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Full Name: 
Scalable Quantum computing with Light and Atoms
Prof. Philippe Grangier


Institut d'Optique
48° 50' 51.5364" N, 2° 15' 50.4396" E
Running time: 
2005-11-01 - 2009-10-31

The goal of SCALA is the realisation of a scalable quantum computer, by using individually controlled atoms, ions and photons in order to encode, store, process and transmit qubits.

This long-term goal is divided into two specific objectives, achievable during the project duration:
A) Realisation of interconnected quantum gates and quantum wiring elements, which are required as building blocks of a general purpose quantum computer.
B) Realisation of first approaches of "operational" quantum computing, which include
(i) systems able to perform small-scale quantum algorithms, such as error correction
(ii) special-purpose quantum processors, such as quantum simulators, and
(iii) entanglement-assisted metrology.

In order to achieve these objectives, the IP teams will use all the tools and methods of atomic, molecular and optical physics. Experiments will involve strings of individual ions in Paul or Penning traps, arrays of neutral atoms stored in dipole traps, optical lattices or micro-magnetic traps ("atom chips"), and a great variety of cavity QED techniques. In addition, broader theoretical studies will explore the path towards a scalable general-purpose quantum computer. The objectives A and B are actually associated with two ways for achieving scalability: a "bottom-up" route consisting of developing elementary registers, gates and processors, and then networking them, and a "top-down" route starting with large, strongly interconnected, distributed systems, such as atoms in optical lattices, which are natural candidates for quantum simulators.

Combining both approaches is a guiding principle in SCALA, and would be a major achievement for the future of quantum computers. SCALA will be organized to optimise flows of information between the participating teams. The results will be disseminated by scientific publications, and the spin-offs will be exploited by an industrial partner specialized in metrology, and through connections with many SMEs.

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