论文标题
产生最低能量纠缠状态
Generation of minimum energy entangled states
论文作者
论文摘要
利用双方纠缠的量子技术可以通过使用给定纠缠程度的最低能量的状态来提高效率。在这里,我们研究了如何通过将统一转换应用于其基态或通过基于零温度的热化协议,基于打开和关闭子系统之间合适的交互作用的零温度热化协议来实现任意有限维度的两部分系统。特别是,我们明确确定了三个可能的统一操作员和五个可能的交互条款。一方面,从本地基础操作和一个非局部性的单位操作方面,三个统一转换中的两个很容易分解,从而使它们的实现更加容易。另一方面,由于可以轻松地适应热化程序来产生许多不同的状态,因此我们从数值上表明,对于每个程度的纠缠,产生最低能量的纠缠状态成本,通常少于其他绝大多数州。
Quantum technologies exploiting bipartite entanglement could be made more efficient by using states having the minimum amount of energy for a given entanglement degree. Here, we study how to generate these states in the case of a bipartite system of arbitrary finite dimension either by applying a unitary transformation to its ground state or through a zero-temperature thermalization protocol based on turning on and off a suitable interaction term between the subsystems. In particular, we explicitly identify three possible unitary operators and five possible interaction terms. On one hand, two of the three unitary transformations turn out to be easily decomposable in terms of local elementary operations and a single nonlocal one, making their implementation easier. On the other hand, since the thermalization procedures can be easily adapted to generate many different states, we numerically show that, for each degree of entanglement, generating minimum-energy entangled states costs, in general, less than generating the vast majority of the other states.