Information free quantum bus for generating stabiliser states

Abstract

Efficient generation of spatially delocalised entangled states is at the heart of quantum information science. Generally flying qubits are proposed for long range entangling interactions, however here we introduce a bus-mediated alternative for this task. Our scheme permits efficient and flexible generation of deterministic two-qubit operator measurements and has links to the important concepts of mode-entanglement and repeat-until-success protocols. Importantly, unlike flying qubit protocols, our bus particle never contains information about the individual quantum states of the particles, hence is information-free.

7 pages, 3 figures: substantial changes, accepted in quant. inf. proc. Added details for physical bus scheme using coherent electronic transport (MRAP)