Quantum Computing with an 'Always On' Heisenberg Interaction

Details Quantum Computing with an 'Always On' Heisenberg Interaction Quantum Computing with an 'Always On' Heisenberg Interaction

2002-10-23

arxiv.org/abs/quant-ph/0210157v2

Physics

Quantum Physics

4 pages, 3 figs, 2 column format. To appear in PRL

Scientific paper

10.1103/PhysRevLett.90.247901

Many promising ideas for quantum computing demand the experimental ability to directly switch 'on' and 'off' a physical coupling between the component qubits. This is typically the key difficulty in implementation, and precludes quantum computation in generic solid state systems, where interactions between the constituents are 'always on'. Here we show that quantum computation is possible in strongly coupled (Heisenberg) systems even when the interaction cannot be controlled. The modest ability of 'tuning' the transition energies of individual qubits proves to be sufficient, with a suitable encoding of the logical qubits, to generate universal quantum gates. Furthermore, by tuning the qubits collectively we provide a scheme with exceptional experimental simplicity: computations are controlled via a single 'switch' of only six settings. Our schemes are applicable to a wide range of physical implementations, from excitons and spins in quantum dots through to bulk magnets.

Affiliated with

Also associated with

No associations

Rating

Quantum Computing with an 'Always On' Heisenberg Interaction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quantum Computing with an 'Always On' Heisenberg Interaction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum Computing with an 'Always On' Heisenberg Interaction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-640237