Review
Nanoscience & Nanotechnology
Ying Yu, Shunfa Liu, Chang-Min Lee, Peter Michler, Stephan Reitzenstein, Kartik Srinivasan, Edo Waks, Jin Liu
Summary: This review article presents the physics and technological developments of epitaxial quantum dot devices emitting in the telecom bands for quantum network devices. The challenges and opportunities for future telecom quantum dot devices with improved performance and expanded functionality through hybrid integration are also discussed.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
F. Hassani, M. Peruzzo, L. N. Kapoor, A. Trioni, M. Zemlicka, J. M. Fink
Summary: Currently available quantum processors are limited by noise, but the introduction of the inductively shunted transmon offers a solution by providing protection against flux noise and a longer coherence time. The device also reveals quantum tunneling between prepared fluxon states with a long average decay time of up to 3.5 hours.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Jin-Woo Chae, Jin-Hun Kim, Youn-Chang Jeong, Yoon-Ho Kim
Summary: In this work, a tunable up-conversion single-photon detector module that covers the complete telecom C band is reported, making it suitable for quantum communication networks based on sharing wavelength-multiplexed entangled photons.
Article
Optics
Kazunori Shibata
Summary: Research indicates that the quantum nature of vacuum affects electromagnetic fields, resulting in nonlinear Maxwell's equations. By extending the finite-difference time-domain (FDTD) method with quartic nonlinear electromagnetic Lagrangian, the nonlinear Maxwell's equations can be numerically solved without assumptions on the electromagnetic field. Examples of self-modulations of nonlinear electromagnetic waves in a one-dimensional cavity show that even a small nonlinear correction can accumulate to achieve significant self-modulation over a long timescale, regardless of the strength of the electromagnetic field.
Article
Multidisciplinary Sciences
Lukasz Dusanowski, Cornelius Nawrath, Simone L. Portalupi, Michael Jetter, Tobias Huber, Sebastian Klembt, Peter Michler, Sven Hoefling
Summary: This study demonstrates a solid-state spin-qubit platform based on a hole confined in a semiconductor quantum dot that emits telecom-band photons. The researchers showcase the control and manipulation of the hole, enabling its use in long-distance quantum communication. This work is significant for the development of solid-state quantum emitters compatible with existing optical fiber networks.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jin Yang, Jun Chen Ke, Wen Kang Cao, Ming Zheng Chen, Qiang Cheng, Vincenzo Galdi, Tie Jun Cui
Summary: A time-division-multiplexing metasurface is proposed to achieve simultaneous conversion of polarization and frequency, utilizing time-modulated polarization switches to rotate polarization at the central frequency and synthesize various polarization states at selected harmonic frequencies. The theoretical predictions were validated through measurements on a prototype operating at microwave frequencies, marking the first experimental evidence of simultaneous polarization and frequency conversions via this approach. This innovation opens up a new avenue for controlling electromagnetic waves through time-varying metasurfaces, with potential applications ranging from polarization imaging to quantum optics.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Physics, Multidisciplinary
Hai-Long Liu, Min-Jie Wang, Jia-Xin Bao, Chao Liu, Ya Li, Shu-Jing Li, Hai Wang
Summary: This study constructed a passively stable single-photon interferometer using beam displacers to stabilize the relative phase between the two arms. The polarization fidelity achieved by the interferometer is about 99.1%.
Article
Physics, Multidisciplinary
Xu-Jie Wang, Sheng-Jun Yang, Peng-Fei Sun, Bo Jing, Jun Li, Ming-Ti Zhou, Xiao-Hui Bao, Jian-Wei Pan
Summary: Researchers achieved high-efficiency and long-lifetime entanglement between an atomic ensemble and a single photon through dual control modes and a three-dimensional optical lattice, and successfully verified the entanglement by testing the Bell inequality after 1 second of storage.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
M. R. Abbasi
Summary: This article explores the dynamics of entanglement between two different two-level atoms via monochromatic coherent photons, introducing a conserved operator to decompose the matrix representation of the total atom-photon Hamiltonian. The results show that robust entanglement is observed with initial maximally atomic entangled states, and entanglement enhances as Kerr-type coupling increases. The effects of initial atomic state preparation, atom-photon structure parameters, and field intensity on entanglement birth and death are also discussed.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Shen-Yun Wang, Jie-Dong Bi, Wei Liu, Wen Geyi, Steven Gao
Summary: A transmission-type cross-polarization converter based on a frequency selective surface (FSS) has been designed and investigated both theoretically and experimentally. The converter exhibits a wide transmission bandwidth and low insertion loss, with the ability to convert incident linear polarization to cross-polarization. Experimental results confirm the effectiveness of the proposed concept.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Optics
Zhi-Cheng Ren, Yan-Chao Lou, Zi-Mo Cheng, Li Fan, Jianping Ding, Xi-Lin Wang, Hui-Tian Wang
Summary: The experimental demonstration showcases a method of maintaining polarization and orbital angular momentum through frequency conversion in a nonlinear interferometer, offering a new possibility for building different wave band interfaces in more degrees of freedom.
