关于量子比特相空间与离散辛结构的注记
Notes on the Qubit Phase Space and Discrete Symplectic Structures
AI总结:
本文从非对易空间视角研究量子比特离散相空间,给出 Moyal 括号的显式微分算子形式,并证明经典 Poisson 括号不满足 Jacobi 恒等式,从而确立 Moyal 括号为唯一相容辛结构,并推广到素数维 Hilbert 空间。
摘要:
我们从 Wootters 对量子比特以及更一般地有限维 Hilbert 空间的离散相空间和 Wigner 函数的构造出发,从非对易空间的角度考察这一框架,并重点关注离散相空间上的 Moyal 乘积与微分演算。特别地,量子比特相空间给出了四点非对易相空间的最简单例子。我们给出 Moyal 括号作为微分算子的显式表达式。随后,我们将由 Moyal 括号编码的量子动力学与经典动力学进行比较:我们证明经典 Poisson 括号不满足 Jacobi 恒等式,因此 Moyal 括号是唯一相容的辛结构。最后,我们将分析推广到素数维数 d 的 Hilbert 空间及其相应的 d*d 相空间。
英文摘要:
We start from Wootter's construction of discrete phase spaces and Wigner functions for qubits and more generally for finite dimensional Hilbert spaces. We look at this framework from a non-commutative space perspective and we focus on the Moyal product and the differential calculus on the discrete phase spaces. In particular, the qubit phase space provides the simplest example of a four-point non-commutative phase space. We give an explicit expression of the Moyal bracket as a differential operator. We then compare the quantum dynamics encoded by the Moyal bracket to the classical dynamics: we show that the classical Poisson bracket does not satisfy the Jacobi identity thus leaving the Moyal bracket as the only consistent symplectic structure. We finally generalizes our analysis to Hilbert spaces of prime dimensions d and their associated d*d phase spaces.
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