Ultracold polar molecules as qudits
Ultracold polar molecules as qudits
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DOI：
10.1088/1367-2630/ab60f4
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发表时间：
2019-09
影响因子：
3.3
通讯作者：
Rahul Sawant;J. A. Blackmore;P. D. Gregory;J. Mur-Petit;D. Jaksch;J. Aldegunde;J. Hutson;M. Tarbutt;S. Cornish
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文献类型：
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作者：
Rahul Sawant;J. A. Blackmore;P. D. Gregory;J. Mur-Petit;D. Jaksch;J. Aldegunde;J. Hutson;M. Tarbutt;S. Cornish
我们讨论了被困于光镊运动基态的超冷分子的内部结构如何被用来实现量子点。我们研究了40Ca19F和87rb133c的旋转、精细和超精细结构，它们分别是具有2Σ和1Σ电子基态的分子。在每种情况下，我们在单个旋转流形内确定适合实现四层qudit的水平子集。量子门可以通过邻近旋转流形中的能级实现双光子微波跃迁。我们讨论了由非共振激发和退相干引起的对分子量子有用性的限制。作为一个例子，我们提出了一个协议，使用维数为d = 4的分子量子来执行Deutsch算法。
We discuss how the internal structure of ultracold molecules, trapped in the motional ground state of optical tweezers, can be used to implement qudits. We explore the rotational, fine and hyperfine structure of 40Ca19F and 87Rb133Cs, which are examples of molecules with 2Σ and 1Σ electronic ground states, respectively. In each case we identify a subset of levels within a single rotational manifold suitable to implement a four-level qudit. Quantum gates can be implemented using two-photon microwave transitions via levels in a neighboring rotational manifold. We discuss limitations to the usefulness of molecular qudits, arising from off-resonant excitation and decoherence. As an example, we present a protocol for using a molecular qudit of dimension d = 4 to perform the Deutsch algorithm.