Analysis of experimental feasibility of polar-molecule-based phase gates
Abstract
We analyze a recently proposed physical implementation of a quantum computer based on polar molecules with “switchable” dipoles, i.e., dipole moments that can be switched “on” and “off”. Conditional dipole-dipole interaction is an efficient tool for realizing two-qubit quantum gates necessary to construct universal gates. A set of general requirements for a molecular system is presented, which would provide an optimal combination of quantum gate times, coherence times, number of operations, high gate accuracy, and experimental feasibility. We proceed with an analysis of a two-qubit phase gate realization based on switchable dipole-dipole interactions between polar molecules in an optical lattice architecture. We consider one of the schemes proposed in our previous work [Phys. Rev. A 74, 050301(R) (2006)], using specific molecules, such as CO and NF. We suggest suitable electronic states and transitions, and investigate requirements for the laser pulses driving them. Finally, we analyze possible sources of decoherence and list practical difficulties of the scheme.
- Publication:
-
Physical Review A
- Pub Date:
- July 2008
- DOI:
- 10.1103/PhysRevA.78.012313
- Bibcode:
- 2008PhRvA..78a2313K
- Keywords:
-
- 03.67.Lx;
- 03.67.Mn;
- Quantum computation;
- Entanglement production characterization and manipulation