30 citations · 59 across the 13 of their papers we have counts for
14 papers
Demonstration of length control for a filter cavity with coherent control sidebands
Naoki Aritomi, Yuhang Zhao, Eleonora Capocasa +22
For broadband quantum noise reduction of gravitational-wave detectors, a frequency-dependent squeezed vacuum field realized using a filter cavity is the most promising technique an…
Quantum sensor network metrology with bright solitons
Dmitriy Tsarev, Stepan Osipov, Ray-Kuang Lee +2
We consider multiparameter quantum metrology problem with bright soliton networks in the presence of weak losses. We introduce General Heisenberg Limit (GHL) $σ_{\boldsymbolχ}=1/N^…
Generation of heralded optical `Schroedinger cat' states by photon-addition
Yi-Ru Chen, Hsien-Yi Hsieh, Jingyu Ning +7
Optical "Schrödinger cat" states, the non-classical superposition of two quasi-classical coherent states, serve as a basis for gedanken experiments testing quantum physics on mesos…
Direct parameter estimations from machine-learning enhanced quantum state tomography
Hsien-Yi Hsieh, Jingyu Ning, Yi-Ru Chen +4
With the capability to find the best fit to arbitrarily complicated data patterns, machine-learning (ML) enhanced quantum state tomography (QST) has demonstrated its advantages in…
Improving the stability of frequency dependent squeezing with bichromatic control of filter cavity length, alignment and incident beam pointing
Yuhang Zhao, Eleonora Capocasa, Marc Eisenmann +21
Frequency dependent squeezing is the main upgrade for achieving broadband quantum noise reduction in upcoming observation runs of gravitational wave detectors. The proper frequency…
Experimental Demonstration of Topological Charge Protection in Wigner Current
Yi-Ru Chen, Hsien-Yi Hsieh, Jingyu Ning +7
We experimentally reconstruct Wigner's current of quantum phase space dynamics for the first time. We reveal the ``push-and-pull" associated with damping and diffusion due to the c…
Internal nonlocality in generally dilated Hermiticity
Minyi Huang, Ray-Kuang Lee
According to von Neumann, the global Hamiltonian of whole universe must be Hermitian in order to keep the eigenvalues real and to construct a self-consistent quantum theory. In add…
Extract the Degradation Information in Squeezed States with Machine Learning
Hsien-Yi Hsieh, Yi-Ru Chen, Hsun-Chung Wu +5
In order to leverage the full power of quantum noise squeezing with unavoidable decoherence, a complete understanding of the degradation in the purity of squeezed light is demanded…
Solvable dilation model of -symmetric systems
Minyi Huang, Ray-Kuang Lee, Qing-hai Wang +2
The dilation method is a practical way to experimentally simulate non-Hermitian, especially -symmetric quantum systems. However, the time-dependent dilation problem cannot…
On the Formation of Lines in Quantum Phase Space
Ole Steuernagel, Popo Yang, Ray-Kuang Lee
We study the formation of lines in phase space in Wigner's distribution Whereas lines in phase space do not form in classical systems, unless special initial states are chosen…
Extracting the internal nonlocality from the dilated Hermiticity
Minyi Huang, Ray-Kuang Lee, Junde Wu
To effectively realize a -symmetric system, one can dilate a -symmetric Hamiltonian to some global Hermitian one and simulate its evolution in the dilated Hermiti…
Probing topological protected transport in finite-sized Su-Schrieffer-Heeger chains
Yu-Han Chang, Nadia Daniela Rivera Torres, Santiago Figueroa Manrique +9
In order to transport information with topological protection, we reveal and demonstrate experimentally the existence of a characteristic length , coined as the transport leng…
Quantum Harmonic Oscillators with Nonlinear Effective Masses
Jen-Hsu Chang, Chun-Yan Lin, Ray-Kuang Lee
We study the eigen-energy and eigen-function of a quantum particle acquiring the probability density-dependent effective mass (DDEM) in harmonic oscillators. Instead of discrete ei…
The Wigner flow on the sphere
P. Yang, I. F. Valtierra, A. B. Klimov +4
We derive a continuity equation for the evolution of the SU(2) Wigner function under nonlinear Kerr evolution. We give explicit expressions for the resulting quantum Wigner current…