Generation and symmetry control of quantum frequency combs

Abstract

High-dimensional quantum states are promising resources for quantum communication and processing. In this context the frequency degree of freedom of light combines the advantages of robustness and easy handling with standard classical telecommunication components. In this work we propose a method to generate and control the symmetry of broadband biphoton frequency states, based on the interplay of cavity effects and relative temporal delay between the two photons of each pair. We demonstrate it using an integrated AlGaAs semiconductor platform producing quantum frequency combs, working at room temperature and compliant with electrical injection. These results open interesting perspectives for the development of massively parallel and reconfigurable systems for complex quantum operations.

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

“…Furthermore, the generation and propagation of OAM states through waveguides is very demanding as well, but small steps towards the reliable on-chip transmission and source integration of such states have been proved [107,138]. As previously mentioned, frequency and path degrees of freedom are the two that can be more easily controlled and manipulated on integrated devices [139][140][141]. In the following, we are going to focus and discuss in detail two very important and impressive experiments, which use path and frequency encoded high-dimensional states respectively.…”

Integrated photon-pair sources with nonlinear optics

“…The generation of high-dimension photon states is also one of the forefronts. With the ability of generating frequency-bin high-dimensional entangled states 172,205,273,274 , the quantum frequency combs 275 based on MRRs have great potentials for the generation and the control of complex photon states on a scalable integrated platform.…”

Generation of quantum states of light in nonlinear AlGaAs chips: engineering and applications

“…These states, that have also been generated in integrated nonlinear optical resonators based on third order nonlinear optical processes, consist of discrete spectral modes and are characterized by a biphoton phase coherence guaranteed by the generation process. They constitute entangled implementation of qudit teleportation, logic gates, as well as dense coding and state discrimination [5].…”

“…This control, combined to the insertion of a temporal delay between photons of a pair, allows to switch from symmetric to anti-symmetric quantum frequency states. Figure adapted from [5] under Creative Common License. qudits, i.e.…”