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• W2955009370 abstract "Single photons are excellent quantum information carriers, but current schemes for preparing, processing and measuring them are inefficient. This paper introduces a process termed coherent photon conversion that could provide a new way to generate and process complex multiquanta states for photonic quantum information applications. The new scheme is not restricted to optical systems, and could also function in optomechanical, electromechanical and superconducting systems that exhibit even stronger intrinsic nonlinearities. Single photons are excellent quantum information carriers: they were used in the earliest demonstrations of entanglement1 and in the production of the highest-quality entanglement reported so far2,3. However, current schemes for preparing, processing and measuring them are inefficient. For example, down-conversion provides heralded, but randomly timed, single photons4, and linear optics gates are inherently probabilistic5. Here we introduce a deterministic process—coherent photon conversion (CPC)—that provides a new way to generate and process complex, multiquanta states for photonic quantum information applications. The technique uses classically pumped nonlinearities to induce coherent oscillations between orthogonal states of multiple quantum excitations. One example of CPC, based on a pumped four-wave-mixing interaction, is shown to yield a single, versatile process that provides a full set of photonic quantum processing tools. This set satisfies the DiVincenzo criteria for a scalable quantum computing architecture6, including deterministic multiqubit entanglement gates (based on a novel form of photon–photon interaction), high-quality heralded single- and multiphoton states free from higher-order imperfections, and robust, high-efficiency detection. It can also be used to produce heralded multiphoton entanglement, create optically switchable quantum circuits and implement an improved form of down-conversion with reduced higher-order effects. Such tools are valuable building blocks for many quantum-enabled technologies. Finally, using photonic crystal fibres we experimentally demonstrate quantum correlations arising from a four-colour nonlinear process suitable for CPC and use these measurements to study the feasibility of reaching the deterministic regime with current technology4,7. Our scheme, which is based on interacting bosonic fields, is not restricted to optical systems but could also be implemented in optomechanical, electromechanical and superconducting systems8,9,10,11,12 with extremely strong intrinsic nonlinearities. Furthermore, exploiting higher-order nonlinearities with multiple pump fields yields a mechanism for multiparty mediation of the complex, coherent dynamics." @default.
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• W2955009370 date "2011-01-01" @default.
• W2955009370 modified "2023-09-26" @default.
• W2955009370 title "Efficient quantum computing using coherent photon conversion" @default.
• W2955009370 hasPublicationYear "2011" @default.
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