Brannan T, Qin Z, MacRae A, Lvovsky A I
Opt Lett. 2014 Sep 15;39(18):5447-50. doi: 10.1364/OL.39.005447.
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.
我们展示了如何从热原子蒸汽中的瞬态集体自旋激发制备有 herald 信号的福克基量子比特（a|0〉+b|1〉）。制备事件由弱相干光激发种子的四波混频过程中的拉曼散射光子进行 herald 信号标记。种子场的幅度和相位允许对量子比特系数进行任意控制。使用平衡零差层析成像对量子比特状态进行表征。
