NewsPhysics

Researchers have experimentally demonstrated the first bidirectional quantum analog-to-digital converter (QADC), capable of transforming a photon's properties, such as its wavefront, into discrete qubits and vice versa. This breakthrough is crucial for integrating continuous quantum signals, like light, with qubit-based quantum information processing systems, which operate with discrete states. The ability to encode and decode information between these two domains opens new avenues for hybrid quantum computing and communication.

The developed device employs a novel approach for conversion, allowing information encoded in a photon's spatial wavefront to be mapped onto qubit states, and for qubit states to be transformed back into wavefront patterns. This was achieved through precise manipulation of the photons' quantum properties, leveraging phenomena such as entanglement and superposition. Bidirectionality is a key feature, as most prior efforts have focused on unidirectional conversions or less versatile systems.

“This breakthrough is crucial for integrating continuous quantum signals, like light, with qubit-based quantum information processing systems, which operate with discrete states.”