Article
Chemistry, Multidisciplinary
Chang-Min Lee, Mustafa Atabey Buyukkaya, Samuel Harper, Shahriar Aghaeimeibodi, Christopher J. K. Richardson, Edo Waks
Summary: In this study, a bright telecom-wavelength single photon source is demonstrated based on a tapered nanobeam containing InAs/InP quantum dots. The tapered nanobeam enables directional and Gaussian-like far-field emission of the quantum dots, resulting in a high-end brightness. Adopting quasi-resonant excitation helps reduce multiphoton emission and decoherence, achieving a coherence time and postselected Hong-Ou-Mandel visibility suitable for long-distance quantum networks.
Article
Materials Science, Multidisciplinary
Sergei Malykhin, Yuliya Mindarava, Rinat Ismagilov, Fedor Jelezko, Alexander Obraztsov
Summary: In this study, single-crystal diamond needles with micrometer-scale sharp pyramids were successfully produced using a combination of chemical vapor deposition and thermal oxidation processes. Various color centers, such as nitrogen-vacancy (NV), silicon-vacancy (SiV), and germanium-vacancy (GeV), were formed in these needles during plasma enhanced chemical vapor deposition. The luminescent characteristics of the needles were observed, and the mechanisms of impurities introduction into the crystal lattice during the growth process were proposed and verified.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Sascha Kolatschek, Cornelius Nawrath, Stephanie Bauer, Jiasheng Huang, Julius Fischer, Robert Sittig, Michael Jetter, Simone Luca Portalupi, Peter Michler
Summary: The combination of semiconductor quantum dots with photonic cavities has shown promising results in achieving nonclassical light sources with high brightness, indistinguishability, and repetition rate. By coupling InGaAs/GaAs QDs to a circular Bragg grating cavity, enhancements in geometric extraction efficiency and brightness have been demonstrated under different excitation conditions. Through p-shell pumping, high count rates with pure single-photon emission have been achieved, along with good single-photon purity at temperatures of up to 77 K.
Article
Physics, Multidisciplinary
S. E. Thomas, M. Billard, N. Coste, S. C. Wein, Priya, H. Ollivier, O. Krebs, L. Tazairt, A. Harouri, A. Lemaitre, I Sagnes, C. Anton, L. Lanco, N. Somaschi, J. C. Loredo, P. Senellart
Summary: By utilizing the intrinsic linear dipole in semiconductor quantum dots within cavities through phonon-assisted excitation, deterministic operation and emission of highly polarized single photons are achieved.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Xin Cao, Jingzhong Yang, Tom Fandrich, Yiteng Zhang, Eddy P. Rugeramigabo, Benedikt Brechtken, Rolf J. Haug, Michael Zopf, Fei Ding
Summary: Large-scale quantum networks require long-lived quantum memories as stationary nodes to interact with light qubits. Epitaxially grown quantum dots have potential for generating high purity, indistinguishable single and entangled photons. Coupling these emitters to memories with long coherence times enables the development of hybrid nanophotonic devices that incorporate the advantages of both systems.
Review
Physics, Multidisciplinary
Zhiping Ju, Junjie Lin, Si Shen, Botao Wu, E. Wu
Summary: Single color centers in diamond play a crucial role in quantum physics, and their preparation often requires complex environments. However, femtosecond laser processing has been proven to be an efficient method for producing these color centers in a fast and precise manner.
ADVANCES IN PHYSICS-X
(2021)
Article
Quantum Science & Technology
Cornelius Nawrath, Raphael Joos, Sascha Kolatschek, Stephanie Bauer, Pascal Pruy, Florian Hornung, Julius Fischer, Jiasheng Huang, Ponraj Vijayan, Robert Sittig, Michael Jetter, Simone Luca Portalupi, Peter Michler
Summary: Semiconductor quantum dots are identified as potential non-classical light sources for quantum implementations. This study presents an InAs/InGaAs/GaAs quantum dot emitting in the telecom C-band, coupled with a circular Bragg grating. The cavity structure stands out for its high broadband collection efficiency and attainable Purcell factors. The dot shows high brightness and single-photon purity, while maintaining low multi-photon contribution. It is also compatible with temperatures up to 40 K, making it suitable for out-of-the-lab implementations.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
O. Davidson, R. Finkelstein, E. Poem, O. Firstenberg
Summary: An efficient generation method of narrowband single photons compatible with rubidium D2 line is realized, using spatially-multiplexed heralded source based on four-wave mixing in hot rubidium vapor. The generated single photons exhibit high rate, low noise, and indistinguishability, with a five-fold tunability in temporal width demonstrated. The experimental results are well supported by a theoretical model.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Applied
Christopher L. Morrison, Markus Rambach, Zhe Xian Koong, Francesco Graffitti, Fiona Thorburn, Ajoy K. Kar, Yong Ma, Suk-In Park, Jin Dong Song, Nick G. Stoltz, Dirk Bouwmeester, Alessandro Fedrizzi, Brian D. Gerardot
Summary: This study successfully demonstrates the quantum frequency conversion of near-infrared photons from semiconductor quantum dots to the telecommunication C-band, achieving high conversion efficiency and count rates suitable for fiber networks.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Lingdong Kong, Qingyuan Zhao, Hui Wang, Jiawei Guo, Haiyangbo Lu, Hao Hao, Shuya Guo, Xuecou Tu, Labao Zhang, Xiaoqing Jia, Lin Kang, Xinglong Wu, Jian Chen, Peiheng Wu
Summary: The spectrometer without wavelength multiplexing optics reduces complexity and physical footprint, achieving broadband spectral responsivity and high resolution. Additionally, precise time-of-flight measurements enable multifunctional LiDAR systems.
