28 citations · 160 across the 21 of their papers we have counts for
23 papers
Field demonstration of a self-contained 10 km mobile-to-ground quantum network node via common-aperture co-propagation
Dongkyu Kim, Dong-Gil Im, Kyungdeuk Park +4
In this work, we demonstrate a dual-function, common-aperture free-space optical system that simultaneously supports decoy-state BB84 quantum key distribution (QKD) at 803 nm and b…
Quantum key distribution over a 2 km free-space channel with a high secure key rate
Kyungdeuk Park, Dongkyu Kim, Dong-Gil Im +4
Free-space quantum key distribution (QKD) provides crucial advantages, including mobility and deployment exibility, for securing next-generation communication networks. However, at…
Maximal coherence of quantum measurement and the resource theory of sharpness
Kyunghyun Baek, Yonggi Jo, Hyunchul Nha
A resource theory of quantum measurement can be addressed in terms of quantum coherence and measurement sharpness, respectively. The former analyzes the off-diagonal structure of P…
Spectrally engineered collinear type-0 SPDC source with enhanced spectral brightness for entanglement distribution
Dong-Gil Im, Jungmo Lee, Kyungdeuk Park +3
Entangled photon sources with high spectral brightness are important resources for photonic quantum information processing, particularly in quantum communication and quantum networ…
Robust Generation of Topological Biphoton Mode via Adiabatic Passage
Jaesung Lim, Jihwan Kim, Dong-Gil Im +4
Topological waveguide arrays support robust mode propagation in the presence of fabrication imperfections, providing a significant advantage for on-chip quantum information process…
Time-spectral control of accidental coincidences in daylight entanglement-based free-space QKD
Jiyoung Moon, Yonggi Jo, Zaeill Kim +2
Daylight entanglement-based free-space quantum key distribution (QKD) is limited by accidental coincidences from receiver-admitted background light. We develop and experimentally v…
Recon?figurable measurement scheme compatible with MDI-QKD and BB84 protocols using single-laser sideband generation
Jaesung Lim, Yonggi Jo, Nam Hun Park +2
A quantum network can be operated efficiently by switching between measurement-device independent quantum key distribution (MDI-QKD) and BB84 according to the trust level of an int…
Quantum target ranging with Hetero-Homodyne detection
Sangwoo Jeon, Yonggi Jo, Jihwan Kim +4
Quantum target ranging, which estimates a target position using entangled photon pairs, is known to offer an error-probability advantage over classical ranging strategies. Yet, rea…
Optimizing brightness of SPDC source in Laguerre-Gaussian modes using type-0 periodically-poled nonlinear crystal
Jungmo Lee, Kyungdeuk Park, Dongkyu Kim +3
Photon pairs generated via spontaneous parametric down-conversion (SPDC) can exhibit entanglement in the Laguerre-Gaussian (LG) mode basis, which enables high-dimensional free-spac…
Single-shot detection limits of quantum illumination with multi-qudit states
Sunghwa Kang, Yonggi Jo, Jihwan Kim +3
Quantum illumination is a protocol for detecting a low-reflectivity target by using two-mode entangled states composed of signal and idler modes, which can outperform unentangled s…
True image construction in quantum-secured single-pixel imaging under spoofing attack
Jaesung Heo, Taek Jeong, Nam Hun Park +1
In this paper, we introduce a quantum-secured single-pixel imaging (QS-SPI) technique designed to withstand spoofing attacks, wherein adversaries attempt to deceive imaging systems…
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…
Quantum-secured single-pixel imaging with enhanced security
Jaesung Heo, Junghyun Kim, Taek Jeong +4
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 decei…
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…
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…
Quantum illumination receiver using double homodyne detection
Yonggi Jo, Sangkyung Lee, Yong Sup Ihn +2
A quantum receiver is an essential element of quantum illumination (QI) which outperforms its classical counterpart, called classical-illumination (CI). However, there are only few…
Efficient High-dimensional Quantum Key Distribution with Hybrid Encoding
Yonggi Jo, Hee Su Park, Seung-Woo Lee +1
We propose a schematic setup of quantum key distribution (QKD) with an improved secret key rate based on high-dimensional quantum states. Two degrees-of-freedom of a single photon,…
Enhanced Bell state measurement for efficient measurement-device-independent quantum key distribution using 3-dimensional quantum states
Yonggi Jo, Kwangil Bae, Wonmin Son
We propose an enhanced discrimination measurement for tripartite 3-dimensional entangled states in order to improve the discernible number of orthogonal entangled states. The schem…
Key rate enhancement using qutrit states for uncharacterized quantum key distribution
Yonggi Jo, Wonmin Son
It is known that measurement-device-independent quantum key distribution (MDI-QKD) provides ultimate security from all types of side-channel attack against detectors at the expense…