Quantum computing with incoherent resources and quantum jumps

TL;DR

This paper demonstrates that natural processes like spontaneous emission and photon scattering, when properly detected, can be harnessed to perform quantum computation and generate essential quantum states, turning decoherence into a resource.

Contribution

It introduces a method to use incoherent resources and quantum jumps for quantum computing, enabling state teleportation and graph state preparation.

Findings

Quantum teleportation achieved using incoherent photon detection.

Efficient preparation of graph states for measurement-based quantum computing.

Natural dissipative processes can be harnessed for quantum information processing.

Abstract

Spontaneous emission and the inelastic scattering of photons are two natural processes usually associated with decoherence and the reduction in the capacity to process quantum information. Here we show that when suitably detected, these photons are sufficient to build all the fundamental blocks needed to perform quantum computation in the emitting qubits while protecting them from deleterious dissipative effects. We exemplify by showing how to teleport an unknown quantum state and how to efficiently prepare graph states for the implementation of measurement-based quantum computation.