量子棘轮与光学超晶格量子通信
Quantum Ratchets for Quantum Communication with Optical Superlattices
摘要：
我们提出利用量子棘轮在光学超晶格中的原子链中传输量子信息。量子棘轮是由光学超晶格的连续调制产生的，这种调制在时间和空间上都是周期性的。尽管作用在原子上的平均力为零，我们证明了棘轮效应确实允许原子在偶数和奇数位置上沿相反的方向运动。通过在光晶格中加载二能级玻色子原子，该方案允许将压印在一个或多个原子中的量子比特或纠缠态完美地传输到晶格中的任何期望位置。从量子计算的角度来看，传输是通过完美交换门的平滑级联来实现的。我们分析设置与非相互作用和相互作用的粒子，在后者的情况下，我们使用的工具，最优控制设计最佳的调制。我们还讨论了该方法在当前实验中的可行性。
英文摘要：
We propose to use a quantum ratchet to transport quantum information in a chain of atoms trapped in an optical superlattice. The quantum ratchet is created by a continuous modulation of the optical superlattice which is periodic in time and in space. Though there is zero average force acting on the atoms, we show that indeed the ratchet effect permits atoms on even and odd sites to move along opposite directions. By loading the optical lattice with two-level bosonic atoms, this scheme permits to perfectly transport a qubit or entangled state imprinted in one or more atoms to any desired position in the lattice. From the quantum computation point of view, the transport is achieved by a smooth concatenation of perfect swap gates. We analyze setups with noninteracting and interacting particles and in the latter case we use the tools of optimal control to design optimal modulations. We also discuss the feasibility of this method in current experiments.
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