Article
Physics, Applied
Jinghong Wu, Xin Wang, Hui Xiao, Yuxin Wang, Zhenteng Fan, Huaiqing Zhang
Summary: In this paper, a wide-incidence-angle insensitive reflective metasurface multi-polarization converter is proposed, which utilizes split-ring resonators and cross oscillators structure. The simulated results demonstrate that the polarization conversion ratio for linear to linear (LTL) polarization conversion is above 90% in three frequency bands, and the axial ratio for linear to circular (LTC) polarization conversion is below 3 dB in four frequency bands. The polarization conversion is not affected by the incidence angle when tilted by 45° in both transverse electric and transverse magnetic modes. A fabricated sample consisting of 18 x 18 unit cells is measured to verify the polarization conversion performance.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Optics
Filip Sosnicki, Michal Mikolajczyk, Ali Golestani, Michal Karpinski
Summary: A Fresnel time lens is developed to bridge the gap between ultrafast and slow quantum information processing systems. It compresses the single-photon spectral bandwidth from picosecond to nanosecond timescales. This development enables the integration of different quantum information processing platforms and facilitates large-scale hybrid quantum information processing.
Article
Physics, Applied
Ko Ito, Takeshi Kondo, Kyoko Mannami, Kazuya Niizeki, Daisuke Yoshida, Kohei Minaguchi, Mingyang Zheng, Xiuping Xie, Feng-Lei Hong, Tomoyuki Horikiri
Summary: The ability to transmit quantum states over long distances is crucial for the quantum internet, and quantum repeaters play a key role in achieving this. However, there is limited research on multiplexed photon sources and their coupling with multiplexed quantum memories. In this study, we demonstrate the storage of a frequency-multiplexed two-photon source in a quantum memory via wavelength conversion after a 10-km distribution. The developed system, which includes a frequency-stabilization system and a noise-reduction system, operates stably for more than 42 hours and can be applied to various physical systems requiring long-term system stability in quantum repeater systems.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Wei-Hang Zhang, Ying-Hao Ye, Lei Zeng, Ming-Xin Dong, En-Ze LI, Jing-Yuan Peng, Yan LI, Dong-Sheng Ding, Bao-Sen Shi
Summary: In this experiment, the frequency down-conversion through the four-wave mixing process in a cold 85Rb atomic ensemble was investigated. The results showed that the frequency-conversion efficiency can reach up to 32% with an improvement in the optical depth. It was also found that the efficiency may exceed 32% when the signal-to-noise ratio of the detected telecom field is higher than 10 and the mean signal count is larger than 0.2. This work can be combined with quantum memories based on cold 85Rb ensemble to serve for long-distance quantum networks.
