication and computation have been demonstrated (a review on this matter can be consulted, for example, in Refs. [98,99]), such as the fiber-based remote interference over hundreds of kilometers, [100] hundreds of meters free-spacebased [101] and kilometre-scale fiber-based metropolitan quantum key distribution demonstrations in the telecom range [102,103] (protocols where photon-interference is not required). Notably, the growth control on QDs has allowed to achieve large values of indistinguishability between photons emitted from two separate sources [104] and coupling effects among identical emitters, [105][106][107] holding the promise to reproducibly scale-up the technology.…”

Section: A Leading Solid-state Platform: Self-assembled Semiconductor...mentioning

confidence: 99%

Solid‐State Single‐Photon Sources: Recent Advances for Novel Quantum Materials

Esmann,

Wein,

Antón‐Solanas

2024

Adv Funct Materials

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In this review, the current landscape of emergent quantum materials for quantum photonic applications is described. The review focuses on three specific solid‐state platforms: single emitters in monolayers of transition metal dichalcogenides (TMDs), defects in hexagonal boron nitride (hBN), and colloidal quantum dots in perovskites (PQDs). These platforms share a unique technological accessibility, enabling the rapid implementation of testbed quantum applications, all while being on the verge of becoming technologically mature enough for a first generation of real‐world quantum applications. The review begins with a comprehensive overview of the current state‐of‐the‐art for relevant single‐photon sources in the solid‐state, introducing the most important performance criteria and experimental characterization techniques along the way. Progress for each of the three novel materials is then benchmarked against more established (yet complex) platforms, highlighting performance, material‐specific advantages, and giving an outlook on quantum applications. This review will thus provide the reader with a snapshot on latest developments in the fast‐paced field of emergent single‐photon sources in the solid‐state, including all the required concepts and experiments relevant to this technology.

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Quantum dots for photonic quantum information technology

Heindel¹,

Kim²,

Gregersen³

et al. 2023

Adv. Opt. Photon.

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The generation, manipulation, storage, and detection of single photons play a central role in emerging photonic quantum information technology. Individual photons serve as flying qubits and transmit the relevant quantum information at high speed and with low losses, for example between individual nodes of quantum networks. Due to the laws of quantum mechanics, the associated quantum communication is fundamentally tap-proof, which explains the enormous interest in this modern information technology. On the other hand, stationary qubits or photonic states in quantum computers can potentially lead to enormous increases in performance through parallel data processing, to outperform classical computers in specific tasks when quantum advantage is achieved. In this review, we discuss in depth the great potential of semiconductor quantum dots in photonic quantum information technology. In this context, quantum dots form a key resource for the implementation of quantum communication networks and photonic quantum computers, because they can generate single photons on demand. Moreover, these solid-state quantum emitters are compatible with the mature semiconductor technology, so that they can be integrated comparatively easily into nanophotonic structures such as resonators and waveguide systems, which form the basis for quantum light sources and integrated photonic quantum circuits. After a thematic introduction, we present modern numerical methods and theoretical approaches to device design and the physical description of quantum dot devices. We then introduce modern methods and technical solutions for the epitaxial growth and for the deterministic nanoprocessing of quantum devices based on semiconductor quantum dots. Furthermore, we highlight the most promising device concepts for quantum light sources and photonic quantum circuits that include single quantum dots as active elements and discuss applications of these novel devices in photonic quantum information technology. We close with an overview of open issues and an outlook on future developments.

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Quantum Key Distribution using Deterministic Single-Photon Sources over a Field-Installed Fibre Link

Cited by 3 publications

References 32 publications

Quantum Key Distribution Using a Quantum Emitter in Hexagonal Boron Nitride

Quantum Key Distribution Using a Quantum Emitter in Hexagonal Boron Nitride

Solid‐State Single‐Photon Sources: Recent Advances for Novel Quantum Materials

Quantum dots for photonic quantum information technology

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