116 research outputs found
Programmable photonic time circuits for highly scalable universal unitaries
Programmable photonic circuits (PPCs) have garnered substantial interest in
achieving deep learning accelerations and universal quantum computations.
Although photonic computation using PPCs offers critical advantages, including
ultrafast operation, energy-efficient matrix calculation and room-temperature
quantum states, its poor scalability impedes the integration required for
industrial applications. This challenge arises from the temporally one-shot
operation using propagating light in conventional PPCs, which leads to the
light-speed increase of device footprints. Here we propose a concept of
programmable photonic time circuits, which employ time-cycle-based computations
analogous to the gate cycling in the von Neumann architecture and quantum
computation. As a building block, we develop a reconfigurable SU(2) time gate
composed of two resonators, which have tunable resonances and are coupled
through time-coded dual-channel gauge fields. We demonstrate universal U(N)
operations with high fidelity using the systematic assembly of the SU(2) time
gates, achieving improved scalability from O(N^2) to O(N) in both the footprint
and gate number. This result opens a pathway to industrial-level PPC
implementation in very large-scale integration.Comment: 46 pages, 6 figure
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