Methods and apparatus for use in quantum key distribution (QKD) are described. A quantum
QKD signal is generated at a source and transmitted through a fiber optic network to an …

The method involves exchange of a quantum signal between a first quantum node and a
second quantum node as is usual in known quantum key distribution (QKD) scheme. The …

The invention relates to methods and apparatus for Quantum key distribution. Such methods
including authenticating a first node in a communications network with a remote node in the …

Methods and apparatus for quantum key distribution are described, in particular including
methods and networks 300 arranged to improve and/or ensure the security of data …

A method of performing quantum key distribution across a network. The method involves a
first node first agreeing a quantum key with a first intermediate node in the path. Next the …

(57) ABSTRACT A method of key distribution from a first entity to a second entity including
the first entity communicating with a move able key device so as to share a secret data with …

An optical circuit comprises: a first waveguide; a second waveguide: and a third waveguide
that converts mode field and direction of polarization of light of said first waveguide at the …

This invention relates to an optical star network in which different communities of users, such
as different businesses, are provided through use of quantum key distribution (QKD). At least …

A photonic light circuit device is described that comprises a semiconductor substrate and
two or more optical components wherein one or more hollow core optical waveguides are …

GO2B 27/16(2006.01) GO2B 27/4(2006.01)(57) ABSTRACT GOI. 3/02(2006.01) A spatial
splitting-based optical Micro Electro-Mechanical GOIF 9/02(2006.01) Systems (MEMS) …