Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

NeuroQuantology

Experimental Approach Towards Long-Range Interactions from 1.6 to 13798 km Distances in Bio-Hybrid Systems

Serge Kernbach, Vitaliy Zamsha, Yuri Kravchenko

Published Mar 6, 2016• 3 citations
Publisher

Abstract

This work describes performed experiments on device-device and ope¬rator-device interactions at distances of >1 km, >100 km and >10000 km. Experimental setup involves several types of receiving sensors and transmitting optical generators as well as a group of human operators. We analyzed the structure of setup, establishing a connection between receiver and emitter, and multiple effects appeared. The experiments suggest a common character of operator- and device- interactions that point to possible ’neuro-quantum mechanisms’ underling both systems. This approach replicates and extends early experiments from 80x and 90x, and can be considered as a novel unconventional communication system.

DOI
10.14704/nq.2016.14.3.917

Related papers

Investigation of Photon Interactions with Semiconductor Quantum Dot Devices for Quantum Communication Applications

Jason Phoenix

A major goal in the field of quantum communication is to achieve long-distance (>100 km) transmission of quantum information, which would allow for the formation of a global quantum network. Devices called 'quantum repeaters' will enable delicate quantum states to be transmitted over long distances without succumbing to the signal losses inherent in the use of optical fibres. This thesis presents my work on a new type of hybrid quantum repeater design, which will combine both the photonic and spin qubit platforms to achieve more robust and efficient quantum communication. The focus of this work is on the optical aspects of this 'photon-to-spin' system, specifically the development of a method for delivering fibre-coupled single photons through an optical fibre to a lateral quantum dot device in a dilution refrigerator while preserving their polarisation states.

•Jan 21, 2020•0 citations

Long-distance Bell-type tests using energy-time entangled photons

Wolfgang Tittel, Jurgen Brendel, Nicolas Gisin +1 more

Long-distance Bell-type experiments are presented. The different experimental challenges and their solutions in order to maintain the strong quantum correlations between energy-time entangled photons over more than 10 km are reported and the results analyzed from the point of view of tests of fundamental physics as well as from the more applied side of quantum communication, especially quantum key distribution. Tests using more than one analyzer on each side are also presented.

arXiv:quant-ph/9809025•Physical Review A•Jun 1, 1999•141 citations

Hybrid quantum repeater for qudits

Marcel Bergmann, Peter van Loock

We present a hybrid quantum repeater protocol for the long-distance distribution of atomic entangled states beyond qubits. In our scheme, imperfect noisy entangled pairs of two qudits, i.e., two discrete-variable $d$-level systems, each of, in principle, arbitrary dimension $d$, are initially shared between the intermediate stations of the channel. This is achieved via local, sufficiently strong light-matter interactions, involving optical coherent states and their transmission after these interactions, and optical measurements on the transmitted field modes, especially efficient continuous-variable homodyne detections (``hybrid'' here refers to the simultaneous exploitation of discrete- and continuous-variable degrees of freedom for the local processing and storage of entangled states as well as their nonlocal distribution, respectively) and unambiguous state discrimination. For qutrits we quantify the light-matter entanglement that can be effectively shared through an elementary lossy channel, and for a repeater spacing of up to 10 km we show that the realistic (lossy) qutrit entanglement is even larger than any ideal (loss-free) qubit entanglement. After including qudit entanglement purification and swapping procedures, we calculate the long-distance entangled-pair distribution rates and the final entangled-state fidelities for total communication distances of up to 1280 km. For example, employing unambiguous state discrimination, with three rounds of purification, entangled qudit pairs of near-unit fidelity can be distributed over 1280 km at an ideal maximal rate (assuming perfect gate operations) on the order of 100 Hz.

