Toshiba Cambridge Research Laboratory
Cambridge Research Laboratory > Quantum Information

Quantum Information

Toshiba is developing a new approach to information technology that applies the fundamental laws of Quantum Physics to network communications and computing.

Quantum Information Technology concerns the transport and processing of information using individual particles such as electrons or photons. Using single particles in this way brings unexpected advantages. By sending information encoded upon single photons (the particles of light) it is possible to test the secrecy of each communication.

Toshiba has exploited this phenomenon to create a practical system for secure communication over fibre optical cables. However, Quantum Cryptography, as this secure communication method is known, is just the first in a series of quantum innovations that promise to revolutionise the entire IT industry over the next two decades.

Toshiba are at the forefront of quantum information R&D and have developed the world's leading system for quantum cryptography. We welcome enquiries from potential users of this system or from companies or organisations interested in a commercial partnership to further develop the technology and its applications.

Toshiba Research Europe Limited (TREL) is part of Toshiba’s global R&D activity. The Cambridge Research Laboratory of TREL conducts research on quantum information technology, as well as speech recognition and dialogue, and computer vision.

The Quantum Information Group (QIG), led by Dr Andrew Shields, is actively researching the application of Quantum Physics to Information Technologies. Our interest lies not only in exploring new concepts, but also in their practical realization.

Recently we have developed the leading system for Quantum Cryptography, a very secure form of optical communications. In parallel we create the advanced nanotechnology required in future quantum information systems.

