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Generation and tomography of arbitrary optical qubits using transient collective atomic excitations

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Abstract

We demonstrate the preparation of heralded Fock-basis qubits (a|0+b|1) from transient collective spin excitations in a hot atomic vapor. The preparation event is heralded by Raman-scattered photons in a four-wave mixing process seeded by a weak coherent optical excitation. The amplitude and phase of the seed field allow arbitrary control over the qubit coefficients. The qubit state is characterized using balanced homodyne tomography.

© 2014 Optical Society of America

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