Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Quadrature Histograms in Maximum Likelihood Quantum State Tomography

Published

Author(s)

Leonardo E. Silva, Scott C. Glancy, Hilma H. Macedo De Vasconcelos

Abstract

Quantum state tomography aims to determine the quantum state of a system from measured data and is an essential tool for quantum information science. When dealing with continuous variable quantum states of light, tomography is often done by measuring the field amplitudes at different optical phases using homodyne detection. The quadrature-phase homodyne measurement outputs a continuous variable, so to reduce the computational cost of tomography, researchers often discretize the measurements into histogram bin. We show that this can be done without significantly degrading the fidelity of the estimated state. This paper tests different strategies for determining the histogram bin widths. We show that computation time can be significantly reduced with little fidelity loss when the measurement operators corresponding to each histogram bin are integrated over the bin width.
Citation
Physical Review A
Volume
98
Issue
2

Keywords

quantum information, quantum tomography, homodyne detection, histogram
Created August 22, 2018, Updated November 10, 2018