Quantum State Transfer in Graphs with Tails

• URL: http://arxiv.org/abs/2211.14704v1
• Date: Sun, 27 Nov 2022 03:15:02 GMT
• Title: Quantum State Transfer in Graphs with Tails
• Authors: Pierre-Antoine Bernard, Christino Tamon, Luc Vinet, Weichen Xie
• Abstract summary: We consider quantum state transfer on finite graphs which are attached to infinite paths. The finite graph represents an operational quantum system for performing useful quantum information tasks. We show that em perfect state transfer can surprisingly still occur on the finite graph even in the presence of the infinite tails.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We consider quantum state transfer on finite graphs which are attached to infinite paths. The finite graph represents an operational quantum system for performing useful quantum information tasks. In contrast, the infinite paths represent external infinite-dimensional systems which have limited (but nontrivial) interaction with the finite quantum system. We show that {\em perfect} state transfer can surprisingly still occur on the finite graph even in the presence of the infinite tails. Our techniques are based on a decoupling theorem for eventually-free Jacobi matrices, equitable partitions, and standard Lie theoretic arguments. Through these methods, we rehabilitate the notion of a dark subspace which had been so far viewed in an unflattering light.

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