arXiv:1708.09322•Physical Review A•Mar 29, 2019•25 citations

Towards long-distance quantum communication

Marc Almendros

This dissertation reports on an experimental quantum optics project performed in the group of Prof. Jurgen Eschner at ICFO - The Institute of Photonic Sciences in Spain, to advance in the research of long-distance quantum communications. It describes in detail several crucial engineering contributions to the project and puts them in the framework of the physical background and of the first successful proof-of-principle experiments. The document starts with an introduction about long-distance quantum communication, discussing some of its applications and its state of the art, and introducing the different scenarios to create distant entanglement with an apparatus like the one presented here. Then, it follows the technical description of the setup, which is the main part of the document. This is consistent with the percentage of time of the PhD dedicated to its design and construction, because the experiment was started from scratch. This technical description has a small part which explains all the work the group has done as a team, e.g. the vacuum setup and the laser system, and then it focuses in my individual contribution to this technical work, with the Cavity Locker and the pulse sequencer called Hydra. The latter is a highly complex project which took two years of development, and consequently it occupies the biggest portion of this document. After the technical description, the first operations with single trapped ions are explained, finishing with an implementation of a bandwidth-tunable single-photon source for quantum networking applications. The experimental setup consists of two ions traps -so far the only ones in Spain, and one out of a handful similar setups worldwide- located in two different vacuum chambers which are separated by approximately one meter of distance. In each apparatus, single trapped ions are manipulated with laser light, allowing us to control the energy level of their valence electron to perform quantum information processing. One main goal of the experiment is to create entanglement between two distant ions -one in each trap-, a mandatory resource to perform quantum communications between them. Therefore, each vacuum chamber can be understood as a transceiver, or node, in a quantum network scenario. Such a network could be used, for example, to create more secure communication links using quantum cryptography; or to extend the power of two quantum processors located at a distance by means of the interchange of quantum information between them, e.g. using quantum teleportation. The quantum transceiver technology studied in this thesis will also help establishing the basis for space-based quantum communication links using satellites, enabling the creation of global quantum networks in a not too far future.

•Jan 1, 2010•1 citation

High-Rate Measurement-Device-Independent Quantum Communication without Optical Reference Light

Shan-Feng Shao, Lai Zhou, Jinping Lin +7 more

In the realm of long-distance quantum communication, asynchronous measurement-device-independent quantum key distribution (AMDI-QKD) stands out for its experimental simplicity and high key rate generation. Despite these advantages, there exists a challenge in finding a balance between simplifying the laser system further and achieving high key rates. To address this challenge, we have devised a postmeasurement compensation scheme to accurately estimate the mutual frequency offset between two compact lasers using just the announced quantum-signal detection results, thereby obviating the need for optical reference light. As a result, we demonstrate an AMDI-QKD system operating at 2.5 GHz and achieving secure key rates (SKRs) of 537 and 101 kbit / s at distances of 100 and 201 km, respectively, showcasing a significant key rate improvement compared to similar setups. By leveraging ultrastable lasers, we achieve the highest SKRs with measurement-device-independent security within the 100–400-km range. Over 100 km, we reach a remarkable key rate of 1.03 Mbit / s , which could enable real-time one-time-pad video encryption. These findings render AMDI-QKD as a promising contender for the establishment of high performance and cost-effective large-scale intercity quantum networks.

Physical Review X•May 23, 2025•28 citations

Experimental studies toward the Quantum Communications with orbiting terminals

Andrea Tomaello, Alberto Dall’Arche, Francesca Gerlin +3 more

Realization of Quantum Communications in Space requires a deep understanding of issues including link-budget, turbulence mitigation and single-photon terminal synchro-nization. Here we report on supporting novel experiments on very long-distance links and modeling.

