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arXiv quant-ph/0407140quant-ph
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在量子计算机上实现SU(2)的高维酉表示

Implementing high dimensional unitary representations of SU(2) on a Quantum Computer

Christof Zalka

摘要:

在本文中,我们考虑了一个具有大的角动量l的系统,其状态可以用log_2(l)量子比特存储。然后问题是如何在这个表示中进行系统的空间旋转。换句话说,我们正在研究具有2l+1维的SU(2)的酉表示,并且希望使用log(l)中的资源多项式来实现这些变换。我们只给出了一个草图,我们的解决方案,其中涉及“存储”离散球谐函数Y_{l,m}(θ,φ)在量子寄存器。在建设中也有一些技术差距,但它们是基于合理的假设。我们的方法是相当繁琐的,我们希望有人会找到一个更好的解决方案。关于我们试图做的事情的一个很好的、基本的解释(不涉及物理学或表示论),请参见4.6.2节。

英文摘要:

In this note we consider a system with a large angular momentum l whose state we can store using some log_2(l) qubits. The problem then is how to carry out spatial rotations of the system in this representation. In other words we are looking at a unitary representation of SU(2) with dimension 2l+1 and want to implement these transformations with resources polynomial in log(l). We only give a sketch of our solution which involves ``storing'' discretised spherical harmonic functions Y_{l,m}(Theta,phi) in a quantum register. Also there are some technical gaps in the construction, but they are based on plausible assumptions. Our approach is rather cumbersome and we hope somebody will find a nicer solution. For a nice, elementary explanation of what we are trying to do (not involving physics or representation theory) see section 4.6.2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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