Steering of Quantum Walks through Coherent Control of High-dimensional Bi-photon Quantum Frequency Combs
Raktim Haldar, Anahita Khodadad Kashi, Michael Kues · 2021
Quantum superpositions enable quantum walks (QWs) to potentially speedup certain computational tasks such as database searches, tests of graph isomorphism, ranking nodes in a network, quantum many-body simulations, etc. [1] . To implement QWs, photonic platforms have the advantages of being robust at room temperature and immune to decoherence [2] . However, photonic circuits either require huge overhead or necessitate modifying the physical layout to attain the tunability of the QW. Recently, QWs exhibiting enhanced ballistic transport (bosonic) or strong energy confinement (fermionic) have been demonstrated [3] using high-dimensional bi-photon quantum frequency combs (QFCs) [4] , which do not require any change of the device arrangement.