Article
Engineering, Electrical & Electronic
Takashi Yamamoto
IEICE TRANSACTIONS ON ELECTRONICS
(2019)
Article
Multidisciplinary Sciences
Yasushi Hasegawa, Rikizo Ikuta, Nobuyuki Matsuda, Kiyoshi Tamaki, Hoi-Kwong Lo, Takashi Yamamoto, Koji Azuma, Nobuyuki Imoto
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
Tetsuya Mukai
SCIENTIFIC REPORTS
(2019)
Article
Physics, Multidisciplinary
Rikizo Ikuta, Ryoya Tani, Masahiro Ishizaki, Shigehito Miki, Masahiro Yabuno, Hirotaka Terai, Nobuyuki Imoto, Takashi Yamamoto
PHYSICAL REVIEW LETTERS
(2019)
Article
Quantum Science & Technology
Koichiro Miyanishi, Yoshiaki Tsujimoto, Rikizo Ikuta, Shigehito Miki, Masahiro Yabuno, Taro Yamashita, Hirotaka Terai, Takashi Yamamoto, Masato Koashi, Nobuyuki Imoto
NPJ QUANTUM INFORMATION
(2020)
Article
Physics, Applied
Rikizo Ikuta, Masayo Yokota, Toshiki Kobayashi, Nobuyuki Imoto, Takashi Yamamoto
Summary: This paper presents a concept of optical frequency tweezers, which enables high-resolution manipulation of light in the optical frequency domain. It is a frequency version of optical tweezers used for spatial manipulation of microscopic objects. The proof-of-principle experiment demonstrates the feasibility of the concept by performing frequency conversion only for the converted light. The experiment successfully achieves tweezing operation in the frequency domain by selecting light at a target frequency from the frequency multiplexed input light and converting it to a different frequency, without affecting other light at different frequency positions or altering the frequency by the pump light.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Rintaro Fujimoto, Tomohiro Yamazaki, Toshiki Kobayashi, Shigehito Miki, Fumihiro China, Hirotaka Terai, Rikizo Ikuta, Takashi Yamamoto
Summary: We demonstrate the distribution of frequency-multiplexed polarization-entangled photon pairs over 16 frequency channels. By using demultiplexers and a broadband spontaneous parametric down-conversion process, we successfully separate photons with narrow linewidths and minimize channel cross-talk. The observed fidelities of the photon pairs vary across the different channels. This study highlights the usefulness of polarization-entangled biphoton frequency combs for frequency-multiplexed entanglement distribution via a DWDM system.
Article
Physics, Applied
Yoshiaki Tsujimoto, Rikizo Ikuta, Kentaro Wakui, Toshiki Kobayashi, Mikio Fujiwara
Summary: We propose a method for quantum state tomography (QST) of an n-partite qudit state embedded in single photons based on Hong-Ou-Mandel interference. The method uses passive beam splitters in the target modes, transferring all active devices used in conventional QST methods to the probe preparation system. This allows for accurate estimation of the target state, even when the probe is prepared by a laser light with mode mismatch.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Tomohiro Yamazaki, Tomoaki Arizono, Toshiki Kobayashi, Rikizo Ikuta, Takashi Yamamoto
Summary: We propose a linear optical quantum computation scheme using time-frequency degrees of freedom. The scheme encodes a qubit in single-photon frequency combs and manipulates the qubits with time-resolving detectors, beam splitters, and optical interleavers. This scheme is robust against temporal and spectral errors caused by finite resolution detectors and does not require active devices such as high-speed switches and electro-optic modulators. We demonstrate that current technologies nearly meet the requirements for fault-tolerant quantum computation.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Shoichi Murakami, Rintaro Fujimoto, Toshiki Kobayashi, Rikizo Ikuta, Asuka Inoue, Takeshi Umeki, Shigehito Miki, Fumihiro China, Hirotaka Terai, Ryoichi Kasahara, Tetsuya Mukai, Nobuyuki Imoto, Takashi Yamamoto
Summary: This paper reports a fiber-coupled QFC module based on a PPLN waveguide, which can convert the wavelength of a single photon and preserve the quantum statistical property with a maximum device efficiency of 0.73.
Article
Optics
Wojciech Roga, Rikizo Ikuta, Tomoyuki Horikiri, Masahiro Takeoka
Summary: We analyze the generation of entanglement in a multipartite optical network and propose a protocol with advantageous rate-loss scalings. We provide theoretical formulas and performance analyses for distributing W states and Dicke states over star networks. We also study the feasibility of the protocol using Gaussian states as resources in realistic experimental conditions.
Article
Optics
Rikizo Ikuta
Summary: This study investigates the wave-particle duality of light and the intensity interferometric effect in the Hong-Ou-Mandel interferometer. The results show that classical light and nonclassical light exhibit different characteristics in terms of wave-particle duality, with nonclassical light being able to simultaneously display larger which-path information and intensity interference.
Proceedings Paper
Engineering, Electrical & Electronic
Rikizo Ikuta, Motoki Asano, Ryoya Tani, Takashi Yamamoto, Nobuyuki Imoto
LASER RESONATORS, MICRORESONATORS, AND BEAM CONTROL XXI
(2019)