Recent Publications

2017 2016 2015
2017
Electrically driven and electrically tunable quantum light sources
J. P. Lee, E. Murray, A. J. Bennett, D. J. P. Ellis, C. Dangel, I. Farrer, P. Spencer, D. A. Ritchie and A. J. Shields
Appl. Phys. Lett., vol 110, no 7, 071102, 13 February 2017 arXiv
Weak localization and weak antilocalization in doped germanium epilayers
P. J. Newton, R. Mansell, S. N. Holmes, M. Myronov and C. H. W. Barnes
Appl. Phys. Lett., vol 110, no 6, 062101 (5 pages), 7 February 2017
Industrial Standards for Quantum Cryptography
A. J. Shields
The Standard, pp. 10-11, February 2017 free
Structural and magnetic properties of ultra-thin Fe films on metal-organic chemical vapour deposited GaN(0001)
J.-Y. Kim, A. Ionescu, R. Mansell, I. Farrer, F. Oehler, C. J. Kinane, J. F. K. Cooper, N.-J. Steinke, S. Langridge, R. Stankiewicz, C. J. Humphreys, R. P. Cowburn, S. N. Holmes and C. H. W. Barnes
J. Appl. Phys., vol 121, no 4, 043904 (7 pages), 24 January 2017
Long-distance quantum key distribution secure against coherent attacks
B. Fröhlich, M. Lucamarini, J. F. Dynes, L. C. Comandar, W. W.-S. Tam, A. Plews, A. W. Sharpe, Z. L. Yuan and A. J. Shields
Optica, vol 4, no 1, 19 January 2017 arXiv free
2017 2016 2015
2016
Practical challenges in quantum key distribution
E. Diamanti, H.-K. Lo, B. Qi and Z. L. Yuan
npj Quantum Information, vol 2, pg 16025, 8 November 2016 free
Resonance fluorescence from a telecom-wavelength quantum dot
R. Al-Khuzheyri, A. C. Dada, J. Huwer, T. S. Santana, J. SkibaSzymanska, M. Felle, M. B. Ward, R. M. Stevenson, I. Farrer, M. G. Tanner, R. H. Hadfield, D. A. Ritchie, A. J. Shields and B. D. Gerardot
Appl. Phys. Lett., vol 109, no 16, 163104 (4 pages), 20 October 2016 arXiv
Enhanced indistinguishability of in-plane single photons by resonance fluorescence on an integrated quantum dot
S. Kalliakos, Y. Brody, A. J. Bennett, D. J. P. Ellis, J. SkibaSzymanska, I. Farrer, J. P. Griffiths, D. A. Ritchie and A. J. Shields
Appl. Phys. Lett., vol 109, no 15, 151112 (5 pages), 13 October 2016
Ultra-high bandwidth quantum secured data transmission
J. F. Dynes, W. W.-S. Tam, A. Plews, B. Fröhlich, A. W. Sharpe, M. Lucamarini, Z. L. Yuan, C. Radig, A. Straw, T. Edwards and A. J. Shields
Sci. Rep., vol 6, 35149 (6 pages), 13 October 2016 arXiv free
Radiative recombination mechanisms in polar and non-polar InGaN/GaN quantum well LED structures
T. J. Badcock, M. Ali, T. Zhu, M. Pristovsek, R. A. Oliver and A. J. Shields
Appl. Phys. Lett., vol 109, no 15, 151110 (5 pages), 12 October 2016
Directly Phase-Modulated Light Source
Z. L. Yuan, B. Fröhlich, M. Lucamarini, G. L. Roberts, J. F. Dynes and A. J. Shields
Phys. Rev. X, vol 6, no 3, 031044 (8 pages), 20 September 2016 arXiv free
A modulator-free QKD transmitter
Z. L. Yuan, B. Fröhlich, M. Lucamarini, G. L. Roberts, J. F. Dynes and A. J. Shields
6th International Conference on Quantum Cryptography (QCrpyt 2016) (2 pages), 12 September 2016 free
Structural, electronic, and magnetic investigation of magnetic ordering in MBE-grown CrxSb2−xTe3 thin films
L. J. Collins-McIntyre, L. B. Duffy, A. Singh, N.-J. Steinke, C. J. Kinane, T. R. Charlton, A. Pushp, A. J. Kellock, S. S. P. Parkin, S. N. Holmes, C. H. W. Barnes, G. van der Laan, S. Langridge and T. Hesjedal
EPL (Europhysics Letters), vol 115, no 2, 22 August 2016 free
Near perfect mode overlap between independently seeded, gain-switched lasers
L. C. Comandar, M. Lucamarini, B. Fröhlich, J. F. Dynes, Z. L. Yuan and A. J. Shields
Opt. Express, vol 24, no 16, pp. 17849-17859, 27 July 2016 arXiv free
Spin-Dependent Transport in Fe/GaAs(100)/Fe Vertical Spin-Valves
P. K. Johnny Wong, W. Zhang, J. Wu, I. G. Will, Y. Xu, Ke Xia, S. N. Holmes, I. Farrer, H. E. Beere and D. A. Ritchie
Sci. Rep., vol 6, 29845 (7 pages), 19 July 2016 free
A semiconductor photon-sorter
A. J. Bennett, J. P. Lee, D. J. P. Ellis, I. Farrer, D. A. Ritchie and A. J. Shields
Nature Nanotech., vol 11, no 10, pp. 857-860, 18 July 2016 arXiv
Decoy-state quantum key distribution with a leaky source
K. Tamaki, M. Curty and M. Lucamarini
