Photon Frequency Bears More At Less

TL;DR

This paper demonstrates a scalable optical quantum computer design utilizing the frequency degree of freedom of light, enabling efficient quantum logic operations with a single photon and showing practical implementation of the Deutsch-Jozsa algorithm.

Contribution

It introduces a frequency-based approach for optical quantum computing that simplifies scalability by using a single port and in-line modules for quantum logic gates.

Findings

Frequency basis allows multiple qubits in a single photon state.

Scalable design with minimal ports and in-line modules.

Successful implementation of Deutsch-Jozsa algorithm.

Abstract

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-Jozsa's algorithm using standard laboratory laser demonstrates that fre-quency-basis OQC is ideally suited for such tasks even without help of nonclassicality of light.