The modular multiplication operator and the quantized bakers maps

Details The modular multiplication operator and the quantized bakers maps The modular multiplication operator and the quantized bakers maps

2007-07-14

arxiv.org/abs/0707.2155v1

Phys. Rev. A 76, 042330 (2007)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.76.042330

The modular multiplication operator, a central subroutine in Shor's factoring algorithm, is shown to be a coherent superposition of two quantum bakers maps when the multiplier is 2. The classical limit of the maps being completely chaotic, it is shown that there exist perturbations that push the modular multiplication operator into regimes of generic quantum chaos with spectral fluctuations that are those of random matrices. For the initial state of relevance to Shor's algorithm we study fidelity decay due to phase and bit-flip errors in a single qubit and show exponential decay with shoulders at multiples or half-multiples of the order. A simple model is used to gain some understanding of this behavior.

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