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PLDI 2020
Mon 15 - Fri 19 June 2020
Thu 18 Jun 2020 15:20 - 15:40 at PLDI Research Papers live stream - Language Design I Chair(s): Adrian Sampson

Variational Quantum Circuits (VQCs), or the so-called quantum neural-networks, are predicted to be one of the most important near-term quantum applications, not only because of their similar promises as classical neural-networks, but also because of their feasibility on near-term noisy intermediate-size quantum (NISQ) machines. The need for gradient information in the training procedure of VQC applications has stimulated the development of auto-differentiation techniques for quantum circuits. We propose the first formalization of this technique, not only in the context of quantum circuits but also for imperative quantum programs (e.g., with controls), inspired by the success of differentiable programming languages in classical machine learning. In particular, we overcome a few unique difficulties caused by exotic quantum features (such as quantum no-cloning) and provide a rigorous formulation of differentiation applied to bounded-loop imperative quantum programs, its code-transformation rules, as well as a sound logic to reason about their correctness. Moreover, we have implemented our code transformation in OCaml and demonstrated the resource-efficiency of our scheme both analytically and empirically. We also conduct a case study of training a VQC instance with controls, which shows the advantage of our scheme over existing auto-differentiation for quantum circuits without controls.

Thu 18 Jun
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14:20 - 15:40: Language Design IPLDI Research Papers at PLDI Research Papers live stream
Chair(s): Adrian SampsonCornell University, USA

YouTube lightning session video

14:20 - 14:40
PLDI Research Papers
Benjamin BichselETH Zurich, Switzerland, Maximilian BaaderETH Zurich, Switzerland, Timon GehrETH Zurich, Switzerland, Martin VechevETH Zurich, Switzerland
14:40 - 15:00
PLDI Research Papers
Thomas BourgeatMassachusetts Institute of Technology, USA, Clément Pit-ClaudelMassachusetts Institute of Technology, USA, Adam ChlipalaMassachusetts Institute of Technology, ArvindMassachusetts Institute of Technology, USA
15:00 - 15:20
PLDI Research Papers
Fabian SchuikiETH Zurich, Switzerland, Andreas KurthETH Zurich, Switzerland, Tobias GrosserETH Zurich, Switzerland, Luca BeniniETH Zurich, Switzerland
Link to publication Pre-print
15:20 - 15:40
PLDI Research Papers
Shaopeng ZhuUniversity of Maryland, USA, Shih-Han HungUniversity of Maryland, USA, Shouvanik ChakrabartiUniversity of Maryland, USA, Xiaodi WuUniversity of Maryland, USA