TY - JOUR AU - Crespi, Andrea AU - Ramponi, Roberta AU - Osellame, Roberto AU - Sansoni, Linda AU - Bongioanni, Irene AU - Sciarrino, Fabio AU - Vallone, Giuseppe AU - Mataloni, Paolo PY - 2011 DA - 2011// TI - Integrated photonic quantum gates for polarization qubits T2 - Nat. Comm. JO - Nature Communications SP - 6 VL - 2 IS - 566 KW - fromIPMRAS AB - 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. N1 - exported from refbase (https://db.rplab.ru/refbase/show.php?record=765), last updated on Sun, 06 May 2012 16:42:44 -0500 ID - Crespi_etal2011 ER -