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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cluster States from Gaussian States: Essential Diagnostic Tools for Continuous-Variable One-Way Quantum Computing

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Gonzalez-Arciniegas, Carlos [1] ; Nussenzveig, Paulo [2] ; Martinelli, Marcelo [2] ; Pfister, Olivier [1]
Total Authors: 4
[1] Univ Virginia, Dept Phys, 382 McCormick Rd, Charlottesville, VA 22904 - USA
[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: PRX QUANTUM; v. 2, n. 3 SEP 13 2021.
Web of Science Citations: 0

Continuous-variable (CV) cluster states are a universal quantum computing platform that has experimentally outscaled qubit platforms by orders of magnitude. Room-temperature implementation of CV cluster states has been achieved with quantum optics by using multimode squeezed Gaussian states. It has also been proven that fault tolerance thresholds for CV quantum computing can be reached at realistic squeezing levels. In this paper, we show that standard approaches to design and characterize CV cluster states can miss entanglement present in the system. Such hidden entanglement may be used to increase the power of a quantum computer but it can also, if undetected, hinder the successful implementation of a quantum algorithm. By a detailed analysis of the structure of Gaussian states, we derive an algorithm that reveals hidden entanglement in an arbitrary Gaussian state and optimizes its use for one-way quantum computing. (AU)

FAPESP's process: 16/50468-7 - Nanophotonics for quantum computing and precision measurements
Grantee:Paulo Alberto Nussenzveig
Support Opportunities: Regular Research Grants