Article
Physics, Multidisciplinary
Yong-Hong Ma, Yuan Xu, Quan-Zhen Ding, Yu-Sui Chen
Summary: This paper proposes a novel method for solid-state spin squeezing based on SiV centers, and numerical analysis shows that spin squeezing can be generated under certain conditions despite the presence of interference. This solid-state spin squeezing technology may have applications in magnetometers, interferometry, and other precise measurements.
Article
Chemistry, Physical
Bing Yang, Haining Li, Biao Yu, Jiaqi Lu, Nan Huang, Lusheng Liu, Xin Jiang
Summary: The addition of TMS gas during the CVD process can improve the photoluminescence efficiency of SiV centers and form diamond/SiC composite films with high-brightness SiV centers. However, excessive TMS gas flow leads to an increase in SiC concentration and deterioration of photoluminescence of SiV centers.
Article
Optics
Serge Massar, Stephane Clemmen
Summary: A new single photon source based on active multiplexing of heralded single photons is proposed, requiring limited physical resources compared to previously reported architectures. Feasibility, purity, and indistinguishability of single photons are discussed in terms of key parameters for potential implementation.
Article
Materials Science, Multidisciplinary
Mikhail Aleksandrovich Lobaev, Dmitry Borisovich Radishev, Anatoly Leontievich Vikharev, Alexey Mikhailovich Gorbachev, Sergey Aleksandrovich Bogdanov, Vladimir Aleksandrovich Isaev, Stanislav Alekseevich Kraev, Andrey Igorevich Okhapkin, Ekaterina Aleksandrovna Arkhipova, Evgeniy Valentinovich Demidov, Mikhail Nikolaevich Drozdov
Summary: The results of a study on electroluminescence of silicon vacancy color centers (SiV centers) in a diamond merged diode are presented. A line at 738 nm corresponding to a SiV color center in a negative charge state is detected, while emission at 946 nm corresponding to a SiV color center in a neutral charge state is not observed. The electroluminescence of color centers is only observed in the p-i-n region of the diode, indicating the necessity of both types of charge carriers for electroluminescence excitation. A significant dependence of the photoluminescence intensity of SiV centers on the applied voltage is found.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Natasha Tomm, Alisa Javadi, Nadia Olympia Antoniadis, Daniel Najer, Matthias Christian Loebl, Alexander Rolf Korsch, Ruediger Schott, Sascha Rene Valentin, Andreas Dirk Wieck, Arne Ludwig, Richard John Warburton
Summary: A single-photon source is crucial in quantum communication, quantum simulation, and linear optics-based quantum computing, with stringent requirements on efficiency and coherence. By utilizing gated quantum dots in a tunable microcavity, a high-end-to-end efficiency single-photon source can be achieved, enabling on-demand single-photon creation with high probability and coherence in trains of thousands of photons.
NATURE NANOTECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Jianyu Zhao, Qing Yang, Frederik Dreyer, Daniel Krueger, Fedor Jelezko, Jens Anders
Summary: In this article, a CMOS-based broadband nuclear magnetic resonance (NMR) magnetometer system with magnetic field searching and automatic tuning capabilities is presented. The system utilizes an NMR coil and a digitally tunable capacitor (DTC) to measure magnetic fields with nanotesla resolution. By automatically sweeping its excitation frequency and analyzing the NMR signal, the system is able to determine the unknown magnetic field with high precision. The presented magnetometer achieves excellent field resolution and sensitivity over a wide frequency range.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Optics
Genko T. Genov, Simon Rochester, Marcis Auzinsh, Fedor Jelezko, Dmitry Budker
Summary: Efficient and robust swapping of quantum state populations is crucial for various applications. STIRAP is known for its efficient and robust inversion of ground state populations, but it is sensitive to the initial state of the system. In this contribution, we demonstrate that a slight modification of STIRAP, by introducing a non-zero single-photon detuning, allows for efficient and robust population swapping for any initial state. Our work has implications for efficient and robust state preparation, dynamical decoupling, and the design of quantum gates in ground state qubits via two-photon interactions.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
William Beatrez, Christoph Fleckenstein, Arjun Pillai, Erica de Leon Sanchez, Amala Akkiraju, Jesus Diaz Alcala, Sophie Conti, Paul Reshetikhin, Emanuel Druga, Marin Bukov, Ashok Ajoy
Summary: Discrete time crystals are non-equilibrium many-body phases of matter characterized by spontaneously broken discrete time-translation symmetry under periodic driving. At sufficiently high driving frequencies, the system enters the Floquet prethermalization regime, in which the periodically driven many-body state has a lifetime vastly exceeding the intrinsic decay time of the system. Here, we report the observation of long-lived prethermal discrete time-crystalline order in a three-dimensional (3D) lattice of 13C nuclei in diamond at room temperature.
