# Events by date

## Tuesday, April 24, 2018

### PhD Seminar • Quantum Computing — Dissipative Quantum Search

Tuesday, April 24, 2018 — 1:00 PM EDT

Chunhao Wang, PhD candidate
David R. Cheriton School of Computer Science

We give a dissipative quantum search algorithm that is based on a novel dissipative query model. If there are $N$ items and $M$ of them are marked, this algorithm performs a fixed-point quantum search using $O(\sqrt{N/M}\log(1/\epsilon))$ queries with error bounded by $\epsilon$. In addition, we present a continuous-time version of this algorithm in terms of Lindblad evolution.

### PhD Seminar • Quantum Computing — A Quantum Algorithm for Simulating Non-sparse Hamiltonians

Tuesday, April 24, 2018 — 2:00 PM EDT

Chunhao Wang, PhD candidate
David R. Cheriton School of Computer Science

We present a quantum algorithm for simulating the dynamics of Hamiltonians that are not necessarily sparse. Our algorithm is based on the assumption that the entries of the Hamiltonian are stored in a data structure that allows for the efficient preparation of states that encode the rows of the Hamiltonian. We use a linear combination of quantum walks to achieve a poly-logarithmic dependence on the precision.

### October 2022

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