Scientific Results

Integrated photonic quantum gates for polarization qubits

Year: 2011

Authors: Crespi A., Ramponi R., Osellame R., Sansoni L., Bongioanni I., Sciarrino F., Vallone G., Mataloni P.

Autors Affiliation: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci, 32, I-20133 Milano, Italy;
Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci, 32, I-20133 Milano, Italy;
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro, 5, I-00185 Roma, Italy;
Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR), Largo Enrico Fermi, 6, I-50125 Firenze, Italy;
Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Via Panisperna 89/A, Compendio del Viminale, I-00184 Roma, Italy.

Abstract: The ability to manipulate quantum states of light by integrated devices may open new perspectives both for fundamental tests of quantum mechanics and for novel technological applications. However, the technology for handling polarization-encoded qubits, the most commonly adopted approach, is still missing in quantum optical circuits. Here we demonstrate the first integrated photonic controlled-NOT (CNOT) gate for polarization-encoded qubits. This result has been enabled by the integration, based on femtosecond laser waveguide writing, of partially polarizing beam splitters on a glass chip. We characterize the logical truth table of the quantum gate demonstrating its high fidelity to the expected one. In addition, we show the ability of this gate to transform separable states into entangled ones and vice versa. Finally, the full accessibility of our device is exploited to carry out a complete characterization of the CNOT gate through a quantum process tomography.


Volume: 2      Pages from: 566  to: 566

More Information: This work was supported by PRIN 2009: Circuiti Integrati per l\’Informazione Quantistica, FIRB-Futuro in Ricerca HYTEQ, ERA-Net CHISTERA-QUASAR.
KeyWords: quantum optics; quantum information; integrated optics; quantum computation; femtosecond laser
DOI: 10.1038/ncomms1570

Citations: 173
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