利用束缚粒子的量子行走研究NOON态
NOON States via Quantum Walk of Bound Particles
摘要：
紧束缚晶格模型允许创建绑定的复合对象，在强相互作用的制度，是防止解离。我们表明，在晶格势的局部杂质可以产生一个相干分裂的传入绑定粒子波包，从而产生一个NOON状态之间的端点。这是不平凡的，因为当涉及有限格时，边缘局部化效应使它们用于非经典状态生成和信息传输具有挑战性。我们推导出一个有效的模型来描述玻色-哈伯德链中束缚粒子的传播。我们在晶格势中引入局部杂质以抑制局域化效应并分裂传播的束缚粒子，从而能够产生遥远的NOON态。我们分析了最小工程传输方案如何提高传输保真度，并量化了光晶格实现中对典型退相干效应的鲁棒性。我们的方案可能会对量子增强的原子干涉术产生影响。
英文摘要：
Tight-binding lattice models allow the creation of bound composite objects which, in the strong-interacting regime, are protected against dissociation. We show that a local impurity in the lattice potential can generate a coherent split of an incoming bound particle wave-packet which consequently produces a NOON state between the endpoints. This is non trivial because when finite lattices are involved, edge-localisation effects make their use for non-classical state generation and information transfer challenging. We derive an effective model to describe the propagation of bound particles in a Bose-Hubbard chain. We introduce local impurities in the lattice potential to inhibit localisation effects and to split the propagating bound particle, thus enabling the generation of distant NOON states. We analyse how minimal engineering transfer schemes improve the transfer fidelity and we quantify the robustness to typical decoherence effects in optical lattice implementations. Our scheme potentially have an impact on quantum-enhanced atomic interferometry in a lattice.
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