Two-qubit conditional quantum-logic operation in a single self-assembled quantum dot

2008/02/29 by S. J. Boyle, A. J. Ramsay, F. Bello +6 · 1 citation
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.78.075301

4- pages, 4 figures, to be submitted to PRL

arxiv created 2008/02/29 · openalex publication_date 2008/08/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The four-level exciton/biexciton system of a single semiconductor quantum dot acts as a two-qubit register. We experimentally demonstrate an exciton-biexciton Rabi rotation conditional on the initial exciton spin in a single InGaAs/GaAs dot. This forms the basis of an optically gated two-qubit controlled rotation (CROT) quantum-logic operation where an arbitrary exciton spin is selected as the target qubit using the polarization of the control laser.

Citations

• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Decoherence processes during optical manipulation of excitonic qubits in semiconductor quantum dots
• Theory of Fast Optical Spin Rotation in a Quantum Dot Based on Geometric Phases and Trapped States

Cited by

• Generation of entanglement in systems of intercoupled qubits