Um Mark, Zhang Junhua, Lv Dingshun, Lu Yao, An Shuoming, Zhang Jing-Ning, Nha Hyunchul, Kim M S, Kim Kihwan
Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, P. R. China.
Korea Institute for Advanced Study, Seoul 130-722, Korea.
Nat Commun. 2016 Apr 21;7:11410. doi: 10.1038/ncomms11410.
Single-quantum level operations are important tools to manipulate a quantum state. Annihilation or creation of single particles translates a quantum state to another by adding or subtracting a particle, depending on how many are already in the given state. The operations are probabilistic and the success rate has yet been low in their experimental realization. Here we experimentally demonstrate (near) deterministic addition and subtraction of a bosonic particle, in particular a phonon of ionic motion in a harmonic potential. We realize the operations by coupling phonons to an auxiliary two-level system and applying transitionless adiabatic passage. We show handy repetition of the operations on various initial states and demonstrate by the reconstruction of the density matrices that the operations preserve coherences. We observe the transformation of a classical state to a highly non-classical one and a Gaussian state to a non-Gaussian one by applying a sequence of operations deterministically.
单量子能级操作是操纵量子态的重要工具。单个粒子的湮灭或产生通过添加或减去一个粒子将量子态转换为另一个量子态，这取决于给定状态下已经存在的粒子数量。这些操作是概率性的，并且在其实验实现中成功率一直较低。在此，我们通过实验证明了（近乎）确定性地添加和减去一个玻色子粒子，特别是在简谐势中离子运动的一个声子。我们通过将声子耦合到一个辅助二能级系统并应用无跃迁绝热通道来实现这些操作。我们展示了在各种初始状态下操作的便捷重复，并通过密度矩阵的重构证明这些操作保持了相干性。通过确定性地应用一系列操作，我们观察到经典态向高度非经典态的转变以及高斯态向非高斯态的转变。
