Modeling of decoherence and fidelity enhancement during transport of entangled qubits

Understand

Entangled qubits transported through space is a key element in many prospective quantum information systems, from long-distance quantum communication to large modular quantum processors.

• The moving qubits are decohered by time- and space-dependent noises with finite extent of correlations.
• Since the qubit paths are interrelated, the phase fluctuations experienced by the qubits exhibit peculiar correlations, which are difficult to analyze with the conventional theory of random processes.
• We propose an approach to this problem based on the concept of trajectories on random sheets.