Southwest Quantum Information and Technology

A completely non-classical treatment of homodyne measurements

Presenting Author: Noah Lordi, University of Colorado
Contributing Author(s): Eugene Tsao, Scott Diddams, Austin Lund, Josh Combes

Homodyne measurements are popular in both classical and quantum contexts. Traditional homodyne measurements use a strong coherent local oscillator and limit to a field quadrature measurement. The same apparatus can be utilized with various local oscillator states to produce unique and useful measurements. We consider injecting coherent state superpositions, photon number states, and more nonclassical states. Using these novel local oscillators we can construct measurements of logical operators and stabilizers for GKP qubits among other unique measurements. We are able to analyze the resulting measurements through their Kraus representations. This gives a complete picture of the measurement outcomes and post-measurement states.

(Session 5 : Thursday from 5:00 pm - 7:00 pm)