Article
Optics
John Hannegan, James D. Siverns, Qudsia Quraishi
Summary: This research demonstrates entanglement between matter and photons in quantum networks, interaction and conversion at different wavelengths, and a decrease in fidelity due to reduced signal-to-noise ratio of detectors.
Article
Nanoscience & Nanotechnology
Uday Saha, James D. D. Siverns, John Hannegan, Qudsia Quraishi, Edo Waks
Summary: Trapped ions are a leading candidate for scalable and long-distance quantum networks. This study demonstrates the generation of telecom photons using a low-noise quantum frequency conversion scheme from photons emitted from the dipole transition of a trapped barium ion. The achieved conversion efficiency and signal-to-background ratio are important steps towards achieving trapped ion quantum networks over long distances for distributed quantum computing and quantum communication.
Article
Quantum Science & Technology
Beatrice Da Lio, Carlos Faurby, Xiaoyan Zhou, Ming Lai Chan, Ravitej Uppu, Henri Thyrrestrup, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Peter Lodahl, Leonardo Midolo
Summary: This article presents a quantum frequency conversion scheme for converting single photons emitted by quantum dots to the telecommunication C band. The conversion achieves high end-to-end efficiency, purity, and indistinguishability.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Multidisciplinary Sciences
J. M. Pino, J. M. Dreiling, C. Figgatt, J. P. Gaebler, S. A. Moses, M. S. Allman, C. H. Baldwin, M. Foss-Feig, D. Hayes, K. Mayer, C. Ryan-Anderson, B. Neyenhuis
Summary: The QCCD proposal outlines a blueprint for a universal quantum computer using mobile ions as qubits, limiting quantum interactions to small ion crystals to maintain low error rates demonstrated in small experiments. The integration of necessary elements into a programmable trapped-ion quantum computer has led to the realization of a teleported CNOT gate with negligible crosstalk error and high quantum volume, showing the potential for high-performance quantum computers.
Article
Chemistry, Multidisciplinary
Minho Choi, Seongmoon Jun, Kie Young Woo, Hyun Gyu Song, Hwan-Seop Yeo, Sunghan Choi, Doyoun Park, Chung-Hyun Park, Yong-Hoon Cho
Summary: This paper introduces a nanoscale focus pinspot (NFP) technique to improve the single-photon purity of QDs, enabling QDs to exhibit better single-photon properties at higher temperatures. The NFP technique is nondestructive, preserving the physical structure and photonic functions of QDs, showing promising potential for various high-purity quantum emitters.
Article
Physics, Multidisciplinary
Alan C. Santos, R. Bachelard
Summary: In this Letter, we demonstrate the efficient generation of entanglement between two artificial giant atoms using photon-mediated interactions in a waveguide. By taking advantage of adjustable decay processes and interference processes, the spontaneous sudden birth of entanglement is significantly enhanced with giant atoms. Highly entangled states can also be generated in the steady-state regime by driving the system with a resonant classical field. We propose using the emitted light statistics as a witness of entanglement, with giant photon bunching observed near maximal entanglement regime. These results pave the way for generating quantum correlations and manipulating photon statistics in systems of giant atoms.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Jikun Xie, Shengli Ma, Yalong Ren, Xinke Li, Shaoyan Gao, Fuli Li
Summary: We propose a novel scheme for coherent quantum transduction between microwave and optical signals based on a hybrid magnonic system. By utilizing a YIG sphere with optomechanical and optomagnetic properties to couple with a superconducting microwave resonator, we demonstrate the realization of nonreciprocal single-photon state conversion between microwave and optical modes through quantum interference effect.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Eli Chertkov, Justin Bohnet, David Francois, John Gaebler, Dan Gresh, Aaron Hankin, Kenny Lee, David Hayes, Brian Neyenhuis, Russell Stutz, Andrew C. Potter, Michael Foss-Feig
Summary: An experiment with a trapped-ion quantum processor demonstrates the efficient simulation of the evolution of infinite entangled states using holographic technique and quantum tensor-network methods. The results show excellent quantitative agreement with theoretical predictions, indicating the potential of practical quantum computational advantage in science and technology.
