# Quantum Photonic Node for On-Chip State Transfer

## TL;DR

This paper presents a novel quantum photonic node design that enables high-fidelity, on-chip quantum state transfer between distant nodes using cascaded microring resonators, without requiring dynamic control.

## Contribution

The work introduces a new quantum photonic node architecture with cascaded resonators that achieves near-unity success rate for on-chip state transfer without dynamic control.

## Key findings

- All emission can be funneled into the waveguide with time-reversal symmetry.
- Theoretical demonstration of near-unity success rate for state transfer.
- Discussion of experimental implementation with CMOS-compatible platforms.

## Abstract

Integrated quantum photonics hold the promise to scale up the system size and form an on-chip quantum network with distributed information processing and simulation units. An outstanding need of such quantum network is to have high fidelity and efficiency on-chip state transfer between distant nodes. Although the nodes are naturally connected via waveguides, it is challenging to fulfill this need because stringent conditions such as spatial mode-matching configuration and time-reversal symmetry have to be satisfied. Here we report a type of quantum photonic nodes consisting of single quantum emitters and cascaded microring resonators for on-chip state transfer. By interfacing the node with a waveguide, we show that all the emission from the node can be funneled into the waveguide and its temporal profile can be synthesized to be time-reversal symmetric. We demonstrate theoretically on-chip quantum state transfer between two distant nodes with near-unity overall success rate can be achieved without any dynamic control. Moreover, we discuss the experimental implementation of our scheme with CMOS compatible integrated photonic platforms and solid-state quantum optics techniques.