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Sub-Universal Quantum Circuits in Continuous Variables

Total Cost €


EC-Contrib. €






Project "CV SUBUNIQC" data sheet

The following table provides information about the project.


Organization address
address: SAARSTRASSE 21
city: MAINZ
postcode: 55122

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Project website
 Total cost 171˙460 €
 EC max contribution 171˙460 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2015
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2016
 Duration (year-month-day) from 2016-07-01   to  2018-06-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

'Three decades ago, it was proposed that quantum computers (i.e. quantum systems where information can be encoded, processed and read out) could outperform classical devices for information processing. For instance, they may allow the factoring of integer numbers in a time which scales polynomially with the size of the input, while known classical algorithms require an exponential time. However, in practice, it has not yet been possible to build a quantum computer large enough to beat classical machines. This has raised the question as to whether this difficulty is only technical, and will be overcome one day, or due to fundamental reasons. In trying to answer this question, physicists and computer scientists have developed 'sub-universal' quantum computing models, which aim at solving very specific problems, simpler than factoring, but still displaying a quantum advantage. Among those is the so-called boson sampling protocol, which enables to compute the permanent of a unitary matrix. In other words, scientists now seek for the observation of a minimal supremacy of quantum computers over classical ones. Inspired by recent experimental achievements (Paris, Japan, Virginia), in this project I will study at the theoretical level new models of sub-universal quantum computers, based on original photonic architectures. Indeed, these models have been only poorly studied, so far, in the promising context of the 'Continuous Variable' (CV) encoding, which has recently allowed to reach the record-size for quantum computing resource states. This project articulates through two main objectives: 1) The design of new sub-universal quantum circuits in CV, providing proof of their classical computational hardness 2) The study of viable experimental quantum optics platforms where these protocols may be efficiently implemented. Among those, I will design the first experimentally accessible protocol for CV boson sampling.'


year authors and title journal last update
List of publications.
2017 Francesco Arzani, Nicolas Treps, Giulia Ferrini
Polynomial approximation of non-Gaussian unitaries by counting one photon at a time
published pages: 52352, ISSN: 2469-9926, DOI: 10.1103/PhysRevA.95.052352
Physical Review A 95/5 2019-06-13
2017 U. Chabaud, T. Douce, D. Markham, P. van Loock, E. Kashefi, G. Ferrini
Continuous-variable sampling from photon-added or photon-subtracted squeezed states
published pages: 62307, ISSN: 2469-9926, DOI: 10.1103/PhysRevA.96.062307
Physical Review A 96/6 2019-06-13
2017 T. Douce, D. Markham, E. Kashefi, E. Diamanti, T. Coudreau, P. Milman, P. van Loock, G. Ferrini
Continuous-Variable Instantaneous Quantum Computing is Hard to Sample
published pages: 70503, ISSN: 0031-9007, DOI: 10.1103/PhysRevLett.118.070503
Physical Review Letters 118/7 2019-06-13
2016 G. Ferrini, J. Roslund, F. Arzani, C. Fabre, N. Treps
Direct approach to Gaussian measurement based quantum computation
published pages: 62332, ISSN: 2469-9926, DOI: 10.1103/PhysRevA.94.062332
Physical Review A 94/6 2019-06-13
2017 Y. Cai, J. Roslund, G. Ferrini, F. Arzani, X. Xu, C. Fabre, N. Treps
Multimode entanglement in reconfigurable graph states using optical frequency combs
published pages: 15645, ISSN: 2041-1723, DOI: 10.1038/ncomms15645
Nature Communications 8 2019-06-13

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