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arXiv quant-ph/0608200quant-ph
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离散Wigner函数中的干涉

Interference in discrete Wigner functions

Cecilia Cormick, Juan Pablo Paz

摘要:

我们分析了Gibbons等人最近引入的一类离散Wigner函数的一些特征,该函数用于表示素数幂维Hilbert空间系统的量子态[Phys.Rev.A70,062101(2004)]。我们认为“猫”的状态获得的相干叠加态与正维格纳函数,对于这样的状态,我们表明,离散维格纳函数的振荡通常分布在整个离散相空间(包括两个干扰状态本地化的区域)。这是一个通用的属性,这是在鲜明的对比,通常的维格纳函数,使他们有用的候选人,以显示存在的量子相干性通过振荡的属性。然而,它是可能的猫状态的子集与自然的相空间表示,其中的振荡区域保持本地化。我们表明,这可以做到有趣的家庭中使用的量子纠错码的稳定状态,并说明这一点,通过分析的相空间表示的五量子位纠错码。

英文摘要:

We analyse some features of the class of discrete Wigner functions that was recently introduced by Gibbons et al. to represent quantum states of systems with power-of-prime dimensional Hilbert spaces [Phys. Rev. A 70, 062101 (2004)]. We consider "cat" states obtained as coherent superpositions of states with positive Wigner function; for such states we show that the oscillations of the discrete Wigner function typically spread over the entire discrete phase-space (including the regions where the two interfering states are localized). This is a generic property which is in sharp contrast with the usual attributes of Wigner functions that make them useful candidates to display the existence of quantum coherence through oscillations. However, it is possible to find subsets of cat states with a natural phase-space representation, in which the oscillatory regions remain localized. We show that this can be done for interesting families of stabilizer states used in quantum error-correcting codes, and illustrate this by analysing the phase-space representation of the five-qubit error-correcting code.

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