168 citations · 1.1k across the 45 of their papers we have counts for
45 papers
Gaussian Quantum Illumination via Monotone Metrics
Dong Hwan Kim, Yonggi Jo, Duk Y. Kim +5
Quantum illumination is to discern the presence or absence of a low reflectivity target, where the error probability decays exponentially in the number of copies used. When the tar…
Bound for Gaussian-state Quantum illumination using direct photon measurement
Su-Yong Lee, Dong Hwan Kim, Yonggi Jo +3
It is important to find feasible measurement bounds for quantum information protocols. We present analytic bounds for quantum illumination with Gaussian states when using an on-off…
Correlations and energy in mediated dynamics
Tanjung Krisnanda, Su-Yong Lee, Changsuk Noh +4
The minimum time required for a quantum system to evolve to a distinguishable state is set by the quantum speed limit, and consequently influences the change of quantum correlation…
Squeezing Limit of the Josephson Ring Modulator as a Non-Degenerate Parametric Amplifier
Dong Hwan Kim, Su-Yong Lee, Zaeill Kim +2
Two-mode squeezed vacuum states are a crucial component of quantum technologies. In the microwave domain, they can be produced by Josephson ring modulator which acts as a three-wav…
Noise-robust single-pixel imaging in photon counting regime with a pulsed source
Junghyun Kim, Sangkyung Lee, Yonggi Jo +6
We present a method to classically enhance noise-robustness of single-pixel imaging in photon counting regime with a pulsed source. By using time-domain cross-correlations between…
Heralded single-pixel imaging with high loss-resistance and noise-robustness
Junghyun Kim, Taek Jeong, Su-Yong Lee +6
Imaging with non-classically correlated photon-pairs takes advantages over classical limits in terms of sensitivity and signal-to-noise ratio. However, it is still a challenge to a…
Quantum illumination with non-Gaussian states: Bounds on the minimum error probability using quantum Fisher information
Changsuk Noh, Changhyoup Lee, Su-Yong Lee
Quantum illumination employs entangled states to detect a weakly reflective target in a thermal bath. The performance of a given entangled state is evaluated from the minimum error…
Observable bound for Gaussian illumination
Su-Yong Lee, Yonggi Jo, Taek Jeong +6
We propose observable bounds for Gaussian illumination to maximize the signal-to-noise ratio, which minimizes the discrimination error between the presence and absence of a low-ref…
Quantum illumination with asymmetrically squeezed two-mode light
Yonggi Jo, Taek Jeong, Junghyun Kim +4
We propose Gaussian quantum illumination(QI) protocol exploiting asymmetrically squeezed two-mode(ASTM) state that is generated by applying single-mode squeezing operations on each…
Surviving Entanglement in Optic-Microwave Conversion by Electro-Optomechanical System
Yonggi Jo, Su-Yong Lee, Yong Sup Ihn +3
In recent development of quantum technologies, a frequency conversion of quantum signals has been studied widely. We investigate the optic-microwave entanglement that is generated…
Coherent multi-mode conversion from microwave to optical wave via a magnon-cavity hybrid system
Yong Sup Ihn, Su-Yong Lee, Dongkyu Kim +2
Coherent conversion from microwave to optical wave opens new research avenues towards long distant quantum network covering quantum communication, computing, and sensing out of the…
Quantum illumination via quantum-enhanced sensing
Su-Yong Lee, Yong Sup Ihn, Zaeill Kim
Quantum-enhanced sensing has a goal of enhancing a parameter sensitivity with input quantum states, while quantum illumination has a goal of enhancing a target detection capability…
Optimal quantum phase estimation with generalized multi-component Schrodinger cat states
Seung-Woo Lee, Su-Yong Lee, Jaewan Kim
In this paper, we are interested in detecting the presence of a nearby phase-sensitive object, where traveling light works out under a low-photon loss rate. Here we investigate the…
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…
Optimal entangled coherent states in lossy quantum-enhanced metrology
Su-Yong Lee, Yong Sup Ihn, Zaeill Kim
We investigate an optimal distance of two components in an entangled coherent state for quantum phase estimation in lossy interferometry. The optimal distance is obtained by an eco…
Sculpting out quantum correlations with bosonic subtraction
Marcin Karczewski, Su-Yong Lee, Junghee Ryu +3
We present a method to extract M-partie bosonic correlations from an N-partite maximally symmetric state (M < N) with the help of successive applications of single-boson subtractio…
Optimal measurements for quantum fidelity between Gaussian states and its relevance to quantum metrology
Changhun Oh, Changhyoup Lee, Leonardo Banchi +3
Quantum fidelity is a measure to quantify the closeness of two quantum states. In an operational sense, it is defined as the minimal overlap between the probability distributions o…
On dynamical stability of composite quantum particles: when entanglement is enough and when interaction is needed
Zakarya Lasmar, Adam S. Sajna, Su-Yong Lee +1
We consider an evolution of two elementary quantum particles and ask the question: under what conditions such a system behaves as a single object? It is obvious that if the attract…
Optimal Gaussian measurements for phase estimation in single-mode Gaussian metrology
Changhun Oh, Changhyoup Lee, Carsten Rockstuhl +4
The central issue in quantum parameter estimation is to find out the optimal measurement setup that leads to the ultimate lower bound of an estimation error. We address here a ques…
Detecting non-decomposability of time evolution via extreme gain of correlations
Tanjung Krisnanda, Ray Ganardi, Su-Yong Lee +2
Non-commutativity is one of the most elementary non-classical features of quantum observables. Here we propose a method to detect non-commutativity of interaction Hamiltonians of t…
Two-particle indistinguishability and identification of boson-and-fermion species: a Fisher information approach
Su-Yong Lee, Jeongho Bang, Jaewan Kim
We present a study on two-particle indistinguishability and particle-species identification by introducing a Fisher-information (FI) approach---in which two particles pass through…
Practical resources and measurements for lossy optical quantum metrology
Changhun Oh, Su-Yong Lee, Hyunchul Nha +1
We study the sensitivity of phase estimation in a lossy Mach-Zehnder interferometer (MZI) using two general, and practical, resources generated by a laser and a nonlinear optical m…
Quantum noise reduction in intensity-sensitive surface plasmon resonance sensors
Joong-Sung Lee, Trung Huynh, Su-Yong Lee +5
We investigate the use of twin-mode quantum states of light with symmetric statistical features in their photon number for improving intensity-sensitive surface plasmon resonance (…
Single-photon quantum nonlocality: Violation of the Clauser-Horne-Shimony-Holt inequality using feasible measurement setups
Su-Yong Lee, Jiyong Park, Jaewan Kim +1
We investigate quantum nonlocality of a single-photon entangled state under feasible measurement techniques consisting of on-off and homodyne detections along with unitary operatio…