New J. Phys., vol 18, no 6, 065008 (24 pages), 20 June 2016 free
Ramsey interference in the resonance fluorescence of a charged quantum dot
J. P. Lee, A. Bennett, J. Skiba-Szymanska, D. Ellis, I. Farrer, D. Ritchie and A. Shields
OSA Technical Digest, JTh2A.30 5 June 2016 ISBN: 978-1-943580-11-8
Conference on Laser and Electro-Optics (CLEO 2016)
Cavity-enhanced coherent light scattering from a quantum dot
A. J. Bennett, J. P. Lee, D. J. P. Ellis, T. Meany, E. Murray, F. F. Floether, J. P. Griffths, I. Farrer, D. A. Ritchie and A. J. Shields
Sci. Adv., vol 2, no 4, e1501256 (4 pages), 22 April 2016 arXiv free
Quantum key distribution over multicore fiber
J. F. Dynes, S. J. Kindness, S. W.-B. Tam, A. Plews, A. W. Sharpe, M. Lucamarini, B. Fröhlich, Z. L. Yuan, R. V. Penty and A. J. Shields
Opt. Express, vol 24, no 8, pp. 8081-8087, 6 April 2016 arXiv free
Quantum key distribution without detector vulnerabilities using optically seeded lasers
L. C. Comandar, M. Lucamarini, B. Fröhlich, J. F. Dynes, A. W. Sharpe, S. W.-B. Tam, Z. L. Yuan, R. V. Penty and A. J. Shields
Nature Photonics, vol 10, no 5, pp. 312-315, 4 April 2016 arXiv
InGaAs spin light emitting diodes measured in the Faraday and oblique Hanle geometries
R. Mansell, J.-B. Laloë, S. N. Holmes, A. Petrou, I. Farrer, G. A. C. Jones, D. A. Ritchie and C. H. W. Barnes
J. Phys. D: Appl. Phys., vol 49, no 16, 165103 (5 pages), 24 March 2016 free
An entangled-LED-driven quantum relay over 1km
C. Varnava, R. Mark Stevenson, J. Nilsson, J. Skiba-Szymanska, B. Dzurnák, M. Lucamarini, R. V. Penty, I. Farrer, D. A. Ritchie and A. J. Shields
npj Quantum Information, vol 2, 16006 (7 pages), 15 March 2016 arXiv free
Few-second-long correlation times in a quantum dot nuclear spin bath probed by frequency-comb nuclear magnetic resonance spectroscopy
A. M. Waeber, M. Hopkinson, I. Farrer, D. A. Ritchie, J. Nilsson, R. M. Stevenson, A. J. Bennett, A. J. Shields, G. Burkard, A. I. Tartakovskii, M. S. Skolnick and E. A. Chekhovich
Nature Phys., vol 12, no 7, pp. 688-693, 14 March 2016 arXiv
Ramsey interference in a multilevel quantum system
J. P. Lee, A. J. Bennett, J. Skiba-Szymanska, D. J. P. Ellis, I. Farrer, D. A. Ritchie and A. J. Shields
Phys. Rev. B, vol 93, no 8, 085407 (8 pages), 4 February 2016 arXiv
2017 2016 2015
2015
Self-assembled Multilayers of Silica Nanospheres for Defect Reduction in Non- and Semipolar Gallium Nitride Epitaxial Layers
T. Zhu, T. Ding, F. Tang, Y. Han, M. Ali, T. Badcock, M. J. Kappers, A. J. Shields, S. K. Smoukov and R. A. Oliver
Cryst. Growth Des., vol 16, no 2, pp. 1010-1016, 29 December 2015 free
Quantum key distribution with an entangled light emitting diode
B. Dzurnak, R. M. Stevenson, J. Nilsson, J. F. Dynes, Z. L. Yuan, J. Skiba-Szymanska, I. Farrer, D. A. Ritchie and A. J. Shields
Appl. Phys. Lett., vol 107, no 26, 261101 (4 pages), 28 December 2015
Quantum secured gigabit optical access networks
B. Fröhlich, J. F. Dynes, M. Lucamarini, A. W. Sharpe, S. W.-B. Tam, Z. L. Yuan and A. J. Shields
Sci. Rep., vol 5, 18121 (7 pages), 14 December 2015 arXiv free
Quantum cryptography: Round-robin with photons
B. Fröhlich and Z. L. Yuan
Nature Photonics, vol 9, no 12, pp. 781-782, 27 November 2015
Quantum photonics hybrid integration platform
E. Murray, D. J. P. Ellis, T. Meany, F. F. Floether, J. P. Lee, J. P. Griffiths, G. A. C. Jones, I. Farrer, D. A. Ritchie, A. J. Bennett and A. J. Shields
Appl. Phys. Lett., vol 107, no 17, 171108 (4 pages), 29 October 2015 arXiv
Density dependent composition of InAs quantum dots extracted from grazing incidence x-ray diffraction measurements
M. Sharma, M. K. Sanyal, I. Farrer, D. A. Ritchie, A. B. Dey, A. Bhattacharyya, O. H. Seeck, J. Skiba-Szymanska, M. Felle, A. J. Bennett and A. J. Shields
Sci. Rep., vol 5, 15732 (11 pages), 28 October 2015 free
Quantum Teleportation with Light-emitting-diodes
R. M. Stevenson, C. Varnava, J. Nilsson, J. Skiba-Szymanska, B. Dzurnak, M. Lucamarini, R. V. Penty, I. Farrer, D. A. Ritchie and A. J. Shields
OSA Technical Digest, FTu2A.2 18 October 2015
Frontiers in Optics 2015
