QCEC

Quantum control and error correction with discrete and continuous variables

Coordinatore	UNIVERSITE LIBRE DE BRUXELLES    more  Organization address address: Avenue Franklin Roosevelt 50 city: BRUXELLES postcode: 1050 contact info Titolo: Dr. Nome: Christine Cognome: Courillon Email: send email Telefono: +32 2 26506718 Fax: 3226502321
Nazionalità Coordinatore	Belgium [BE]
Totale costo	164˙300 €
EC contributo	164˙300 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2010-IEF
Funding Scheme	MC-IEF
Anno di inizio	2012
Periodo (anno-mese-giorno)	2012-01-01   -   2013-12-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	UNIVERSITE LIBRE DE BRUXELLES  Organization address address: Avenue Franklin Roosevelt 50 city: BRUXELLES postcode: 1050 contact info Titolo: Dr. Nome: Christine Cognome: Courillon Email: send email Telefono: +32 2 26506718 Fax: 3226502321	BE (BRUXELLES)	coordinator	164˙300.00

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 Obiettivo del progetto (Objective)

'The goal of the project is to develop novel methods for quantum control and error correction with discrete and continuous quantum variables. The scope of investigation includes quantum feedback control, quantum control through dissipation, approximate quantum error correction, and fault-tolerant quantum computation. Some of the topics aim at developing novel tools for both discrete and continuous quantum variables while others are targeted specifically at the continuous-variable case. The project will allow the applicant to extend his expertise in quantum information and control to continuous-variable systems through developing advanced conceptual and methodological tools at the forefront of the field.

The project contains four main work packages (WPs). WP1 aims at developing a theory of quantum feedback control for the task of implementing a given (generally stochastic) quantum operation. It is based on the idea of reducing any protocol to an effective Markovian stochastic process over the ball of normalized superoperators. WP2 aims at developing a framework for analyzing quantum control via dissipation in continuous-variable systems by characterizing the stable solutions of Markovian dynamics in infinite dimensions. It will also develop methods for remodelling the asymptotic solutions of a Markovian process by adding a suitably engineered Markovian term to it. The goal of WP3 is to develop a theory of approximate quantum error correction for continuous quantum variables. The theory will be used to answer important open problems about error correction with Gaussianity constraints. WP4 will investigate the possibility for continuous-variable fault-tolerant quantum computation. One of its goals is to develop techniques to overcome diffusive noise. The thresholds for different types of continuous-variable errors or the intolerance against insurmountable errors will be quantified. Possible experimental applications of the different work packages will also be studied.'

Introduzione (Teaser)

EU-funded research has produced novel formulations of causal relationships at the quantum scale. The theoretical tools will make a major contribution to both fundamental understanding of quantum physics and to development of quantum devices.

Descrizione progetto (Article)

Quantum systems are being developed for numerous applications including high-precision measurement and control, computation and light generation. EU-funded scientists set out to develop novel methods compatible with the quantum world through work on the project 'Quantum control and error correction with discrete and continuous variables' (QCEC).

QCEC has contributed results with important implications for the foundations of quantum theory, quantum information processing and the fundamental problem of unifying quantum theory with general relativity. A major line of inquiry investigated causal order, one of the most fundamental concepts of our Universe and of time - in essence the requirement that an effect comes after its cause.

Scientists reported in Nature Communications that, using a new framework they developed, quantum correlations with no causal order can occur. They also showed that in a classical limit causal order always arises, suggesting that space-time can emerge from a more fundamental structure. Building on this, an important study produced an operational formulation of quantum theory without any predefined time or causal structure. The framework can also describe exotic causal relations such as those expected to exist in the context of quantum gravity.

An important difference in quantum control versus classical control is that the measurement itself changes the dynamics of the system and introduces noise and non-linear components. Scientists made major advances in quantum feedback control and error correction providing new tools for the manipulation of quantum information and its protection against noise.

The development of quantum devices for a variety of applications in basic research and industry has become the focus of more and more research. QCEC results regarding causal order, feedback control and error correction in quantum systems could not be more important relevant with exciting new discoveries and developments expected in the near future.