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Construction of an optical quantum computer (OQC) is finished by implementing all necessary ingredients with light (photon). There is, however, one more hurdle to clear. It is scalability, which is easily lost when accommodating many qubits by densely nesting quantum circuits. Any of the reported OQC schemes is not neces-sarily best placed in this regard. Here we demonstrate the power of frequency de-gree of freedom of light, which outperforms others with its potentially infinite basis states: as multiple qubits share the same one-photon superposition state all along, a realistic OQC design in frequency basis adopts only one port each for input and out-put. As such quantum logic gates are configurable in a cascade of compact in-line modules, which ensures scalable computing. Finally, our implementation of Deutsch-Jozsas algorithm using standard laboratory laser demonstrates that fre-quency-basis OQC is ideally suited for such tasks even without help of nonclassicality of light.
We demonstrate suppression and enhancement of spontaneous parametric down- conversion via quantum interference with two weak fields from a local oscillator (LO). Pairs of LO photons are observed to upconvert with high efficiency for appropriate phase
Transformers have become one of the dominant architectures in deep learning, particularly as a powerful alternative to convolutional neural networks (CNNs) in computer vision. However, Transformer training and inference in previous works can be prohi
Frequency entangled photon sources are in high demand in a variety of optical quantum technologies, including quantum key distribution, cluster state quantum computation and quantum metrology. In the recent decade, chip-scale entangled photon sources
Encoding information in the position of single photons has no known limits, given infinite resources. Using a heralded single-photon source and a Spatial Light Modulator (SLM), we steer single photons to specific positions in a virtual grid on a larg
We consider two separate atoms interacting with a single-mode optical resonator. When the frequency of the resonator field is twice the atomic transition frequency, we show that there exists a resonant coupling between textit{one} photon and textit{t