90 citations · 772 across the 49 of their papers we have counts for
49 papers
Demonstration of subspace-search variational quantum eigensolver using photonic orbital angular momentum qudits
Kang-Min Hu, Myung-Hyun Sohn, Yong-Su Kim +3
Accurate excited state energies are essential for interpreting fluorescence and photochemical processes, yet variational quantum eigensolvers (VQEs) on noisy intermediate-scale qua…
Universal quantum cloning beyond noncontextual theory
Min Namkung, Hyang-Tag Lim
Quantum theory fundamentally forbids the perfect copying of an arbitrary unknown quantum state, according to a principle known as the no-cloning theorem. Nevertheless, it is possib…
Multipartite reference-frame-independent quantum cryptographic communication
Donghwa Lee, Kyujin Shin, Hyang-Tag Lim +2
Reference frame mismatch among communication parties introduces errors in quantum cryptographic protocols. As the number of participants increases, aligning reference frames become…
Contextuality of quantum non-demolition measurement via state discrimination
Min Namkung, Ilhwan Kim, Hyang-Tag Lim
Quantum non-demolition measurements facilitate various quantum technologies, including quantum communication. Notably, their operational structure can be replicated by a classical…
Experimental demonstration of optimal measurement for unambiguously discriminating asymmetric qudit states
Kang-Min Hu, Min Namkung, Myung-Hyun Sohn +1
Identification of nonorthogonal quantum states without error is crucial for various applications in quantum information technology, as well as the foundations of quantum physics. T…
Entanglement recovery by reversing the effect of noise in quantum repeater
Sewon Jeong, Shrobona Bagchi, Jaehak Lee +4
We propose a method to directly recover the degree of entanglement distributed by entanglement swapping in the presence of noise. Our approach introduces a reversing operation that…
Contextuality-enhanced quantum state discrimination under fixed failure probability
Min Namkung, Hyang-Tag Lim
Quantum state discrimination enables the accurate identification of quantum states, which are generally nonorthogonal. Among various strategies, minimum-error discrimination and un…
Universal Operational Privacy in Distributed Quantum Sensing
Min Namkung, Dong-Hyun Kim, Seongjin Hong +3
Privacy is a fundamental requirement in distributed quantum sensor networks, where multiple clients estimate spatially distributed parameters using shared quantum resources while i…
Photonic variational quantum eigensolver for NISQ-compatible quantum technology
Kang-Min Hu, Min Namkung, Hyang-Tag Lim
Quantum computers have the potential to deliver speed-ups for solving certain important problems that are intractable for classical counterparts, making them a promising avenue for…
Distributed quantum sensing with multi-mode states
Dong-Hyun Kim, Seongjin Hong, Yong-Su Kim +4
Distributed quantum sensing, which estimates a global parameter across distant nodes, has attracted significant interest for applications such as quantum imaging, sensor networks,…
Unified strategy for non-invertible Fisher information matrix in quantum metrology
Min Namkung, Changhyoup Lee, Hyang-Tag Lim
In quantum multi-parameter estimation, the precision of estimating unknown parameters is bounded by the Cramer-Rao bound (CRB), defined via the inverse of the Fisher information ma…
Robust and bright polarization-entangled photon sources exploiting non-critical phase matching without periodic poling
Ilhwan Kim, Yosep Kim, Yong-Su Kim +2
Entangled photon sources are essential for quantum information applications, including quantum computation, quantum communication, and quantum metrology. Periodically poled (PP) cr…
Distributed quantum machine learning via classical communication
Kiwmann Hwang, Hyang-Tag Lim, Yong-Su Kim +2
Quantum machine learning is emerging as a promising application of quantum computing due to its distinct way of encoding and processing data. It is believed that large-scale quantu…
Persistent quantum advantage with definite photon-number states in lossy multiple-phase estimation
Min Namkung, Dong-Hyun Kim, Seongjin Hong +2
Multiple-phase estimation exploiting quantum states has broad applications in novel sensing and imaging technologies. However, the unavoidable presence of lossy environments in pra…
Implementation of CU gates and its application in a remote-controlled quantum operation
Byungjoo Kim, Seongjin Hong, Yong-Su Kim +2
Recently, remote-controlled quantum information processing has been proposed for its applications in secure quantum processing protocols and distributed quantum networks. For remot…
Entanglement swapping via lossy channels using photon-number-encoded states
Wan Zo, Bohdan Bilash, Donghwa Lee +5
Entanglement shared between distant parties is a key resource in quantum networks. However, photon losses in quantum channels significantly reduce the success probability of entang…
Photonic variational quantum eigensolver using entanglement measurements
Jinil Lee, Wooyeong Song, Donghwa Lee +6
Variational quantum eigensolver (VQE), which combines quantum systems with classical computational power, has been arisen as a promising candidate for near-term quantum computing a…
Optimal multiple-phase estimation with multi-mode NOON states against photon loss
Min Namkung, Dong-Hyun Kim, Seongjin Hong +3
Multi-mode NOON states can quantum-enhance multiple-phase estimation in the absence of photon loss. However, a multi-mode NOON state is known to be vulnerable to photon loss, and i…
Nondestructive discrimination of Bell states between distant parties
Bohdan Bilash, Youngrong Lim, Hyukjoon Kwon +4
Identifying Bell states without destroying it is frequently dealt with in nowadays quantum technologies such as quantum communication and quantum computing. In practice, quantum en…
Aluminum nitride waveguide beam splitters for integrated quantum photonic circuits
Hyeong-Soon Jang, Donghwa Lee, Hyungjun Heo +7
We demonstrate integrated photonic circuits for quantum devices using sputtered polycrystalline aluminum nitride (AlN) on insulator. The on-chip AlN waveguide directional couplers,…
Sub-10 nm precision engineering of solid-state defects via nanoscale aperture array mask
Tae-yeon Hwang, Junghyun Lee, Seong-Woo Jeon +7
Engineering a strongly interacting uniform qubit cluster would be a major step towards realizing a scalable quantum system for quantum sensing, and a node-based qubit register. For…
Error-mitigated photonic variational quantum eigensolver using a single-photon ququart
Donghwa Lee, Jinil Lee, Seongjin Hong +6
We report the experimental resource-efficient implementation of the variational quantum eigensolver (VQE) using four-dimensional photonic quantum states of single-photons. The four…
Implementation of a 3 x 3 directionally-unbiased linear optical multiport
Ilhwan Kim, Donghwa Lee, Seongjin Hong +4
Linear optical multiports are widely used in photonic quantum information processing. Naturally, these devices are directionally-biased since photons always propagate from the inpu…
Global triplewise information trade-off in quantum measurement
Seongjin Hong, Yong-Su Kim, Young-Wook Cho +3
State disturbance by a quantum measurement is at the core of foundational quantum physics and constitutes a fundamental basis of secure quantum information processing. While quanti…