Characterization of quantum states and detectors

Rajveer Nehra; Miller Eaton; Kevin Valson Jacob; Carlos Carlos Gonzalez-Arciniegas; M. S. Kim; Adriana Lita; Thomas Gerrits; Sae Woo Nam; Olivier Pfister

doi:10.1117/12.2568143

25 August 2020 Characterization of quantum states and detectors

Rajveer Nehra, Miller Eaton, Kevin Valson Jacob, Carlos Carlos Gonzalez-Arciniegas, M. S. Kim, Adriana Lita, Thomas Gerrits, Sae Woo Nam, Olivier Pfister

Author Affiliations +

Proceedings Volume 11507, Quantum Communications and Quantum Imaging XVIII; 115070C (2020) https://doi.org/10.1117/12.2568143
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Characterization of quantum states and detectors is a key task in rapidly emerging optical quantum science and technology. First, we introduce and experimentally demonstrate a noise-robust quantum state characterization protocol using photon-number-resolving (PNR) measurements. Unlike conventional continuous variable state tomography methods, our method utilizes computationally efficient semi-definite programming (SDP) and can be used to accurately reconstruct the state even after loss a known loss. The protocol is demonstrated for a weak coherent state as well as a single-photon Fock state. Next, we propose a method for characterizing a photodetector by directly reconstructing the Wigner functions of the detector’s Positive-Operator-Value-Measure (POVM) elements via weak-field homodyne technique. We also report our experimental progress on characterizing a superconducting transition-edge sensor for PNR measurements.

Conference Presentation

Citation Download Citation

Rajveer Nehra, Miller Eaton, Kevin Valson Jacob, Carlos Carlos Gonzalez-Arciniegas, M. S. Kim, Adriana Lita, Thomas Gerrits, Sae Woo Nam, and Olivier Pfister "Characterization of quantum states and detectors", Proc. SPIE 11507, Quantum Communications and Quantum Imaging XVIII, 115070C (25 August 2020); https://doi.org/10.1117/12.2568143

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