Quantum dot technology for quantum repeaters: from entangled photon generation toward the integration with quantum memories

Neuwirth, Julia; Basset, Francesco Basso; Rota, Michele B.; Roccia, Emanuele; Schimpf, Christian; Jöns, Klaus D.; Rastelli, Armando; Trotta, Rinaldo

doi:10.1088/2633-4356/ac3d14

Cited by 23 publications

(8 citation statements)

References 224 publications

(249 reference statements)

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“…For an in‐depth discussion of this topic, we refer the interested reader to ref. [405]. In future work the efficiency and the signal‐to‐noise ratio must be further improved to allow for the on‐demand storage and retrieval of QD single photons.…”

Section: Recent Progress On Building Blocks For Quantum Networkmentioning

confidence: 99%

Quantum Communication Using Semiconductor Quantum Dots

et al. 2022

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Worldwide, enormous efforts are directed toward the development of the so-called quantum internet. Turning this long-sought-after dream into reality is a great challenge that will require breakthroughs in quantum communication and computing. To establish a global, quantum-secured communication infrastructure, photonic quantum technologies will doubtlessly play a major role, by providing and interfacing essential quantum resources, for example, flying-and stationary qubits or quantum memories. Over the last decade, significant progress has been made in the engineering of on-demand quantum light sources based on semiconductor quantum dots, which enable the generation of close-to-ideal single-and entangled-photon states, useful for applications in quantum information processing. This review focuses on implementations of, and building blocks for, quantum communication using quantum-light sources based on epitaxial semiconductor quantum dots. After reviewing the main notions of quantum communication and introducing the devices used for single-photon and entangled-photon generation, an overview of experimental implementations of quantum key distribution protocols using quantum dot based quantum light sources is provided. Furthermore, recent progress toward quantum-secured communication networks as well as building blocks thereof is summarized. The article closes with an outlook, discussing future perspectives in the field and identifying the main challenges to be solved.

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Section: Recent Progress On Building Blocks For Quantum Networkmentioning

confidence: 99%

Quantum Communication Using Semiconductor Quantum Dots

et al. 2022

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“…Since not every pulse emitted by a real QD contains a photon, memories also require low noise backgrounds so that it is possible to distinguish a retrieved photon from the noise floor. In the following, we will review recent advances in quantum memories compatible with QDs (see also Neuwirth et al [275] for an in-depth review).…”

Section: Quantum Memorymentioning

confidence: 99%

Quantum Communication Using Semiconductor Quantum Dots

Vajner,

Rickert,

Gao

et al. 2021

Preprint

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Worldwide enormous efforts are directed towards the development of the so-called quantum internet. Turning this long sought-after dream into reality is a great challenge that will require breakthroughs in quantum communication and computing. To establish a global, quantum-secured communication infrastructure, photonic quantum technologies will doubtlessly play a major role, by providing and interfacing essential quantum resources, e.g., flying-and stationary qubits or quantum memories. Over the last decade, significant progress has been made in the engineering of on-demand quantum light sources based on semiconductor Quantum Dots, which enable the generation of close-to-ideal singleand entangled-photon states, useful for quantum cryptography tasks. This review focuses on implementations of, and building blocks for, quantum communication using quantum-light sources based on epitaxial semiconductor quantum dots. After reviewing the main notions of quantum cryptography (section 1) and introducing the devices used for single-photon and entangled-photon generation (section 2), it provides an overview of experimental implementations of cryptographic protocols using quantum dot based quantum light sources (section 3). Furthermore, recent progress towards quantum-secured communication networks as well as building blocks thereof is summarized (section 4). The article closes with an outlook, discussing future perspectives in the field and identifying the main challenges to be solved.

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“…In particular, the inherent spectral inhomogeneity in ensembles of solid-state matter-based qubits such as quantum dots (QDs) makes it necessary to tune the optical transitions of matter-based qubits into resonance with PhC modes. For example, InAs QDs are one of the brightest sources of single photons, − can host optically addressable spin-based matter qubits, − and have been used for both remote two-photon interference and quantum repeaters. , However, ensembles of InAs QDs have inherent inhomogeneity due to the presence of random diffusion in the Stranski–Krastanov method used in their growth . While strong coupling of InAs QDs to PhC cavities has been demonstrated, − these demonstrations require the use of some external tuning parameter, e.g., temperature, to overcome the energy difference between the optical transition of the QD and the resonant mode of the as-fabricated PhC cavity. − One important step toward overcoming this challenge has been the use of QD molecules (QDMs) in which applied electric fields can more easily tune the optical transitions into resonance with the PhC cavity mode. ,, …”

Section: Introductionmentioning

confidence: 99%

Computational Design of a Split Cavity with Localized Independent Electric Field Tunability

Carfagno,

Herrmann,

Wang

et al. 2023

ACS Photonics

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Cavity-mediated strong coupling is an essential element for quantum photonic technologies, but there are multiple challenges to creating scalable device platforms in which multiple matter-based qubits can be strongly coupled to a single cavity. Among these challenges is the inherent inhomogeneity in ensembles of matter-based qubits, which necessitates independent tuning of each qubit into resonance with the mode of the cavity. We present a new design for a photonic crystal split cavity that enables independent electric field tuning of two distinct qubits based on indium arsenide quantum dots in a gallium arsenide heterostructure. Using finite difference time domain simulations, we alter the cavity geometry and the local arrangement of photonic crystal holes to optimize the cavity quality factor. We achieve a simulated quality factor of 20,000, which is comparable to values that have been used to demonstrate strong coupling. We further show that distinct electric fields can be applied to the two qubits with negligible cross talk. The result demonstrates the viability of a new approach to coupling multiple qubits to a single cavity and opens the door for both further numerical optimization and experimental realization of this new paradigm.

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Quantum dot technology for quantum repeaters: from entangled photon generation toward the integration with quantum memories

Cited by 23 publications

References 224 publications

Quantum Communication Using Semiconductor Quantum Dots

Quantum Communication Using Semiconductor Quantum Dots

Quantum Communication Using Semiconductor Quantum Dots

Computational Design of a Split Cavity with Localized Independent Electric Field Tunability

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