Partially-Blind Single-Qubit Classification over a Prototype Hybrid Quantum Network

arXiv (Cornell University)

Abstract

In the NISQ era, there is a need for resource-efficient proof-of-principle experiments that can be built up to genuine utility. Single-qubit classifiers (SQCs) are small-scale hybrid quantum-classical machines capable of performing a basic machine learning task: classifying data. In principle, these can be scaled up to many-qubit quantum classifiers capable of quantum computational advantage. Another type of quantum advantage is enabled by blind quantum computation (BQC), wherein a client may run delegated quantum computations on an untrusted server with information-theoretic security. In this paper, we develop a framework and propose a prototype experiment for a SQC where it is known to the server that a classification is being performed, but the data and outcome stay hidden, i.e., it performs partially-blind SQC (PB-SQC). This can be integrated into a quantum network to deliver quantum-secured classifications to remote clients; we study this for a heterogeneous quantum network link in which entanglement is shared between a server and a client equipped with a multiplexed solid-state quantum memory using entanglement swapping. The framework we develop for PB-SQC on this setup is tested in a simulation with realistic hardware parameters on a real-world credit card transaction fraud database with classification outcomes approaching those of its equivalent classical deep-belief network. In addition, we show how a two-qubit classifier (TQC) instead of a SQC enables verification of the computation. These results pave the way towards a short- to mid-term quantum network offering use-case-ready quantum applications.

Authors 7

1. Matteo Pasini

   Institute of Photonic Sciences · Barcelona Institute of Science and Technology

   Affiliation as printed

   ICFO-Institut de Ciencies Fotoniques , The Barcelona Institute of Science and Technology , Castelldefels (Barcelona ) 08860 , Spain

2. Tzula B. Propp Aachen

   Leiden University · University of Applied Sciences Leiden

   Affiliation as printed

   LION-Leiden Institute of Physics , Leiden University , 2333 CA Leiden , The Netherlands

3. Janice van Dam

   QuTech · Delft University of Technology

   Affiliation as printed

   Kavli Institute of Nanoscience , Delft University of Technology , Delft , The Netherlands

   QuTech , Delft University of Technology , Delft , The Netherlands

4. Garazi Muguruza Lasa
   Affiliation as printed

   SURF-Collaborating University Computing Facilities , 3511EP Utrecht , The Netherlands

5. Alexandre Wanick

   Pontifícia Universidade Católica do Rio de Janeiro

   Affiliation as printed

   NITeQ-Interdisciplinary Nucleus for Quantum Technologies , PUC-Rio-Pontifical Catholic University of Rio de Janeiro , 22451-900 Rio de Janeiro , Brazil

6. Hugues de Riedmatten

   Institució Catalana de Recerca i Estudis Avançats · Institute of Photonic Sciences · Barcelona Institute of Science and Technology

   Affiliation as printed

   ICFO-Institut de Ciencies Fotoniques , The Barcelona Institute of Science and Technology , Castelldefels (Barcelona ) 08860 , Spain

   ICREA-Institucio Catalana de Recerca i Estudis Avançats , 08015 Barcelona , Spain

7. Gustavo Castro do Amaral