Patent ID: 9111229
Filing Date: 2015-08-18
Classification: B82Y,G06N,H04L

Abstract:
1. A quantum repeater optically couplable to left and right neighbour nodes through local-link optical channels; the repeater comprising: quantum physical hardware providing left-side and right-side repeater portions (L, R) respectively arranged to support left-side and right-side qubits for entanglement with qubits in the left and right neighbour nodes respectively by light fields transmitted over the local-link channels thereby to form respective local link entanglements, herein “LLE”s; the quantum physical hardware being operable to merge two entanglements respectively involving a left-side and a right-side qubit, by locally operating on these qubits; left and right LLE control units for controlling the quantum physical hardware to effect on-going creation of left and right LLEs in cooperation with the left and right neighbour nodes; and a top-level control arrangement operative to control top-level cyclic operation of the repeater in synchronism with its neighbour nodes, the top-level control arrangement being arranged once every top-level operating cycle to initiate merging of entanglements respectively involving a left-side and a right-side qubit when these qubits are at least expected to be entangled leftwards and rightwards respectively.