Experimentally generating and tuning robust entanglement between photonic qubits

Autor(en)

Benjamin P Lanyon, Nathan Langford

Abstrakt

We introduce and demonstrate a technique for generating a range of novel multi-photon entangled states. Adjusting a simple experimental parameter allows the preparation of pure states with an arbitrary level of W-class entanglement, from a fully separable state to the maximally robust W state, enabling full control over this entanglement class in our system. Furthermore, the generated states exhibit a highly symmetric entanglement distribution that we show is optimally robust against qubit loss. The ability to prepare entanglement in robust configurations is particularly relevant to many emerging quantum technologies where entanglement is a valuable resource. We achieve a high quality experimental realization for the three-photon case, including a W state fidelity of 0.90±0.03. In addition, we present a new technique for characterizing quantum states in the laboratory in the form of iterative tomography.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

University of Queensland

Journal

New Journal of Physics

Band

11

Anzahl der Seiten

9

ISSN

1367-2630

DOI

https://doi.org/10.1088/1367-2630/11/1/013008

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

103026 Quantenoptik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/8d3d3ae7-0e60-4686-849f-05d84b876e0a