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NLTS Hamiltonians from Good Quantum Codes

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2023-06-02

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ACM
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Anshu, Anurag, Nikolas P. Breuckmann, and Chinmay Nirkhe. "NLTS Hamiltonians from good quantum codes." In Proceedings of the 55th Annual ACM Symposium on Theory of Computing, pp. 1090-1096. 2023.

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Abstract

The NLTS (No Low-Energy Trivial State) conjecture of Freedman and Hastings [2014] posits that there exist families of Hamiltonians with all low energy states of non-trivial complexity (with complexity measured by the quantum circuit depth preparing the state). We prove this conjecture by showing that the recently discovered families of constant-rate and linear-distance QLDPC codes correspond to NLTS local Hamiltonians.

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