Quantum Colloquium – An Efficient Quantum Algorithm for Lattice Problems Achieving Subexponential Approximation Factor

Sep 21, 2021 11:00 am – 12:30 pm 

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Sean Hallgren (Penn State University & Senior Visitor at Simons Institute 2021-22)

We give a polynomial-time quantum algorithm for solving the Bounded Distance Decoding problem with a subexponential approximation factor on a class of integer lattices.  The quantum algorithm achieves an exponential speedup compared to the best known classical algorithm, and is the first example of an exponential speedup on a general lattice problem not connected to number theory.

Joint work with Lior Eldar.