Yong Sup Ihn
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View article: Security analysis of qutrit quantum secret sharing with linear optical correlation measurement
Security analysis of qutrit quantum secret sharing with linear optical correlation measurement Open
In this paper, we investigate a possibility of three-dimensional extension of correlation measurement based quantum secret sharing (QSS) with a three-dimensional cyclic-entangled state, called qutrit cyclic-entangled state. The qutrit cycl…
View article: Ultrabright Fiber‐Coupled Polarization‐Entangled Photon Source with Spectral Brightness Surpassing 2.0 MHz mW<sup>−1</sup> nm<sup>−1</sup>
Ultrabright Fiber‐Coupled Polarization‐Entangled Photon Source with Spectral Brightness Surpassing 2.0 MHz mW<sup>−1</sup> nm<sup>−1</sup> Open
This study presents an ultrabright polarization‐entangled photon source that is optimally coupled into single‐mode fibers (SMFs). This study theoretically and experimentally examines the characteristics of spontaneous parametric down‐conve…
View article: Ultrabright fiber-coupled ploarization-entangled photon source with spectral brightness surpassing 2.0 MHz/mW/nm
Ultrabright fiber-coupled ploarization-entangled photon source with spectral brightness surpassing 2.0 MHz/mW/nm Open
We present an ultrabright polarization-entangled photon source that is optimally coupled into single-mode fibers (SMFs). This study theoretically and experimentally examines the characteristics of spontaneous parametric down-conversion (SP…
View article: Highly-enhanced active beam-wander-correction for free-space quantum communications
Highly-enhanced active beam-wander-correction for free-space quantum communications Open
In practical applications to free-space quantum communications, the utilization of active beam coupling and stabilization techniques offers notable advantages, particularly when dealing with limited detecting areas or coupling into single-…
View article: Highly-enhanced active beam-wander-correction for free-space quantum communications
Highly-enhanced active beam-wander-correction for free-space quantum communications Open
In practical applications to free-space quantum communications, the utilization of active beam coupling and stabilization techniques offers notable advantages, particularly when dealing with limited detecting areas or coupling into single-…
View article: Quantum-secured single-pixel imaging with enhanced security
Quantum-secured single-pixel imaging with enhanced security Open
In this paper, we propose a quantum-secured single-pixel imaging method that utilizes non-classical correlations of a photon pair. Our method can detect any attempts to deceive it by exploiting a non-classical correlation of photon pairs w…
View article: Quantum-secured single-pixel imaging with enhanced security
Quantum-secured single-pixel imaging with enhanced security Open
In this paper, we propose a novel quantum-secured single-pixel imaging method that utilizes non-classical correlations of a photon pair. Our method can detect any attempts to deceive it by exploiting a non-classical correlation of photon p…
View article: Lossy and noisy channel simulation in computational ghost imaging by using noise-induced pattern
Lossy and noisy channel simulation in computational ghost imaging by using noise-induced pattern Open
View article: Quantum-correlation-based free-space optical link with an active reflector
Quantum-correlation-based free-space optical link with an active reflector Open
We present a quantum-correlation-based free-space optical(FSO) link over 250\nm using an outdoor active reflector 125 m from the transceiver station. The\nperformance of free-space optical communication can be significantly degraded\nby at…
View article: Trapping a free-propagating single-photon into an atomic ensemble as a quantum stationary light pulse
Trapping a free-propagating single-photon into an atomic ensemble as a quantum stationary light pulse Open
Efficient photon–photon interaction is one of the key elements for realizing quantum information processing. The interaction, however, must often be mediated through an atomic medium due to the bosonic nature of photons, and the interactio…
View article: Observable bound for Gaussian illumination
Observable bound for Gaussian illumination Open
We propose observable bounds for Gaussian illumination to maximize the\nsignal-to-noise ratio, which minimizes the discrimination error between the\npresence and absence of a low-reflectivity target using Gaussian states. The\nobservable b…
View article: Noise-robust single-pixel imaging in the photon counting regime with a pulsed source
Noise-robust single-pixel imaging in the photon counting regime with a pulsed source Open
We present a method to classically enhance the noise robustness of single-pixel imaging in the photon counting regime with a pulsed source. By using time-domain cross correlations between temporal profiles of a pulsed source and received s…
View article: Noise-robust single-pixel imaging in photon counting regime with a pulsed source
Noise-robust single-pixel imaging in photon counting regime with a pulsed source Open
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 temporal profiles of a pulsed source and received signals, …
View article: Heralded single-pixel imaging with high loss-resistance and noise-robustness
Heralded single-pixel imaging with high loss-resistance and noise-robustness Open
Imaging with non-classically correlated photon-pairs takes advantages over classical limits in terms of sensitivity and a signal-to-noise ratio. However, it is still a challenge to achieve a strong resilience to background noise and losses…
View article: Optimal observables for Gaussian illumination
Optimal observables for Gaussian illumination Open
We propose optimal observables for Gaussian illumination to maximize the signal-to-noise ratio, which minimizes the discrimination error between the presence and absence of a low-reflectivity target using Gaussian states. The optimal obser…
View article: Quantum illumination with asymmetrically squeezed two-mode light
Quantum illumination with asymmetrically squeezed two-mode light Open
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 mode of an initial two-mode squeezed vacuum(TMSV) state, i…
View article: Quantum illumination via quantum-enhanced sensing
Quantum illumination via quantum-enhanced sensing Open
Quantum-enhanced sensing has a goal of enhancing a parameter sensitivity with\ninput quantum states, while quantum illumination has a goal of enhancing a\ntarget detection capability with input entangled states in a heavy noise\nenvironmen…
View article: Coherent multi-mode conversion from microwave to optical wave via a magnon-cavity hybrid system
Coherent multi-mode conversion from microwave to optical wave via a magnon-cavity hybrid system Open
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 laboratory. Especially multi-mode enabled system is essent…
View article: Optimal entangled coherent states in lossy quantum-enhanced metrology
Optimal entangled coherent states in lossy quantum-enhanced metrology Open
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 economical point, representing the quantum Fisher information …
View article: Optical Wave Guiding and Spectral Properties of Micro/Nanofibers Used for Quantum Sensing and Quantum Light Generation
Optical Wave Guiding and Spectral Properties of Micro/Nanofibers Used for Quantum Sensing and Quantum Light Generation Open
Subwavelength optical micro/nanofibers have been widely used as basic building blocks in the field of quantum sensing and quantum light source by virtue of their properties which include pronounced evanescent field, large surface area, and…
View article: Observation of photon-pair generation in the normal group-velocity-dispersion regime with slight detuning from the pump wavelength
Observation of photon-pair generation in the normal group-velocity-dispersion regime with slight detuning from the pump wavelength Open
A fiber-based photon-pair source in the telecom C-band is suitable for quantum information science including quantum communications. Spontaneous four-wave mixing effects are known to create photon pairs that are slightly detuned from the p…
View article: Second-Order Temporal Interference with Thermal Light: Interference beyond the Coherence Time
Second-Order Temporal Interference with Thermal Light: Interference beyond the Coherence Time Open
We report the observation of a counterintuitive phenomenon in multipath correlation interferometry with thermal light. The intensity correlation between the outputs of two unbalanced Mach-Zehnder interferometers (UMZIs) with two classicall…