Interference with a quantum dot single-photon source and a laser at telecom wavelength
M. Felle, J. Huwer, R. M. Stevenson, J. Skiba-Szymanska, M. B. Ward, I. Farrer, R. V. Penty, D. A. Ritchie and A. J. Shields
Appl. Phys. Lett., vol 107, no 13, 131106 (4 pages), 29 September 2015 arXiv
Practical Security Bounds Against the Trojan-Horse Attack in Quantum Key Distribution
M. Lucamarini, I. Choi, M. B. Ward, J. F. Dynes, Z. L. Yuan and A. J. Shields
Phys. Rev. X, vol 5, no 3, 031030, 9 September 2015 arXiv free
Efficient and robust quantum random number generation by photon number detection
M. J. Applegate, O. Thomas, J. F. Dynes, Z. L. Yuan, D. A. Ritchie and A. J. Shields
Appl. Phys. Lett., vol 107, no 7, 071106 (5 pages), 18 August 2015
Polarization-correlated photons from a positively charged quantum dot
Y. Cao, A. J. Bennett, I. Farrer, D. A. Ritchie and A. J. Shields
Phys. Rev. B, vol 92, no 8, 081302R (4 pages), 7 August 2015 arXiv
Hong-Ou-Mandel Interference with a Quantum Dot Single Photon Source and a Laser at Telecom Wavelength
J. Huwer, M. Felle, R. M. Stevenson, J. SkibaSzymanska, M. B. Ward, I. Farrer, R. V. Penty, D. A. Ritchie and A. J. Shields
Single Photon Workshop 2015 14 July 2015 free
Magnetotransport in p-type Ge quantum well narrow wire arrays
P. J. Newton, J. Llandro, R. Mansell, S. N. Holmes, C. Morrison, J. Foronda, M. Myronov, D. R. Leadley and C. H. W. Barnes
Appl. Phys. Lett., vol 106, no 17, 172102 (4 pages), 28 April 2015
The Scanning TMR Microscope for Biosensor Applications
K. N. Vyas, D. M. Love, A. Ionescu, J. Llandro, P. Kollu, T. Mitrelias, S. Holmes and C. H. W. Barnes
Biosensors, vol 5, no 2, pp. 172-186, 2 April 2015 free
Quantum Secured Gigabit Passive Optical Networks
B. Fröhlich, J. F. Dynes, M. Lucamarini, A. W. Sharpe, S. W. Tam, Z. L. Yuan and A. J. Shields
OSA Technical Digest (online) (Optical Society of America, 2015), W4F.1 (3 pages), 22 March 2015 ISBN: 978-1-55752-937-4
Optical Fiber Communication Conference 2015
High speed prototype quantum key distribution system and long term field trial
A. R. Dixon, J. F. Dynes, M. Lucamarini, B. Fröhlich, A. W. Sharpe, A. Plews, S. Tam, Z. L. Yuan, Y. Tanizawa, H. Sato, S. Kawamura, M. Fujiwara, M. Sasaki and A. J. Shields
Opt. Express, vol 23, no 6, pp. 7583-7592, 16 March 2015 free
On-chip generation and in-plane transmission of indistinguishable photons
S. Kalliakos, Y. Brody, A. Schwagmann, A. J. Bennett, M. B. Ward, D. J. P. Ellis, J. Skiba-Szymanska, I. Farrer, J. P. Griffiths, G. A. C. Jones, D. A. Ritchie and A. J. Shields
Proceedings of SPIE, vol 9357, 935718 (7 pages), 16 March 2015
Edited by B. Witzigmann, M. Osiński, F. Henneberger, Y. Arakawa Physics and Simulation of Optoelectronic Devices XXIII (Photonics West 2015)
Growth variations and scattering mechanisms in metamorphic In0.75Ga0.25As/In0.75 Al0.25As quantum wells grown by molecular beam epitaxy
C. Chen, I. Farrer, S. N. Holmes, F. Sfigakis, M. P. Fletcher, H. E. Beere and D. A. Ritchie
J. Cryst. Growth, vol 425, pp. 70-75 (1 September 2015), 7 March 2015
The 18th International Conference on Molecular Beam Epitaxy (MBE 2014)
Combining fast electrical control and resonant excitation to create a wavelength-tuneable and coherent quantum-dot light source
A. J. Bennett, Y. Cao, D. J. P. Ellis, I. Farrer, D. A. Ritchie and A. J. Shields
Proceedings of SPIE, vol 9373, 937302 (6 pages), 27 February 2015
Edited by D. L. Huffaker and H. Eisele Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XII (Photonics West 2015)
Gigahertz-gated InGaAs/InP single-photon detector with detection efficiency exceeding 55% at 1550nm
L. C. Comandar, B. Fröhlich, J. F. Dynes, A. W. Sharpe, M. Lucamarini, Z. L. Yuan, R. V. Penty and A. J. Shields
J. Appl. Phys., vol 117, no 8, 083109 (5 pages), 26 February 2015 arXiv
Security Bounds for Efficient Decoy-State Quantum Key Distribution
M. Lucamarini, J. F. Dynes, B. Fröhlich, Z. Yuan and A. J. Shields
IEEE J. Selected Topics Quant. Electron., vol 21, no 3, 6601408 (May 2015) (8 pages), 26 January 2015 arXiv
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