Quantum memristors offer a promising link between quantum and neuromorphic computing, merging the nonlinear, memory-dependent characteristics of classical memristors with the unique features of quantum states. An optical quantum memristor can be implemented using a vacuum–one-photon qubit that passes through a tunable beam splitter, where the reflectivity is adjusted according to the mean photon number within the system. In this study, we present the experimental realization of a bulk quantum-optical memristor operating with single-rail coherent superposition states in the Fock basis, generated through a resonantly excited quantum dot single-photon source. We show that the device preserves the coherence of the input quantum state. Furthermore, our modular setup enables exploration of nonlinear effects that emerge when two quantum memristors are connected in sequence, providing a foundation for scalable networks of such devices aimed at developing complex neuromorphic quantum architectures.
Quantum memristor with vacuum–one-photon qubits
