High-fidelity copies from a symmetric 1→2 quantum cloning machine

• Verfasst von: Siomau, Michael [VerfasserIn]
• Verfasst von: Fritzsche, Stephan [VerfasserIn]
• Titel: High-fidelity copies from a symmetric 1→2 quantum cloning machine
• Verf.angabe: M. Siomau and S. Fritzsche
• E-Jahr: 2010
• Jahr: 25 January 2010
• Fussnoten: Gesehen am 07.08.2023
• Titel Quelle: Enthalten in: The European physical journal / D
• Ort Quelle: Berlin : Springer, 1998
• Jahr Quelle: 2010
• Band/Heft Quelle: 57(2010), 2, Seite 293-300§t8
• ISSN Quelle: 1434-6079
• DOI: doi:10.1140/epjd/e2010-00032-9
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Bloch Sphere
• Sach-SW: Input State
• Sach-SW: Mutual Information
• Sach-SW: Quantum Cloning
• Sach-SW: Quantum Cryptography
• K10plus-PPN: 1854492314

Abstract

A symmetric 1→2 quantum cloning machine(QCM) is presented that provides high-fidelity copies with0.90≤ F≤0.95 for all pure (single-qubit) input statesfrom a given meridian of the Bloch sphere. Emphasize is placedespecially on the states of the (so-called) Eastern meridian, thatincludes the computational basis states |0〉,|1〉together with the diagonal state $|{+}\rangle \,=\, \frac{1}{\sqrt{2}}(|{0}\rangle \,+\, |{1}\rangle)$, for which suggested cloningtransformation is shown to be optimal. In addition, we also showhow this QCM can be utilized for eavesdropping in Bennett’s B92protocol for quantum key distribution with a substantial highersuccess rate than obtained for universal or equatorial quantumcopying.