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.

Integrated photonic quantum gates for polarization qubits / Andrea, Crespi; Roberta, Ramponi; Roberto, Osellame; Sansoni, Linda; Bongioanni, Irene; Sciarrino, Fabio; Vallone, Giuseppe; Mataloni, Paolo. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 2:1(2011), p. 566. [10.1038/ncomms1570]

Integrated photonic quantum gates for polarization qubits

SANSONI, LINDA;BONGIOANNI, IRENE;SCIARRINO, Fabio;VALLONE, GIUSEPPE;MATALONI, Paolo
2011

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.
2011
01 Pubblicazione su rivista::01a Articolo in rivista
Integrated photonic quantum gates for polarization qubits / Andrea, Crespi; Roberta, Ramponi; Roberto, Osellame; Sansoni, Linda; Bongioanni, Irene; Sciarrino, Fabio; Vallone, Giuseppe; Mataloni, Paolo. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 2:1(2011), p. 566. [10.1038/ncomms1570]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/434391
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