# Complete Methods Set for Scalable Ion Trap Quantum Information Processing

@article{Home2009CompleteMS, title={Complete Methods Set for Scalable Ion Trap Quantum Information Processing}, author={J. P. Home and David Hanneke and John D. Jost and Jason M. Amini and Dietrich Leibfried and David J. Wineland}, journal={Science}, year={2009}, volume={325}, pages={1227 - 1230} }

Hi Fi Quantum Computing In quantum information processing, one goal is to control the entangled states of objects such that they can interact during logical operations but otherwise have minimal interactions with their environment. In one scheme for quantum computing, ions are trapped within and physically moved by electric fields. One drawback is that the entangled states can be sensitive to stray magnetic fields. Home et al. (p. 1227, published online 6 August 2009) show that coupling of the…

## 215 Citations

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## References

SHOWING 1-10 OF 60 REFERENCES

Entanglement of single-atom quantum bits at a distance

- PhysicsNature
- 2007

The entanglement of two fixed single-atom quantum memories separated by one metre is demonstrated by directly measuring qubit correlations with near-perfect detection efficiency, and is still in principle useful for subsequent quantum operations and scalable quantum information applications.

Deterministic quantum teleportation of atomic qubits

- PhysicsNature
- 2004

Un unconditional teleportation of massive particle qubits using atomic (9Be+) ions confined in a segmented ion trap is reported, which achieves an average fidelity of 78 per cent, which exceeds the fidelity of any protocol that does not use entanglement.

Towards fault-tolerant quantum computing with trapped ions

- Physics
- 2008

Like their classical counterparts, quantum computers can, in theory, cope with imperfections—provided that these are small enough. The regime of fault-tolerant quantum computing has now been reached…

Experimental Issues in Coherent Quantum-State Manipulation of Trapped Atomic Ions

- PhysicsJournal of research of the National Institute of Standards and Technology
- 1998

Some experimental issues in the proposal for trappedion quantum computation by J. I. Cirac and P. Zoller (University of Innsbruck) are discussed and several possible decoherence mechanisms are examined.

Architecture for a large-scale ion-trap quantum computer

- Physics, Computer ScienceNature
- 2002

This work shows how to achieve massively parallel gate operation in a large-scale quantum computer, based on techniques already demonstrated for manipulating small quantum registers, and uses the use of decoherence-free subspaces to do so.

Quantum computing with realistically noisy devices

- Computer Science, PhysicsNature
- 2005

This work reports a simple architecture for fault-tolerant quantum computing, providing evidence that accurate quantum computing is possible for EPGs as high as three per cent, and shows that non-trivial quantum computations at EPG’s of as low as one per cent could be implemented.

The Physical Implementation of Quantum Computation

- Physics
- 2000

After a brief introduction to the principles and promise of quantum information processing, the requirements for the physical implementation of quantum computation are discussed. These five…

How to build a 300 bit, 1 Giga-operation quantum computer

- PhysicsQuantum Inf. Comput.
- 2007

The main features of a design for a large quantum computer based on experimental methods for laser control of trapped ions are given, with a view to identifying areas for study.

Sympathetic cooling of trapped Cd + isotopes

- Physics
- 2002

A collection of cold trapped ions offers one of the most promising avenues towards realizing a quantum computer @1‐4 #. Quantum information is stored in the internal states of individual trapped…

Entangled states of trapped atomic ions

- PhysicsNature
- 2008

Experiments show that just a few entangled trapped ions can be used to improve the precision of measurements, and if the entanglement in such systems can be scaled up to larger numbers of ions, simulations that are intractable on a classical computer might become possible.