Journal
NPJ QUANTUM INFORMATION
Volume 4, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41534-018-0068-0
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Funding
- European Commission through EQUAM [323714]
- European Commission through PICQUE [608062]
- European Commission through QUCHIP [641039]
- Austrian Science Fund (FWF) through START [Y585-N20]
- Austrian Science Fund (FWF) through CoQuS [W1210-4]
- Austrian Science Fund (FWF) through NaMuG [P30067-N36]
- U.S. Air Force Office of Scientific Research [FA2386-17-1-4011]
- German Research foundation [SZ 276/12-1, BL 574/13-1]
- Austrian Science Fund (FWF) [Y 585, P 30067] Funding Source: researchfish
- Austrian Science Fund (FWF) [P30067, W1210] Funding Source: Austrian Science Fund (FWF)
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Recent progress in integrated-optics technology has made photonics a promising platform for quantum networks and quantum computation protocols. Integrated optical circuits are characterized by small device footprints and unrivalled intrinsic interferometric stability. Here, we take advantage of femtosecond-laser-written waveguides' ability to process polarization-encoded qubits and present an implementation of a heralded controlled-NOT gate on chip. We evaluate the gate performance in the computational basis and a superposition basis, showing that the gate can create polarization entanglement between two photons. Transmission through the integrated device is optimized using thermally expanded core fibers and adiabatically reduced mode-field diameters at the waveguide facets. This demonstration underlines the feasibility of integrated quantum gates for all-optical quantum networks and quantum repeaters.
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