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Elementary building blocks of quantum information

Overview

Nonclassical light sources, which emit individual photons in a pre-defined quantum state (as opposed to lasers which emit many photons in a collective coherent state), play a basic role in quantum information processing. Efficient quantum communication protocols, as well as many metrology applications, are based on single-photon or twin-photon sources.

Natural atoms and artificial atoms, such as nitrogen-vacancy centres in diamond, or point defects in semiconductor crystals in general, are fundamental building blocks of quantum information processing: they can represent  quantum information. As they interact with photons, they also form an interface to the most fundamental implementation of quantum information carriers. Our aim is to use the variety of quantum resonances of atoms for nonlinear optical interactions, in order to coherently transfer quantum information between optical and microwave photons.

One of the main obstacles of widespread application of quantum communication is the lack of quantum memory devices which can be coupled to communication channels. Such devices should accept information from “flying quantum bits” (quantum bits travelling in communication channels), store it, and reconvert it into flying quantum bits on demand. Furthermore, quantum memory devices with the capability to manipulate quantum information are key components of distributed quantum computing. The experimental know-how gained in the process of developing prototype quantum information devices also contributes to the development of devices based on new principles to increase the efficiency of processing classical information.

Projects

Atom-photon interface
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Dissipative quantum-computation modeling 
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Implementing and manipulating telecom-wavelength-compatible quantum storage
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Mathematical analysis of quantum information storage and processing
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Optical laboratory for quantum information at ELTE
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Quantum-domain intelligent memory networks
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Semiconductor-superconductor hybrid qubits
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Single-photon emitters for visible and telecom wavelengths
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Spin-photon interface
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Topological spin structures in magnetic data storage
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Publications

2021-05-13
EPJ Quantum Technology 8:11

Optimal collection of radiation emitted by a trapped atomic ensemble

Kurkó Árpád
Peter Domokos
András Vukics
Thomas Bækkegaard
Nikolaj Thomas Zinner
Fortágh József
David Petrosyan
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2021-05-06
Nature Materials (2021)

Single-spin resonance in a van der Waals embedded paramagnetic defect

Nathan Chejanovsky
Amlan Mukherjee
Jianpei Geng
Yu-Chen Chen
Youngwook Kim
Andrej Denisenko
Amit Finkler
Takashi Taniguchi
Kenji Watanabe
Durga Bhaktavatsala Rao Dasari
Philipp Auburger
Ádám Gali
Jürgen H. Smet
Jörg Wrachtrup
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2021-04-26
Nature Reviews Materials

Quantum guidelines for solid-state spin defects

Gary Wolfowicz
F. Joseph Heremans
Christopher P. Anderson
Shun Kanai
Hosung Seo
Ádám Gali
Giulia Galli
David D. Awschalom
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Research fields

  • Realization of a quantum communication network
  • Elementary building blocks of quantum information
  • Quantum computation and simulating quantum systems

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