Experimental investigation of a four-qubit linear-optical quantum logic circuit

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33159744" target="_blank" >RIV/61989592:15310/16:33159744 - isvavai.cz</a>
Result on the web
<a href="http://www.nature.com/articles/srep33475" target="_blank" >http://www.nature.com/articles/srep33475</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/srep33475" target="_blank" >10.1038/srep33475</a>

Result language
angličtina
Original language name
Experimental investigation of a four-qubit linear-optical quantum logic circuit
Original language description
We experimentally demonstrate and characterize a four-qubit linear-optical quantum logic circuit. Our robust and versatile scheme exploits encoding of two qubits into polarization and path degrees of single photons and involves two crossed inherently stable interferometers. This approach allows us to design a complex quantum logic circuit that combines a genuine four-qubit C(3)Z gate and several two-qubit and single-qubit gates. The C(3)Z gate introduces a sign flip if and only if all four qubits are in the computational state vertical bar 1 >. We verify high-fidelity performance of this central four-qubit gate using Hofmann bounds on quantum gate fidelity and Monte Carlo fidelity sampling. We also experimentally demonstrate that the quantum logic circuit can generate genuine multipartite entanglement and we certify the entanglement with the use of suitably tailored entanglement witnesses.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BH - Optics, masers and lasers
OECD FORD branch
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Project
<a href="/en/project/GA16-17314S" target="_blank" >GA16-17314S: Complex multiqubit optical quantum logic gates</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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