Silicon photonic processor of two-qubit entangling quantum logic

Understand

Entanglement is a fundamental property of quantum mechanics, and is a primary resource in quantum information systems.

• Its manipulation remains a central challenge in the development of quantum technology.
• In this work, we demonstrate a device which can generate, manipulate, and analyse two-qubit entangled states, using miniature and mass-manufacturable silicon photonics.
• By combining four photon-pair sources with a reconfigurable six-mode interferometer, embedding a switchable entangling gate, we generate two-qubit entangled states, manipulate their entanglement, and analyse them, all in the same silicon chip.