64 citations · 311 across the 23 of their papers we have counts for
23 papers
Violation of Bell inequality by four photon Greenberger Horne Zeilinger state with a phase from a warm atomic ensemble
Jiho Park, Junghee Ryu, Heonoh Kim +1
A Greenberger Horne Zeilinger (GHZ) entangled state with a phase is crucial for realizing desired multipartite quantum states for practical applications. Here, we report violations…
Two-photon interferences of weak coherent lights
Heonoh Kim, Osung Kwon, Han Seb Moon
Multiphoton interference is an important phenomenon in modern quantum mechanics and experimental quantum optics, and it is fundamental for the development of quantum information sc…
Time-resolved two-photon interference of weak coherent pulses
Heonoh Kim, Osung Kwon, Han Seb Moon
The observation of the Hong-Ou-Mandel (HOM)-type two-photon interference (TPI) has played an important role in the development of photonic quantum technologies. The time-resolved c…
Hong-Ou-Mandel interference of two independent continuous-wave coherent photons
Heonoh Kin, Danbi Kim, Jiho Park +1
Interference between two completely independent photons lies at the heart of many photonic quantum information applications such as quantum repeaters, teleportation, and quantum ke…
Four-Photon GHZ Entanglement via Collective Two-Photon Coherence in Doppler-Broadened Atoms
Jiho Park, Heonoh Kim, Han Seb Moon
Bright, entangled multiphoton sources based on atom photon interactions are an essential requirement in the realization of several quantum information and quantum computation schem…
Experimental interference of uncorrelated photons
Heonoh Kim, Osung Kwon, Han Seb Moon
The distinguishing of the multiphoton quantum interference effect from the classical one forms one of the most important issues in modern quantum mechanics and experimental quantum…
Pulsed Sagnac source of polarization-entangled photon pairs in telecommunication band
Heonoh Kim, Osung Kwon, Han Seb Moon
We report a source of polarization-entangled photon pairs in the 1550-nm telecommunication band, which is based on non-collinear spontaneous parametric down-conversion in a periodi…
CHSH inequality test via disturbance-free measurement
Sang Min Lee, Minsu Kim, Heonoh Kim +2
We propose disturbance-free measurement using a "weak-value" scheme, in which a weakly measured quantum system is post-selected (to the initial state) to confirm that there is no d…
Two-photon interference of polarization-entangled photons in a Franson interferometer
Heonoh Kim, Sang Min Lee, Osung Kwon +1
We present two-photon interference experiments with polarization-entangled photon pairs in a polarization-based Franson-type interferometer. Although the two photons do not meet at…
Observation of two-photon interference effect with single non-photon-number resolving detector
Heonoh Kim, Sang Min Lee, Osung Kwon +1
Multiphoton interference effects can be measured with a single detector when two input photons are temporally well separated when compared with the dead time of the single-photon a…
Quantum Interference between Autonomous Single-Photon Sources from Doppler-Broadened Atomic Ensemble
Teak Jeong, Yoon-Seok Lee, Jiho Park +2
To realize a quantum network based on quantum entanglement swapping, bright and completely autonomous sources are essentially required. Here, we experimentally demonstrate Hong-Ou-…
Highly bright photon-pair generation in Doppler-broadened ladder-type atomic system
Yoon-Seok Lee, Sang Min Lee, Heonoh Kim +1
We report a bright photon-pair source with a coincidence counting rate per input power (cps/mW) of tens of thousands, obtained via spontaneous four-wave mixing from a Doppler-broad…
Two-photon interference of temporally separated photons
Heonoh Kim, Sang Min Lee, Han Seb Moon
We present experimental demonstrations of two-photon interference involving temporally separated photons within two types of interferometers: a Mach-Zehnder interferometer and a po…
Superradiant Emission of Ultra-Bright Photon Pairs in Doppler-Broadened Atomic Ensemble
Yoon-Seok Lee, Sang Min Lee, Heonoh Kim +1
With a recent rising interest of single photon superradiance due to its potential usefulness for efficient collection of single photon from an atomic ensemble, bright and narrow ph…
Simultaneous measurement of HOM-like and N00N-like two-photon wavepackets in a Mach-Zehnder interferometer
Heonoh Kim, Sang Min Lee, Han Seb Moon
We propose and experimentally demonstrate two-photon interference effects in a Mach-Zehnder interferometer in which two different kinds of two-photon states are prepared by introdu…
Polarization-entangled photon-pair source obtained via type-II non-collinear SPDC process with PPKTP crystal
Sang Min Lee, Heonoh Kim, Myoungsik Cha +1
We demonstrate a polarization-entangled photon-pair source obtained via a type-II non-collinear quasi-phase-matched spontaneous parametric down-conversion process with a 10-mm peri…
Highly efficient source for frequency-entangled photon pairs generated in a 3rd order periodically poled MgO-doped stoichiometric LiTaO3 crystal
Heonoh Kim, Hee Jung Lee, Sang Min Lee +1
We present a highly efficient source for discrete frequency-entangled photon pairs based on spontaneous parametric down-conversion using 3rd order type-0 quasi-phase matching in a…
Generalized quantum interference of correlated photon pairs
Heonoh Kim, Sang Min Lee, Han Seb Moon
Superposition and indistinguishablility between probability amplitudes have played an essential role in observing quantum interference effects of correlated photons. The Hong-Ou-Ma…
Equal-fidelity surface for a qubit state via equal-distance extended Bloch vectors and derivatives
Sang Min Lee, Heonoh Kim, Han Seb Moon
We describe and characterize an equal-fidelity surface in Bloch space targeted for a qubit state by means of equal-distance concept. The distance is generalized and defined as the…
Experimental demonstration of error-insensitive approximate universal-NOT gates
Sang Min Lee, Jeongho Bang, Heonoh Kim +3
We propose and experimentally demonstrate an approximate universal-NOT (U-NOT) operation that is robust against operational errors. In our proposal, the U-NOT operation is composed…
Experimental Realization of a Four-Photon Seven-Qubit Graph State for One-Way Quantum Computation
Sang Min Lee, Hee Su Park, Jaeyoon Cho +5
We propose and demonstrate the scaling up of photonic graph state through path qubit fusion. Two path qubits from separate two-photon four-qubit states are fused to generate a two-…
Observation of Young's Double-Slit Interference with the Three-Photon N00N State
Yong-Su Kim, Osung Kwon, Sang Min Lee +4
Spatial interference of quantum mechanical particles exhibits a fundamental feature of quantum mechanics. A two-mode entangled state of N particles known as N00N state can give ris…
Heralded Generation of High-Visibility Three-Photon NOON States
Heonoh Kim, Hee Su Park, Sang-Kyung Choi
We describe an experimental demonstration of a novel three-photon NOON state generator using a single source of photons based on spontaneous parametric down-conversion (SPDC). The…