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We demonstrate the generation of heralded Fock-basis qubits $(a|0\rangle +b|1\rangle)$ from transient collective spin excitations in a hot atomic vapor.The collective spin excitation is heralded by Raman-scattered photons in afour-wave mixing process seeded by a weak coherent optical excitation. Theamplitude and phase of the seed field allow arbitrary control over the qubitcoefficients. The state of the ensemble is read out optically and thencharacterized using balanced homodyne tomography. This work represents a steptowards quantum engineering of collective atomic spin states.

Generation and tomography of arbitrary qubit states in a transient collective atomic excitation