Qinetiq Limited

The Secretary of State for Defence in Her Britannic Majesty's Government

Paul Richard Tapster

Terence John Shepherd

Philip Michael Gorman

John G Rarity

Stephen Christopher Kitson

Andrew Charles Lewin

David Arthur Orchard

Rebecca Anne Wilson

Ewan David Finlayson

Martin James Cooper

David Maurice Taylor

David Mark Benton

Richard M Amos

Jonathan Alexander Skoyles Pritchard

Charlotte Rachel Helen Bennett

Apparatus () is provided which is arranged to accept an input data stream. In some embodiments, the apparatus () comprises a sampler arranged to sample the input data stream to provide k samples thereof, wherein each of the samples is n bits long and a string selector arranged to select m binary strings n bits long from at least a chosen subset of all random binary strings of a predetermined length. The apparatus () may further comprise a logical operator arranged to perform a logical function for each of the k samples with each of the selected binary strings to provide a vector, a memory arranged to store a matrix of the vectors generated from k samples, and an address generator arranged to generate RAM address segments from the matrix. In embodiments, the apparatus () may comprise a processor for, for example, pattern matching; feature detection, image recognition.

Photonic processor with pattern matching and image recognition

Random number generation apparatus () is described that comprises a threshold detector () and an electrical noise generator (). The electrical noise generator () has at least two channels (-) and each channel is arranged to generate an electrical noise signal. The threshold detector (), which may comprise a digital input-output (DIO) card, is arranged to periodically compare this electrical noise signal with a threshold and to provide a binary data output that indicates whether the threshold has been exceeded. Each channel of the electrical noise generator comprises at least two amplifiers (-) electrically connected in series that preferably provide a gain of 50,000 or more. Use of the random number generation apparatus () for quantum cryptography applications is also described.

Apparatus and method for generating random numbers

A non-linear optical device includes a frequency-conversion waveguide and first and second input waveguides. The longitudinal axes of the input waveguides are inclined to that of the frequency-conversion waveguide such a first transverse mode is excited in the latter at the input frequency in operation of the device. The frequency-conversion waveguide supports a second transverse mode at an output frequency of the device, such that the phase velocity of the second transverse mode at the output frequency is substantially equal to that of the first transverse mode at the input frequency, thus providing phase-matching by balancing the effects of chromatic and modal dispersion.

Non-linear optical device

A timing and synchronization apparatus and method for a quantum cryptography system is disclosed. A gating pulse is generated by a clock and synchronized to the receipt of transmitted photons at the detector. The apparatus is arranged to only accept photon detection events occurring during the gating period.

Quantum cryptography apparatus

A novel method of fabrication of periodic dielectric composites involving a flexible computer design stage, rapid growth of a second dielectric component. Laser stereolithography is used to form the polymer material layer by layer by photopolymerisation of a liquid. Certain materials constructed in this fashion exhibit a complete loss-free barrier to microwave propagation through the material for a desired band of frequencies and are commonly known as photonic band gap crystals. Such materials could provide a novel medium for all-angle wide- and narrow-band blocking filters, narrow-band transmission filters, reflective and loss-free substrates for planar antennas, and novel loss-free media for oscillator cavities and waveguides. In addition a novel crystal structure, particularly suited to the fabrication method mentioned above and consisting of concatenated polyhedrons, is revealed.

Dielectric media

A method of growing robust large area colloidal photonic crystals and devices produced thereby. A suspension of monosized colloidal spheres ( ) is subjected to a composite shear ( ) by applying a sequential set of shearing forces. The crystalline layers within the colloid experience shearing forces with components in both x and y directions, forcing the colloid into a singe face-centered-cubic structure in preference to a twinned face-centered-cubic structure. The method may also comprise the use of a dispersion medium which is capable of undergoing a controllable phase change from a liquid phase to a solid phase. The crystal may be fixed into a single face-centered cubic structure.

Colloidal photonic crystals

A method of fabricating a dielectric medium comprising two materials with discrete interfaces between the two materials and media formed from the dielectric medium.

Growing community of inventors

Malvern, United Kingdom

Paul Richard Tapster