High-dimensional (HD) photonic quantum information (QI) promises considerable advantages compared to the 2D qubit paradigm, from increased quantum communication rates to increased robustness for entanglement distribution. QuICHE aims to unlock the potential of HD QI by encoding information in the spectral-temporal (ST) degrees of freedom of light. ST control of quantum states of light enables multiplexing of QI in a single spatial mode, ideally suited for guided-wave communications and integrated devices. QI encoding in HD states has been recognized as a promising way towards enhanced QI processing, communication, and sensing. In QuICHE matched experimental tools and theoretical architectures for manipulating and characterizing such states will be developed, and their use will be demonstrated in various applications.
- HD encoding and multiplexing schemes in time and frequency for quantum protocols with single systems (QKD, channel capacities, dimension witnesses)
- HD schemes for quantum protocols with composite systems (Superdense coding, Bell violation, entanglement witness, conditional non-classicality)
- Interfaces between ST encodings using quantum temporal imaging and memories (Hybrid encoding networks, low-loss encoding conversion, conversion of time scales)