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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Quantum Networks with Chiral-Light-Matter Interaction in Waveguides.

Sahand Mahmoodian¹, Peter Lodahl¹, Anders S Sørensen¹

¹Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.

Physical Review Letters

|December 24, 2016

Summary

We introduce a scalable quantum network architecture using on-chip photonic circuits for efficient two-qubit measurements. This design enables high-fidelity quantum computation and entanglement generation across multiple nodes.

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Area of Science:

Quantum Information Science
Photonic Integrated Circuits
Quantum Networking

Background:

Quantum networks require efficient methods for qubit interaction and entanglement generation.
On-chip photonic circuits offer a promising platform for scalable quantum technologies.

Purpose of the Study:

To propose a scalable quantum network architecture.
To demonstrate loss-tolerant two-qubit measurements on a chip.
To achieve high-fidelity quantum gate operations for universal quantum computation.

Main Methods:

Utilizing an on-chip Mach-Zehnder interferometer with chiral light-matter interfaces.
Positioning two quantum emitters within the interferometer arms for intranode measurements.
Emitting photons from emitters for internode entanglement generation.

Main Results:

Achieved high-fidelity intranode two-qubit parity measurements within a single chip.
Demonstrated the capability to generate internode entanglement without reconfiguration.
Projected heralded two-qubit gate fidelities of approximately 0.998.

Conclusions:

The proposed architecture enables scalable quantum networks.
On-chip photonic circuits with chiral interfaces are effective for quantum information processing.
High-fidelity quantum computation is achievable in these networks.