The field of quantum information and computation (QC) [1] brings together ideas and techniques from very different areas ranging from fundamental quantum physics to solid-state engineering andâ€¦ (More)

Two-qubit logical gates are proposed on the basis of two atoms trapped in a cavity setup and commonly addressed by laser fields. Losses in the interaction by spontaneous transitions are efficientlyâ€¦ (More)

Holonomic Quantum Computation (HQC) is an all-geometrical approach to quantum information processing. In the HQC strategy information is encoded in degenerate eigen-spaces of a parametric family ofâ€¦ (More)

Topological features in quantum computing provide controllability and noise error avoidance in the performance of logical gates. While such resilience is favored in the manipulation of quantumâ€¦ (More)

A geometrical approach to quantum computation is presented, where a non-abelian connection is introduced in order to rewrite the evolution operator of an energy degenerate system as a holonomicâ€¦ (More)

This work presents a first study of a radiative calculation for the gravitational axial anomaly in the massless Abelian Higgs model. The two loop contribution to the anomalous correlation function ofâ€¦ (More)

In this paper the idea of holonomic quantum computation is realized within quantum optics. In a non-linear Kerr medium the degenerate states of laser beams are interpreted as qubits. Displacingâ€¦ (More)

Understanding the behaviour of topologically ordered latt ice systems at finite temperature is a way of assessing their potential as fault-tolerant quantum memories. We compute the natural extensionâ€¦ (More)

In this article we will be concerned with some possible physical realizations of quantum gates that are useful for quantum information processing. After a brief introduction into the subject, in Sec.â€¦ (More)