38 citations · 87 across the 4 of their papers we have counts for
13 papers · 1 filter
Classical simulation of lossy boson sampling using matrix product operators
Changhun Oh, Kyungjoo Noh, Bill Fefferman +1
Characterizing the computational advantage from noisy intermediate-scale quantum (NISQ) devices is an important task from theoretical and practical perspectives. Here, we numerical…
Field-gradient measurement using a Stern-Gerlach atomic interferometer with butterfly geometry
Changhun Oh, Hyukjoon Kwon, Liang Jiang +1
Atomic interferometers have been studied as a promising device for precise sensing of external fields. Among various configurations, a particular configuration with a butterfly-sha…
Optical estimation of unitary Gaussian processes without phase reference using Fock states
Changhun Oh, Kimin Park, Radim Filip +2
Since a general Gaussian process is phase-sensitive, a stable phase reference is required to take advantage of this feature. When the reference is missing, either due to the volati…
Optimal Distributed quantum sensing using Gaussian states
Changhun Oh, Changhyoup Lee, Seok Hyung Lie +1
We find and investigate the optimal scheme of quantum distributed Gaussian sensing for estimation of the average of independent phase shifts. We show that the ultimate sensitivity…
Using states with a large photon number variance to increase quantum Fisher information in single-mode phase estimation
Changhyoup Lee, Changhun Oh, Hyunseok Jeong +2
When estimating the phase of a single mode, the quantum Fisher information for a pure probe state is proportional to the photon number variance of the probe state. In this work, we…
Efficient Bayesian credible-region certification for quantum-state tomography
C. Oh, Y. S. Teo, H. Jeong
Standard Bayesian credible-region theory for constructing an error region on the unique estimator of an unknown state in general quantum-state tomography to calculate its size and…