Symmetrised Characterisation of Noisy Quantum Processes

Simple item page
dc.creatorEmerson, Joseph
dc.creatorSilva, Marcus
dc.creatorMoussa, Osama
dc.creatorRyan, Colm
dc.creatorLaforest, Martin
dc.creatorBaugh, Jonathan
dc.creatorCory, David G.
dc.creatorLaflamme, Raymond
dc.date2007-07-04
dc.date.accessioned2026-07-07T08:39:00Z
dc.date.available2026-07-07T08:39:00Z
dc.descriptionA major goal of developing high-precision control of many-body quantum systems is to realise their potential as quantum computers. Probably the most significant obstacle in this direction is the problem of "decoherence": the extreme fragility of quantum systems to environmental noise and other control limitations. The theory of fault-tolerant quantum error correction has shown that quantum computation is possible even in the presence of decoherence provided that the noise affecting the quantum system satisfies certain well-defined theoretical conditions. However, existing methods for noise characterisation have become intractable already for the systems that are controlled in today's labs. In this paper we introduce a technique based on symmetrisation that enables direct experimental characterisation of key properties of the decoherence affecting a multi-body quantum system. Our method reduces the number of experiments required by existing methods from exponential to polynomial in the number of subsystems. We demonstrate the application of this technique to the optimisation of control over nuclear spins in the solid state.
dc.descriptionAbout 12 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0707.0685
dc.identifierhttp://arxiv.org/abs/0707.0685
dc.identifierScience 317, 1893-1896 (2007).
dc.identifierdoi:10.1126/science.1145699
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140932
dc.subjectQuantum Physics
dc.titleSymmetrised Characterisation of Noisy Quantum Processes
dc.typetext

Files

Collections

arXiv