Discrete spatial entanglement in multimode nonlinear waveguides (Conference Presentation)

Michal Jachura; Michal Karpinski; Konrad Banaszek; Divya Bharadwaj; Jasleen Lugani; Krishna Thyagarajan

doi:10.1117/12.2287422

14 March 2018 Discrete spatial entanglement in multimode nonlinear waveguides (Conference Presentation)

Michal Jachura, Michal Karpinski, Konrad Banaszek, Divya Bharadwaj, Jasleen Lugani, Krishna Thyagarajan

Proceedings Volume 10540, Quantum Sensing and Nano Electronics and Photonics XV; 1054028 (2018) https://doi.org/10.1117/12.2287422
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

We present a scheme for generation and characterization of entangled spatial qubits based on type-II spontaneous parametric down-conversion (SPDC) in a periodically poled titanyl phosphate (PPKTP) multimode nonlinear waveguide [1]. Our scheme exploits intermodal dispersion which has been hitherto successfully employed to produce spatially pure SPDC photon pairs from a multimode waveguide without spatial filtering [2]. Production of discrete entanglement relies on driving simultaneously two SPDC processes that involve different combinations of transverse spatial modes for which phase matching bandwidths significantly overlap. We propose a procedure for experimental identification of the spatial qubit subspace based on a scan of the spatial Wigner function via the displaced parity measurement using an inverting Sagnac interferometer and photon counting. We numerically verified the robustness of the mode reconstruction procedure against experimental imperfections. We also propose an experimental method for detecting spatial entanglement in the position-wave vector phase space. Numerical simulations indicate that waveguide parameters required for experimental demonstrations are compatible with current manufacturing capabilities. Using simulated mode profiles we calculate the maximum attainable Clauser-Horne- Shimony-Holt combination value reaching 2.12, which clearly violates the classical limit and confirms the feasibility of observing non-classical features of the generated state. [1] M. Jachura et al. Physical Review A, 95, 032322 (2017). [2] M. Jachura, M. Karpiński, C. Radzewicz, K. Banaszek, Optics Express, 22, 8624-8632 (2014).

Conference Presentation

Citation Download Citation

Michal Jachura, Michal Karpinski, Konrad Banaszek, Divya Bharadwaj, Jasleen Lugani, and Krishna Thyagarajan "Discrete spatial entanglement in multimode nonlinear waveguides (Conference Presentation)", Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 1054028 (14 March 2018); https://doi.org/10.1117/12.2287422

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Waveguides

Imaging spectroscopy

Quantum communications

Quantum cryptography

Quantum dot lasers

Quantum dots

Quantum wells

Show All Keywords

Keywords/Phrases

Search In:

Publication Years