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Journal Articles Physical Review A Year : 2019

Probabilistic Fault-Tolerant Universal Quantum Computation and Sampling Problems in Continuous Variables

Abstract

Continuous-Variable (CV) devices are a promising platform for demonstrating large-scale quantum information protocols. In this framework, we define a general quantum computational model based on a CV hardware. It consists of vacuum input states, a finite set of gates - including non-Gaussian elements - and homodyne detection. We show that this model incorporates encodings sufficient for probabilistic fault-tolerant universal quantum computing. Furthermore, we show that this model can be adapted to yield sampling problems that cannot be simulated efficiently with a classical computer, unless the polynomial hierarchy collapses. This allows us to provide a simple paradigm for short-term experiments to probe quantum advantage relying on Gaussian states, homodyne detection and some form of non-Gaussian evolution. We finally address the recently introduced model of Instantaneous Quantum Computing in CV, and prove that the hardness statement is robust with respect to some experimentally relevant simplifications in the definition of that model.

Dates and versions

hal-01931759 , version 1 (23-11-2018)

Identifiers

Cite

Tom Douce, Damian Markham, Elham Kashefi, Peter van Loock, Giulia Ferrini. Probabilistic Fault-Tolerant Universal Quantum Computation and Sampling Problems in Continuous Variables. Physical Review A, 2019, 99 (1), pp.012344. ⟨10.1103/PhysRevA.99.012344⟩. ⟨hal-01931759⟩
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