111 citations · 272 across the 19 of their papers we have counts for
20 papers
Quantum Radar Cross Section with two-photon entangled states
Sunghwa Kang, Jihwan Kim, Zaeill Kim +7
We study two-photon entangled states for quantum radar cross section (QRCS), which is an extension of a single-photon QRCS formula. Since signal-idler entanglement does not provide…
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…
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…
Microwave Quantum Illumination with Optical Memory and Single-Mode Phase-Conjugate Receiver
Sangwoo Jeon, Jihwan Kim, Duk Y. Kim +3
Microwave quantum illumination with entangled pairs of microwave signal and optical idler modes, can achieve the sub-optimal performance with joint measurement of the signal and id…
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…
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…
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…
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 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…
An atomic interface between microwave and optical photons
M. Hafezi, Z. Kim, S. L. Rolston +3
A complete physical approach to quantum information requires a robust interface among flying qubits, long-lifetime memory and computational qubits. Here we present a unified interf…