EurekAlert July 16, 2019
A team of researchers in the US (Purdue University, Oak Ridge National Laboratory) implemented qudit gate with a set of standard off-the-shelf equipment used daily in the optical communication industry. Qudits exist in multiple states, such as 0 and 1 and 2. More states mean that more data can be encoded and processed. They achieved more entanglement with fewer photons by encoding one qudit in the time domain and the other in the frequency domain of each of the two photons. They built a gate using the two qudits encoded in each photon, for a total of four qudits in 32 dimensions, or possibilities, of both time and frequency. This gate allows us to manipulate information in a predictable and deterministic way, which means that it could perform the operations necessary for certain quantum information processing tasks…read more. Open Access TECHNICAL ARTICLE
A two-qudit gate maximizes the entanglement of photons so that quantum information can be manipulated more predictably and reliably. Credit: Purdue University image/Allison Rice