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Programmable frequency-bin quantum states in a nano-engineered silicon device.

Marco Clementi^1,2, Federico Andrea Sabattoli^3,4, Massimo Borghi³

¹Dipartimento di Fisica, Università di Pavia, Via Agostino Bassi 6, 27100, Pavia, Italy. marco.clementi@epfl.ch.

Nature Communications

|January 12, 2023

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This summary is machine-generated.

Researchers developed a programmable silicon nano-photonic chip for generating frequency-bin entangled photons. This breakthrough enables on-chip control, noise tolerance, and high brightness for quantum computing applications.

Area of Science:

Quantum Information Science
Nanophotonics
Quantum Optics

Background:

Photonic qubits require on-chip control and noise tolerance for practical quantum networks.
Programmable, high-brightness qubit sources are essential for quantum algorithms and loss resilience.
Existing encoding schemes often lack multiple key properties simultaneously.

Purpose of the Study:

To demonstrate a silicon nano-photonic chip capable of generating frequency-bin entangled photons.
To overcome limitations of existing encoding schemes by combining multiple essential qubit properties.
To showcase on-chip programmability and compatibility with telecommunication infrastructure.

Main Methods:

Development of a programmable silicon nano-photonic chip.

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Generation of frequency-bin entangled photons.

Manipulation of quantum states using telecommunication components and integrated active devices.

Main Results:

Demonstrated a programmable chip generating frequency-bin entangled photons.
Showcased compatibility with long-range optical network transmission.
Successfully programmed the chip to generate four computational basis states and four Bell states for a two-qubit system.
Achieved high brightness, fidelity, and purity in the generated quantum states.

Conclusions:

The developed silicon nano-photonic chip integrates on-chip reconfigurability, dense integration, high brightness, fidelity, and purity.
This device overcomes previous limitations by combining multiple key properties for photonic qubits.
Enables practical applications in quantum computing and communication networks.