Estimating Purity and Entropy in Stabilizer State Experiments - Quantum PhysicsReport as inadecuate




Estimating Purity and Entropy in Stabilizer State Experiments - Quantum Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Many experiments in quantum information aim at creating graph states.Quantifying the purity of an experimentally achieved graph state could inprinciple be accomplished using full-state tomography. This method requires anumber of measurement settings growing exponentially with the number ofconstituents involved. Thus, full-state tomography becomes experimentallyinfeasible even for a moderate number of qubits.In this paper we present a method to estimate the purity of experimentallyachieved graph states with simple measurements. The observables we consider arethe stabilizers of the underlying graph. Then, we formulate the problem as:-What is the state with the least purity that is compatible with themeasurement data?- We solve this problem analytically and compare the obtainedbounds with results from full-state tomography for simulated data.



Author: Harald Wunderlich, Martin B. Plenio

Source: https://arxiv.org/







Related documents