Research in Optical Sciences•Jan 1, 2012•0 citations
This work describes performed experiments on device-device and ope¬rator-device interactions at distances of >1 km, >100 km and >10000 km. Experimental setup involves several types of receiving sensors and transmitting optical generators as well as a group of human operators. We analyzed the structure of setup, establishing a connection between receiver and emitter, and multiple effects appeared. The experiments suggest a common character of operator- and device- interactions that point to possible ’neuro-quantum mechanisms’ underling both systems. This approach replicates and extends early experiments from 80x and 90x, and can be considered as a novel unconventional communication system.
A major goal in the field of quantum communication is to achieve long-distance (>100 km) transmission of quantum information, which would allow for the formation of a global quantum network. Devices called 'quantum repeaters' will enable delicate quantum states to be transmitted over long distances without succumbing to the signal losses inherent in the use of optical fibres. This thesis presents my work on a new type of hybrid quantum repeater design, which will combine both the photonic and spin qubit platforms to achieve more robust and efficient quantum communication. The focus of this work is on the optical aspects of this 'photon-to-spin' system, specifically the development of a method for delivering fibre-coupled single photons through an optical fibre to a lateral quantum dot device in a dilution refrigerator while preserving their polarisation states.
We present a hybrid quantum repeater protocol for the long-distance distribution of atomic entangled states beyond qubits. In our scheme, imperfect noisy entangled pairs of two qudits, i.e., two discrete-variable ddd-level systems, each of, in principle, arbitrary dimension ddd, are initially shared between the intermediate stations of the channel. This is achieved via local, sufficiently strong light-matter interactions, involving optical coherent states and their transmission after these interactions, and optical measurements on the transmitted field modes, especially efficient continuous-variable homodyne detections (``hybrid'' here refers to the simultaneous exploitation of discrete- and continuous-variable degrees of freedom for the local processing and storage of entangled states as well as their nonlocal distribution, respectively) and unambiguous state discrimination. For qutrits we quantify the light-matter entanglement that can be effectively shared through an elementary lossy channel, and for a repeater spacing of up to 10 km we show that the realistic (lossy) qutrit entanglement is even larger than any ideal (loss-free) qubit entanglement. After including qudit entanglement purification and swapping procedures, we calculate the long-distance entangled-pair distribution rates and the final entangled-state fidelities for total communication distances of up to 1280 km. For example, employing unambiguous state discrimination, with three rounds of purification, entangled qudit pairs of near-unit fidelity can be distributed over 1280 km at an ideal maximal rate (assuming perfect gate operations) on the order of 100 Hz.
This dissertation reports on an experimental quantum optics project performed in the group of Prof. Jurgen Eschner at ICFO - The Institute of Photonic Sciences in Spain, to advance in the research of long-distance quantum communications. It describes in detail several crucial engineering contributions to the project and puts them in the framework of the physical background and of the first successful proof-of-principle experiments. The document starts with an introduction about long-distance quantum communication, discussing some of its applications and its state of the art, and introducing the different scenarios to create distant entanglement with an apparatus like the one presented here. Then, it follows the technical description of the setup, which is the main part of the document. This is consistent with the percentage of time of the PhD dedicated to its design and construction, because the experiment was started from scratch. This technical description has a small part which explains all the work the group has done as a team, e.g. the vacuum setup and the laser system, and then it focuses in my individual contribution to this technical work, with the Cavity Locker and the pulse sequencer called Hydra. The latter is a highly complex project which took two years of development, and consequently it occupies the biggest portion of this document. After the technical description, the first operations with single trapped ions are explained, finishing with an implementation of a bandwidth-tunable single-photon source for quantum networking applications. The experimental setup consists of two ions traps -so far the only ones in Spain, and one out of a handful similar setups worldwide- located in two different vacuum chambers which are separated by approximately one meter of distance. In each apparatus, single trapped ions are manipulated with laser light, allowing us to control the energy level of their valence electron to perform quantum information processing. One main goal of the experiment is to create entanglement between two distant ions -one in each trap-, a mandatory resource to perform quantum communications between them. Therefore, each vacuum chamber can be understood as a transceiver, or node, in a quantum network scenario. Such a network could be used, for example, to create more secure communication links using quantum cryptography; or to extend the power of two quantum processors located at a distance by means of the interchange of quantum information between them, e.g. using quantum teleportation. The quantum transceiver technology studied in this thesis will also help establishing the basis for space-based quantum communication links using satellites, enabling the creation of global quantum networks in a not too far future.
In the realm of long-distance quantum communication, asynchronous measurement-device-independent quantum key distribution (AMDI-QKD) stands out for its experimental simplicity and high key rate generation. Despite these advantages, there exists a challenge in finding a balance between simplifying the laser system further and achieving high key rates. To address this challenge, we have devised a postmeasurement compensation scheme to accurately estimate the mutual frequency offset between two compact lasers using just the announced quantum-signal detection results, thereby obviating the need for optical reference light. As a result, we demonstrate an AMDI-QKD system operating at 2.5 GHz and achieving secure key rates (SKRs) of 537 and 101 kbit / s at distances of 100 and 201 km, respectively, showcasing a significant key rate improvement compared to similar setups. By leveraging ultrastable lasers, we achieve the highest SKRs with measurement-device-independent security within the 100–400-km range. Over 100 km, we reach a remarkable key rate of 1.03 Mbit / s , which could enable real-time one-time-pad video encryption. These findings render AMDI-QKD as a promising contender for the establishment of high performance and cost-effective large-scale intercity quantum networks.