Multichannel and high dimensional integrated photonic quantum memory

TL;DR

This paper presents an 11-channel integrated photonic quantum memory capable of high-dimensional and multichannel quantum storage, enabling scalable quantum networks with high fidelity and independent control over multiple photonic pulses.

Contribution

The work introduces the first multichannel integrated quantum memory with high-dimensional storage, using laser-written waveguides and on-chip electrodes for independent control.

Findings

Achieved random-access storage of three time-bin qubits with >99% fidelity.

Stored five-dimensional path-encoded quantum states with >96% fidelity.

Demonstrated multichannel operation enabling scalable quantum network components.

Abstract

Integrated photonic quantum memories are essential components for scalable quantum networks and photonic information processors. However, prior implementations have been confined to single-channel operation, limiting their capacity to manipulate multiple photonic pulses and support high-dimensional information. In this work, we introduce an 11-channel integrated quantum memory based on laser-written waveguide arrays in $^{151}$Eu$^{3+}$:Y$_2$SiO$_5$ crystals. On-chip electrode arrays enable independent control over the readout times for each channel via Stark-shift-induced atomic interference. Our device achieves random-access quantum storage of three time-bin qubits with a fidelity exceeding 99%, as well as storage of five-dimensional path-encoded quantum states with a fidelity above 96%. This multichannel integrated storage device enables versatile applications through its random access capability and lays a solid foundation for the development of high-dimensional quantum networks in integrated architectures.