Article
Multidisciplinary Sciences
Pavel Hrmo, Benjamin Wilhelm, Lukas Gerster, Martin W. van Mourik, Marcus Huber, Rainer Blatt, Philipp Schindler, Thomas Monz, Martin Ringbauer
Summary: Quantum information carriers naturally occupy high-dimensional Hilbert spaces, and high-dimensional (qudit) quantum systems are becoming a powerful resource for quantum processors. Generating the desired interaction efficiently in these systems is crucial. In this study, the authors demonstrate the implementation of a native two-qudit entangling gate up to dimension 5 in a trapped-ion system. They use a light-shift gate mechanism to generate genuine qudit entanglement in a single application of the gate, which seamlessly adapts to the local dimension of the system with a calibration overhead independent of the dimension. Native entangling techniques for qudits are important for encoding quantum information.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Alexandra Mirzac, Sergiu Carlig, Mihai A. Macovei
Summary: This study explores the multiphoton quantum dynamics between a leaking single-mode quantized cavity field and a resonantly driven two-level system with permanent dipoles. The frequencies of the interacting subsystems differ greatly, in the microwave range for the cavity and in the optical domain for the two-level emitter. The emitter couples to the resonator mode only through its diagonal dipole moments, and the external coherent driving of the two-level subsystem results in a generalized Rabi frequency distinct from the resonator's frequency. As a result, the highly dispersive interaction regime leads to the cavity's multiphoton quantum dynamics and photon conversion from optical to microwave ranges.
Article
Physics, Applied
Fangzhou Jin, Weiping Liu, Hui Zhou
Summary: Efficient spin-photon interfaces are crucial for quantum network and distributed quantum computing. This paper proposes a method to establish a coherent interface between photon and solid-state spin system, allowing for the generation of entanglement between distant spins.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Multidisciplinary
Stefan Richter, Sebastian Wolf, Joachim von Zanthier, Ferdinand Schmidt-Kaler
Summary: Cross-correlation signals are analyzed to determine spatial frequency and distance of ions, showing excellent agreement with independent measurements. The method is shown to be effective for two-dimensional arrays of emitters, providing structural information where direct imaging techniques fail.
PHYSICAL REVIEW LETTERS
(2021)
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
Hai-Tao Tu, Kai-Yu Liao, Zuan-Xian Zhang, Xiao-Hong Liu, Shun-Yuan Zheng, Shu-Zhe Yang, Xin-Ding Zhang, Hui Yan, Shi-Liang Zhu
Summary: High-resolution quantum-dot LEDs demonstrated using transfer printing could be beneficial for next-generation displays. Coherent microwave-to-optics transduction is achieved using Rydberg atoms and off-resonant scattering technique, with high efficiency and wide bandwidth.
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
Physics, Multidisciplinary
Yoshiaki Tsujimoto, Chenglong You, Kentaro Wakui, Mikio Fujiwara, Kazuhiro Hayasaka, Shigehito Miki, Hirotaka Terai, Masahide Sasaki, Jonathan P. Dowling, Masahiro Takeoka
NEW JOURNAL OF PHYSICS
(2020)
Article
Quantum Science & Technology
Koichiro Miyanishi, Naoki Ichijo, Makoto Motoyama, Akinori Kagawa, Makoto Negoro, Masahiro Kitagawa
QUANTUM SCIENCE AND TECHNOLOGY
(2020)
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
Optics
Yoshiaki Tsujimoto, Kentaro Wakui, Mikio Fujiwara, Masahide Sasaki, Masahiro Takeoka
Summary: By utilizing a pump laser with a high repetition rate, the study increased the generation rate of single photons and successfully suppressed the creation of higher-order pairs. The research team developed a simple model to consider the effect on spectral purity, and experimentally demonstrated high-visibility interference between two independent HSPs generated by SPDC.
Article
Chemistry, Physical
K. Miyanishi, W. Mizukami, M. Motoyama, N. Ichijo, A. Kagawa, M. Negoro, M. Kitagawa
Summary: In this study, the lifetimes of nuclear spin states composed of proton spin pairs were predicted using the molecular dynamics method and quantum chemistry simulations. Various interactions were considered, and the calculated values matched the experimental results. This research provides insights for the molecular design of NMR applications and predicting the nuclear spin relaxation time of synthetic molecules in advance.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Biophysics
Toshihiko Sugiki, Akihiro Ito, Yuko Hatanaka, Masaki Tsukamoto, Tsuyoshi Murata, Koichiro Miyanishi, Akinori Kagawa, Toshimichi Fujiwara, Masahiro Kitagawa, Yasushi Morita, Makoto Negoro
Summary: In this study, the direct, sensitive, and real-time observation of HGPRT-catalyzed conversion of favipiravir to favipiravir-RMP was demonstrated using F-19-NMR and P-31-NMR techniques. This method is not only essential for understanding the pharmacokinetics of favipiravir but also applicable for enzyme assays and screening of new prodrugs.
