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Your search keyword '"Erotokritou, Kleanthis' showing total 6 results
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6 results on '"Erotokritou, Kleanthis'

1. Generation and characterization of two-photon entanglement in the mid infrared

Author

Dmitry Morozov, Taylor Shields, Masahiro Yabuno, Corin B. E. Gawith, Hirotaka Terai, Shashi Prabhakar, Gregor G. Taylor, Shigehito Miki, Michael Kues, Robert H. Hadfield, Matteo Clerici, Mehdi Ebrahim, Lucia Caspani, Kleanthis Erotokritou, and Adetunmise C. Dada

Subjects
Physics, Quantum technology, Quantum optics, Optics, Spontaneous parametric down-conversion, business.industry, Nonlinear optics, Astrophysics::Earth and Planetary Astrophysics, Quantum entanglement, Photonics, business, Quantum information science, Interference (wave propagation)
Abstract

We demonstrate two-photon interference and polarization entanglement at 2090 nm, constituting a crucial leap towards free-space mid-infrared quantum communication systems in a spectral region with high atmospheric transparency and reduced solar background.

Published
2021

2. Two-photon quantum interference and entanglement at 2.1 μm

Author

Lucia Caspani, Masahiro Yabuno, Matteo Clerici, Michael Kues, Robert H. Hadfield, Dmitry Morozov, Shashi Prabhakar, Kleanthis Erotokritou, Adetunmise C. Dada, Mehdi Ebrahim, Taylor Shields, Shigehito Miki, Corin B. E. Gawith, Gregor G. Taylor, and Hirotaka Terai

Subjects
Photon, Lithium niobate, Nanowire, Physics::Optics, Quantum entanglement, Quantum key distribution, 01 natural sciences, 010309 optics, chemistry.chemical_compound, Photon entanglement, Interference (communication), 0103 physical sciences, 010306 general physics, Research Articles, QC, Computer Science::Cryptography and Security, Physics, Multidisciplinary, business.industry, SciAdv r-articles, Optics, Quantum technology, chemistry, Optoelectronics, business, Research Article
Abstract

Our results show a viable route to free-space quantum-secured communication in an unexplored atmospheric transparency window., Quantum-enhanced optical systems operating within the 2- to 2.5-μm spectral region have the potential to revolutionize emerging applications in communications, sensing, and metrology. However, to date, sources of entangled photons have been realized mainly in the near-infrared 700- to 1550-nm spectral window. Here, using custom-designed lithium niobate crystals for spontaneous parametric down-conversion and tailored superconducting nanowire single-photon detectors, we demonstrate two-photon interference and polarization-entangled photon pairs at 2090 nm. These results open the 2- to 2.5-μm mid-infrared window for the development of optical quantum technologies such as quantum key distribution in next-generation mid-infrared fiber communication systems and future Earth-to-satellite communications.

Published
2020

3. 2.3μm wavelength single photon LIDAR with superconducting nanowire detectors

Author

Kleanthis Erotokritou, Dmitry Morozov, Nathan R. Gemmell, Gregor G. Taylor, and Robert H. Hadfield

Subjects
Superconductivity, Wavelength, Optics, Materials science, Lidar, Photon, business.industry, Detector, Nanowire, Physics::Optics, Superconducting nanowire single-photon detector, business, Photon counting
Abstract

A superconducting nanowire single photon detector system designed for 2.3µm wavelength deployed into a single photon light detection and ranging setup. This wavelength takes advantage of lower solar flux and less atmospheric absorption.

Published
2019

4. Enhanced optics for time-resolved singlet oxygen luminescence detection

Author

Robert H. Hadfield, Taro Yamashita, Masahiro Yabuno, Nathan R. Gemmell, Konstantinos Tsimvrakidis, Shigehito Miki, Hirotaka Terai, and Kleanthis Erotokritou

Subjects
Materials science, business.industry, Singlet oxygen, 02 engineering and technology, Atomic and Molecular Physics, and Optics, Photon counting, 3. Good health, Supercontinuum, QC0350, chemistry.chemical_compound, 020210 optoelectronics & photonics, Optics, chemistry, 0202 electrical engineering, electronic engineering, information engineering, Dosimetry, Photosensitizer, Electrical and Electronic Engineering, Photonics, business, Optical filter, Luminescence
Abstract

Singlet oxygen luminescence dosimetry (SOLD) is a highly promising direct monitoring method for photodynamic therapy (PDT) in the treatment of cancer. Early SOLD systems have been hampered by inefficient excitation, poor optical collection and immature infrared single photon detection technology. We report carefully engineered improvements addressing all of these deficiencies. We use a supercontinuum source with a tunable filter to precisely target the peak absorption wavelength of the chosen photosensitizer; we have designed a compact and versatile optical package for precise alignment; we have successfully employed state-of-the-art superconducting photon counting technologies. Through these improvements, we can achieve real-time histogram acquisition from a photosensitizer in solution test sample. This setup opens the pathway to physiological SOLD studies for PDT dosimetry.

Published
2019

5. Photon counting LIDAR at 23µm wavelength with superconducting nanowires

Author

Hirotaka Terai, Gregor G. Taylor, Nathan R. Gemmell, Shigehito Miki, Kleanthis Erotokritou, Robert H. Hadfield, and Dmitry Morozov

Subjects
Superconductivity, Materials science, business.industry, Detector, Nanowire, Physics::Optics, Ranging, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, Photon counting, 010309 optics, Wavelength, Lidar, Optics, 0103 physical sciences, Optical parametric oscillator, 0210 nano-technology, business
Abstract

In this work, we show a proof-of-principle benchtop single-photon light detection and ranging (LIDAR) depth imager at 2.3µm, utilizing superconducting nanowire single-photon detectors (SNSPDs). We fabricate and fiber-couple SNSPDs to exhibit enhanced photon counting performance in the mid-infrared. We present characterization results using an optical parametric oscillator source and deploy these detectors in a scanning LIDAR setup at 2.3µm wavelength. This demonstrates the viability of these detectors for future free-space photon counting applications in the mid-infrared where atmospheric absorption and background solar flux are low.

Published
2019

6. Mid-infrared quantum interference and polarization entanglement

Author

Kleanthis Erotokritou, Adetunmise C. Dada, Lucia Caspani, Hirotaka Terai, Robert H. Hadfield, Mehdi Ebrahim, Shashi Prabhakar, Michael Kues, Masahiro Yabuno, Taylor Shields, Gregor G. Taylor, Matteo Clerici, Shigehito Miki, Dmitry Morozov, and Corin B. E. Gawith

Subjects
Physics, Quantum optics, Optics, business.industry, Quantum interference, Photon polarization, Astrophysics::Earth and Planetary Astrophysics, Quantum entanglement, Quantum channel, Polarization (waves), Interference (wave propagation), business, Quantum information science
Abstract

We demonstrate two-photon interference and polarization entanglement at 2090 nm, constituting a crucial leap towards free-space mid-infrared quantum communication systems in a spectral region with high atmospheric transparency and reduced solar background.

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