Silicon photonic processor of two-qubit entangling quantum logic. (17th October 2017)

• Record Type: Journal Article
• Authors: Santagati, R; Silverstone, J W; Strain, M J; Sorel, M; Miki, S; Yamashita, T; Fujiwara, M; Sasaki, M; Terai, H; Tanner, M G; Natarajan, C M; Hadfield, R H; O'Brien, J L; Thompson, M G
• Is Part Of: Journal of optics. Volume 19:Number 11(2017:Nov.)
• Publication Date: 2017-10-17
• Subjects: silicon quantum photonics -- integrated quantum information processing -- entanglement -- photonic qubits -- quantum photonics; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8986/aa8d56
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: 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. Using quantum state tomography, we show how our source can produce a range of entangled and separable states, and how our switchable controlled-Z gate operates on them, entangling them or making them separable depending on its configuration.