arXiv:quant-ph/9712012 · Physical Review Letters

Quantum Gates with “Hot” Trapped Ions

J. F. Poyatos, J. I. Cirac, P. Zoller

Published Aug 10, 1998• 110 citations

Abstract

We propose a scheme to perform a fundamental two-qubit gate between two trapped ions using ideas from atom interferometry. As opposed to the scheme considered by J. I. Cirac and P. Zoller, [Phys. Rev. Lett. 74, 4091 (1995)], it does not require laser cooling to the motional ground state.

DOI: 10.1103/physrevlett.81.1322

Related papers

Schemes of Quantum Computations with Trapped Ions

J. F. Poyatos, J. I. Cirac, P. Zoller

The purpose of this article is to review two complementary schemes for quantum computation with trapped ions. We initially discuss the first proposal of quantum computations with cold trapped ions (J. I. Cirac and P. Zoller; Phys. Rev. Lett. 74, 4091, 1995) which requires, prior to any computation, laser cooling to the motional ground state. This proposal is closely related to the physics of generating and manipulating N-particles entangled states in both ion traps and high-Q cavities (cavity quantum electrodynamics). The second scheme is that of quantum computations with hot trapped ions (J.F. Poyatos, J.I. Cirac and P. Zoller; Phys. Rev. Lett. 81, 1322, 1998) which works at finite temperature and resembles physical ideas found in atom interferometry.

Fortschritte der PhysikSep 1, 20006 citations

Simplified quantum logic with trapped ions

Christopher R. Monroe, Dietrich G. Leibfried, B. E. King +3 more

We describe a simplified scheme for quantum logic with a collection of laser-cooled trapped atomic ions. Building on the scheme of Cirac and Zoller, we show how the fundamental controlled-NOT gate between a collective mode of ion motion and the internal states of a single ion can be reduced to a single laser pulse, and the need for a third auxiliary internal electronic state can be eliminated.

arXiv:quant-ph/9612042Physical Review AApr 1, 1997116 citations

Method of quantum computation with ``hot'' trapped ions

Sara Schneider, Daniel F. V. James, Gerard J Milburn

We present a novel method of performing quantum logic gates in trapped ion quantum computers which does not require the ions to be cooled down to their vibrational center of mass (CM) mode ground state. Our scheme employs adiabatic passages and the conditional phase shift first investigated by D'Helon and Milburn (C.~D'Helon and G.J.~Milburn, Phys. Rev. A {\bf 54}, 5141 (1996)).

arXiv:quant-ph/9808012Aug 7, 199810 citations

Quantum controlled-NOT gate with 'hot' trapped ions

Sara Schneider, Daniel F. V. James, Gerard J Milburn

We present a novel method of performing quantum logic gates in trapped ion quantum computers which does not require the ions to be cooled down to the ground state of their vibrational modes, thereby avoiding one of the principal experimental difficulties encountered in realizing this technology. Our scheme employs adiabatic passages and a phase shift conditional on the phonon number state.

Journal of Modern OpticsFeb 1, 200011 citations

Experimental Primer on the Trapped Ion Quantum Computer

D. J. Wineland, Christopher R. Monroe, W. M. Itano +5 more

The development of a quantum computer based on a system of trapped atomic ions is described, following the proposal of Cirac and Zoller. Initial results on a two-bit quantum logic gate are presented, and select experimental issues in scaling the system to larger numbers of ions and gates are treated.

Fortschritte der PhysikJun 1, 199874 citations

Quantum State Manipulation Of Trapped Atomic Ions

David J. Wineland, Christopher R. Monroe, D. M. Meekhof +7 more

: A single laser-cooled and trapped Be ion is used to investigate methods of coherent 9 + quantum-state synthesis and quantum logic. We create and characterize nonclassical states of motion including "Schrödinger-cat" states. A fundamental quantum logic gate is realized which uses two states of the quantized ion motion and two ion internal states as qubits. We explore some of the applications for, and problems in realizing, quantum computation based on multiple trapped ions. V w V o 2 cos(6 T t) 1 # x 2 # y 2 R 2 , 2 (1) 1. INTRODUCTION Currently, a major theme in atomic, molecular, and optical physics is coherent control of quantum states. This theme is manifested in a number of topics such as atom interferometry, Bose-Einstein condensation and the atom laser, cavity QED, quantum computation, quantumstate engineering, wavepacket dynamics, and coherent control of chemical reactions. Here, we report related trapped-ion research at NIST which is devoted primarily to a...

Jan 1, 199627 citations