Quantum Information

The Quantum Information Group (QIG) is developing a new approach to information technology that applies the fundamental laws of Quantum Physics to network communications and computing.

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Quantum Key Distribution

Quantum Devices

Quantum cryptography provides a secure means for distributing secret keys between two parties (usually referred to as Alice and Bob) on an optical network. A unique feature of the technique is that the secrecy of the keys is independent of the resources available to a hacker.

Applications in quantum information technology, such as quantum cryptography and quantum computing, require new devices that generate and detect light at the quantum level. Toshiba have developed a generic nanotechnology for single photon generation and detection using semiconductor quantum dots.

Latest Publications

Quantum teleportation using highly coherent emission from telecom C-band quantum dots
M. Anderson, T. Müller, J. Huwer, J. Skiba-Szymanska, A. B. Krysa, R. M. Stevenson, J. Heffernan, D. A. Ritchie and A. J. Shields
npj Quantum Information, vol 6, 14 (7 pages), 31 January 2020

Cambridge quantum network
J. F. Dynes, A. Wonfor, W. W.-S. Tam, A. W. Sharpe, R. Takahashi, M. Lucamarini, A. Plews, Z. L. Yuan, A. R. Dixon, J. Cho, Y. Tanizawa, J.-P. Elbers,
H. Greißer, I. H. White, R. V. Penty and A. J. Shields
npj Quantum Information, vol 5, 101 (8 pages), 21 November 2019

Intrinsic Mitigation of the After-Gate Attack in Quantum Key Distribution through Fast-Gated Delayed Detection
A. Koehler-Sidki, J. F. Dynes, A. Martinez, M. Lucamarini, G. L. Roberts, A. W. Sharpe, Z. L. Yuan and A. J. Shields
Phys. Rev. Applied, vol 12, no 2, 024050 (8 pages), 23 August 2019 / arXiv

Simple source device-independent continuous-variable quantum random number generator
P. R. Smith, D. G. Marangon, M. Lucamarini, Z. L. Yuan and A. J. Shields
Phys. Rev. A, vol 99, no 6, 062326 (8 pages), 20 June 2019 / arXiv

Photon Phase Shift at the Few-Photon Level and Optical Switching by a Quantum Dot in a Microcavity
L. M. Wells, S. Kalliakos, B. Villa, D. J. P. Ellis, R. M. Stevenson, A. J. Bennett, I. Farrer, D. A. Ritchie and A. J. Shields
Phys. Rev. Applied, vol 11, no 6, 061001, 6 June 2019 / arXiv

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