NMR IN BIOMEDICINE
(2023)
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
Chemistry, Multidisciplinary
Dorothea Pinotsi, Rui Tian, Pratyush Anand, Koichiro Miyanishi, Jens M. Boss, Kevin Kai Chang, Pol Welter, Frederick T. -K. So, Daiki Terada, Ryuji Igarashi, Masahiro Shirakawa, Christian L. Degen, Takuya F. Segawa
Summary: In this study, 5 nanometer sized detonation nanodiamonds (DNDs) were investigated as potential single-particle labels for distance measurements in biomolecules. Nitrogen-vacancy (NV) defects in the crystal lattice could be detected through their fluorescence and optically-detected magnetic resonance (ODMR). Two complementary approaches based on spin-spin coupling or optical super-resolution imaging were proposed for single-particle distance measurements. The first approach focused on measuring the mutual magnetic dipole-dipole coupling between two NV centers in close DNDs using a pulse ODMR sequence, while the second approach successfully localized the NV centers in DNDs using STORM super-resolution imaging, enabling optical nanometer-scale single-particle distance measurements.
NANOSCALE ADVANCES
(2023)
Article
Biochemical Research Methods
Akinori Kagawa, Ryosuke Kusumi, Rintarou Nagase, Yuki Morishita, Koichiro Miyanishi, Kazuyuki Takeda, Masahiro Kitagawa, Makoto Negoro
Summary: We conducted research on dynamic nuclear polarization using electron spins in the photo-excited triplet state (Triplet-DNP) in magnetically oriented microcrystal arrays (MOMAs) of pentacene-doped p-terphenyl. Triplet-DNP in MOMAs offers high dynamic polarization comparable to that in single crystals, unlike the conventional approach in powder samples. The enhanced 1H polarization in the one-dimensional MOMA can be higher than that attainable in the powder sample and comparable to that in single crystals and in three-dimensional MOMAs. Triplet-DNP of the MOMAs has potential applications such as polarization of co-doped target molecules and dissolution experiments.
JOURNAL OF MAGNETIC RESONANCE
(2023)
Article
Chemistry, Physical
Haruki Sato, Koichiro Miyanishi, Makoto Negoro, Akinori Kagawa, Yusuke Nishiyama, Satoshi Horike, Koichi Nakamura, Munehiro Inukai
Summary: This study demonstrates the hyperpolarization of biomolecules in eutectic crystals using photoexcited triplet electrons at room temperature. The eutectic crystals, composed of benzoic acid doped with the polarization source and analyte domains, were prepared using a melting-quenching process. Solid-state NMR analysis elucidates spin diffusion between the benzoic acid and analyte domain, indicating the transfer of hyperpolarization from the benzoic acid domain to the analyte domain.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
K. Miyanishi, T. Sugiki, T. Matsui, R. Ozawa, Y. Hatanaka, H. Enozawa, Y. Nakamura, T. Murata, A. Kagawa, Y. Morita, T. Fujiwara, M. Kitagawa, M. Negoro
Summary: The sensitivity of solution-state C-13 NMR for studying intermolecular interactions in a biomolecular system was improved by using hyperpolarized solution samples at room temperature. Eutectic crystals composed of C-13-salicylic acid and benzoic acid doped with pentacene were hyperpolarized using dynamic nuclear polarization. The binding of human serum albumin and C-13-salicylate was observed with significantly enhanced sensitivity under mild conditions.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Optics
Thomas Walker, Samir Vartabi Kashanian, Travers Ward, Matthias Keller
Article
Optics
Koichiro Miyanishi, Yuichiro Matsuzaki, Hiraku Toida, Kosuke Kakuyanagi, Makoto Negoro, Masahiro Kitagawa, Shiro Saito
