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Programmable frequency-bin quantum states in a nano-engineered silicon device

Marco ClementiFederico A. SabattoliMassimo Borghi ...+11 Daniele Bajoni
Dec 2022
摘要
Photonic qubits should be controllable on-chip and noise-tolerant whentransmitted over optical networks for practical applications. Furthermore,qubit sources should be programmable and have high brightness to be useful forquantum algorithms and grant resilience to losses. However, widespread encodingschemes only combine at most two of these properties. Here, we overcome thishurdle by demonstrating a programmable silicon nano-photonic chip generatingfrequency-bin entangled photons, an encoding scheme compatible with long-rangetransmission over optical links. The emitted quantum states can be manipulatedusing existing telecommunication components, including active devices that canbe integrated in silicon photonics. As a demonstration, we show our chip can beprogrammed to generate the four computational basis states, and the fourmaximally-entangled Bell states, of a two-qubits system. Our device combinesall the key-properties of on-chip state reconfigurability and denseintegration, while ensuring high brightness, fidelity, and purity.
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