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Measurement of qubits

We describe in detail the theory underpinning the measurement of density matrices of a pair of quantum two-level systems ~‘‘qubits’’ !. Our particular emphasis is on qubits realized by the two… Expand

Quantum dynamics of cold trapped ions with application to quantum computation

- D. James
- Physics
- 27 February 1997

The theory of interactions between lasers and cold trapped ions as it pertains to the design of Cirac-Zoller quantum computers is discussed. The mean positions of the trapped ions, the eigenvalues… Expand

Optically Polarized Atoms: Understanding light-atom interactions

- D. James
- Physics
- 10 September 2010

I: INTRODUCTION TO LIGHT-ATOM INTERACTIONS 1. Introduction 2. Atomic States 3. A bit of angular-momentum theory 4. Atoms in external electric and magnetic fields 5. Polarized atoms 6. Polarized light… Expand

The generalized Fresnel transform and its application to optics

- D. James, G. Agarwal
- Physics
- 15 May 1996

We consider the mathematical properties of a class of linear transforms, which we call the generalized Fresnel transforms, and which have wide applications to several areas of optics. Well-known… Expand

Ion Trap Quantum Computing with Warm Ions

- G. Milburn, S. Schneider, D. James
- Physics
- 1 September 2000

We describe two schemes to manipulate the electronic qubit states of trapped ions independent of the collective vibrational state of the ions. The first scheme uses an adiabatic method, and thus is… Expand

Deterministic quantum teleportation with atoms

- M. Riebe, H. Häffner, +8 authors R. Blatt
- Physics, Medicine
- Nature
- 17 June 2004

TLDR

Quantum process tomography of a controlled-NOT gate.

- J. O'Brien, G. Pryde, +4 authors A. G. White
- Physics, Medicine
- Physical review letters
- 23 February 2004

We demonstrate complete characterization of a two-qubit entangling process--a linear optics controlled-NOT gate operating with coincident detection--by quantum process tomography. We use a… Expand

Effective Hamiltonian theory and its applications in quantum information

This paper presents a useful compact formula for deriving an effective Hamiltonian describing the time-averaged dynamics of detuned quantum systems. The formalism also works for ensemble-averaged… Expand

Maximizing the entanglement of two mixed qubits

- W. Munro, D. James, A. G. White, P. Kwiat
- Physics
- 20 March 2001

Two-qubit states occupy a large and relatively unexplored Hilbert space. Such states can be succinctly characterized by their degree of entanglement and purity. In this article we investigate… Expand

Change of polarization of light beams on propagation in free space

- D. James
- Physics
- 1 May 1994

It is shown by use of a simple model that in general the state of polarization of a light beam generated by a partially coherent source changes as the beam propagates in free space.

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