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Stárek R, Mičuda M, Miková M, et al. Experimental investigation of a four-qubit linear-optical quantum logic circuit. Sci Rep. 2016;6:33475doi: 10.1038/srep33475.
Stárek, R., Mičuda, M., Miková, M., Straka, I., Dušek, M., Ježek, M., & Fiurášek, J. (2016). Experimental investigation of a four-qubit linear-optical quantum logic circuit. Scientific reports, 633475. https://doi.org/10.1038/srep33475
Stárek, R, et al. "Experimental investigation of a four-qubit linear-optical quantum logic circuit." Scientific reports vol. 6 (2016): 33475. doi: https://doi.org/10.1038/srep33475
Stárek R, Mičuda M, Miková M, Straka I, Dušek M, Ježek M, Fiurášek J. Experimental investigation of a four-qubit linear-optical quantum logic circuit. Sci Rep. 2016 Sep 20;6:33475. doi: 10.1038/srep33475. PMID: 27647176; PMCID: PMC5028834.
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Sci Rep. 2016 Sep 20;6:33475. doi: 10.1038/srep33475.

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

Scientific reports

R Stárek, M Mičuda, M Miková, I Straka, M Dušek, M Ježek, J Fiurášek

Affiliations

  1. Department of Optics, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.

PMID: 27647176 PMCID: PMC5028834 DOI: 10.1038/srep33475

Abstract

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 |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.

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