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
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
Weak localization and weak antilocalization in doped germanium epilayers
P. J. Newton, R. Mansell, S. N. Holmes, M. Myronov and C. H. W. Barnes
Industrial Standards for Quantum Cryptography
A. J. Shields
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
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
Practical challenges in quantum key distribution
E. Diamanti, H.-K. Lo, B. Qi and Z. L. Yuan
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
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
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
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
Directly Phase-Modulated Light Source
Z. L. Yuan, B. Fröhlich, M. Lucamarini, G. L. Roberts, J. F. Dynes and A. J. Shields
A modulator-free QKD transmitter
Z. L. Yuan, B. Fröhlich, M. Lucamarini, G. L. Roberts, J. F. Dynes and A. J. Shields
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
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
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
A semiconductor photon-sorter
A. J. Bennett, J. P. Lee, D. J. P. Ellis, I. Farrer, D. A. Ritchie and A. J. Shields
Decoy-state quantum key distribution with a leaky source
K. Tamaki, M. Curty and M. Lucamarini
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
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
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
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
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
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
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
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
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
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
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
Quantum cryptography: Round-robin with photons
B. Fröhlich and Z. L. Yuan
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
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
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
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
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
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
Polarization-correlated photons from a positively charged quantum dot
Y. Cao, A. J. Bennett, I. Farrer, D. A. Ritchie and A. J. Shields
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
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
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
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
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
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
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
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
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
Security Bounds for Efficient Decoy-State Quantum Key Distribution
M. Lucamarini, J. F. Dynes, B. Fröhlich, Z. Yuan and A. J. Shields
