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Frontiers in Optics

Controlling Decoherence in Rydberg Quantum Bits

Russell S. Minns, Mary R. Kutteruf, Hussain Zaidi, Lung Ko, R. R. Jones

Published Jan 1, 2005• 0 citations
Publisher

Abstract

Pulsed electric fields and the entanglement of electron spin and orbital angular momentum are exploited to create arbitrary qbits in Li Rydberg atoms. Periodic application of a quantum NOT operation preserves these qbits against decoherence.
DOI
10.1364/ls.2005.ltub3

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We propose a method of producing high-purity angular-momentum-state Rydberg atoms by a pair of unipolar laser pulses. The first positive-polarity optical half-cycle pulse is used to prepare an excited-state wave packet while the second one is less intense, but with opposite polarity and time delayed, and is employed to drag back the escaping free electron and clip the shape of the bound Rydberg wave packet, selectively increasing or decreasing a fraction of the angular-momentum components. An intelligent choice of laser parameters such as phase and amplitude helps us to control the orbital-angular-momentum composition of an electron wave packet with more facility; thus, a specified angular-momentum state with high purity can be achieved. This scheme of producing high-purity angular-momentum-state Rydberg atoms has significant application in quantum-information processing.