Continuous-variable controlled-Z gate using an atomic ensemble
arXiv:1103.3119 · doi:10.1103/PhysRevA.83.062339
Abstract
The continuous-variable controlled-Z gate is a canonical two-mode gate for universal continuous-variable quantum computation. It is considered as one of the most fundamental continuous-variable quantum gates. Here we present a scheme for realizing continuous-variable controlled-Z gate between two optical beams using an atomic ensemble. The gate is performed by simply sending the two beams propagating in two orthogonal directions twice through a spin-squeezed atomic medium. Its fidelity can run up to one if the input atomic state is infinitely squeezed. Considering the noise effects due to atomic decoherence and light losses, we show that the observed fidelities of the scheme are still quite high within presently available techniques.
7 pages, 3 figures, to appear in Physical Review A
References in corpus (9)
- Quantum teleportation between light and matter
- Universal Quantum Computation with Continuous-Variable Cluster States
- Experimental demonstration of quantum memory for light
- Quantum Computing with Continuous-Variable Clusters
- Building Gaussian Cluster States by Linear Optics
- Demonstration of a quantum nondemolition sum gate
- Arbitrarily Large Continuous-Variable Cluster States from a Single Quantum Nondemolition Gate
- Demonstration of a universal one-way quantum quadratic phase gate
- High fidelity teleportation between light and atoms