Article
Chemistry, Physical
Alastair Marshall, Alon Salhov, Martin Gierse, Christoph Mueller, Michael Keim, Sebastian Lucas, Anna Parker, Jochen Scheuer, Christophoros Vassiliou, Philipp Neumann, Fedor Jelezko, Alex Retzker, John W. Blanchard, Ilai Schwartz, Stephan Knecht
Summary: We present a technique for transferring parahydrogen-derived singlet order into 13C magnetization using adiabatic radio frequency sweeps at microtesla fields, enabling real-time monitoring of processes within the body. By avoiding relaxation induced by strongly coupled quadrupolar nuclei, significant improvements in achievable polarization, reaching above 60% nuclear spin polarization, are demonstrated for several molecules relevant in metabolic imaging. Furthermore, a site-selective deuteration scheme is introduced to enhance the efficiency of the polarization transfer.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Martin Gierse, Luca Nagel, Michael Keim, Sebastian Lucas, Tobias Speidel, Tobias Lobmeyer, Gordon Winter, Felix Josten, Senay Karaali, Maximilian Fellermann, Jochen Scheuer, Christoph Mueller, Frits van Heijster, Jason Skinner, Jessica Loeffler, Anna Parker, Jonas Handwerker, Alastair Marshall, Alon Salhov, Bilal El-Kassem, Christophoros Vassiliou, John W. Blanchard, Roman Picazo-Frutos, James Eills, Holger Barth, Fedor Jelezko, Volker Rasche, Franz Schilling, Ilai Schwartz, Stephan Knecht
Summary: We propose a versatile method for preparing hyperpolarized [1-13C]fumarate as a contrast agent for preclinical MRI. We compared this method to a state-of-the-art d-DNP system and found similar polarization levels, but significantly lower preparation effort and faster dosing time for the PHIP process. The in vivo usage of hyperpolarized fumarate as a perfusion agent and the metabolic conversion of fumarate to malate in tumor-bearing mice are demonstrated.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Polymer Science
Lisa Chen, Tamara Rudolf, Remi Blinder, Nithin Suryadevara, Ashley Dalmeida, Philipp J. Welscher, Markus Lamla, Mona Arnold, Ulrich Herr, Fedor Jelezko, Mario Ruben, Alexander J. C. Kuehne
Summary: We synthesized stable luminescent radical nanoparticles with tunable diameter and highly suitable for bioimaging. These nanoparticles are stable in water, emit light in the red and near-infrared spectra, and can exhibit paramagnetic properties for dual-mode optical and magnetic resonance imaging. This study investigates their synthesis, optical and magnetic properties, and the effect of the conjugated polymer backbone and electron-withdrawing substituents on the electronic properties of the open-shell molecule in the polymer network.
Article
Chemistry, Analytical
Jiazhao Tian, Ressa S. S. Said, Fedor Jelezko, Jianming Cai, Liantuan Xiao
Summary: NV centers are a promising platform in the field of quantum sensing, and magnetometry based on NV centers has achieved concrete development in biomedicine and medical diagnostics. In this paper, a Bayesian estimation phase-modulated (B-PM) method was proposed to improve the sensitivity of NV center sensors under wide inhomogeneous broadening and field-amplitude drift conditions. The B-PM method reduced time consumption and increased average fidelity, making it a valuable tool for quantum optimal control.
Article
Multidisciplinary Sciences
Hanfeng Wang, Matthew E. Trusheim, Laura Kim, Hamza Raniwala, Dirk R. Englund
Summary: This study proposes a programmable architecture based on diamond color centers driven by electric or strain fields, aiming to reduce power consumption and cross-talk constraints in large-scale quantum networks. By densely packing diamond color centers in a programmable electrode array and driving quantum gates with electric or strain fields, this 'field programmable spin array’ (FPSA) enables high-speed control of individual color centers with low cross-talk and power dissipation. Integrated with a slow-light waveguide for efficient optical coupling, the FPSA serves as a quantum interface for optically-mediated entanglement, showing increased entanglement generation rate scaling into the thousand-qubit regime.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Xiyuan Lu, Mingkang Wang, Feng Zhou, Mikkel Heuck, Wenqi Zhu, Vladimir A. Aksyuk, Dirk R. Englund, Kartik Srinivasan
Summary: The authors demonstrate a method for generating orbital angular momentum (OAM) using photonic crystal ring resonators, while maintaining high cavity quality factors (up to 10^6). By ejecting high angular momentum states of a whispering gallery mode (WGM) microresonator through a grating-assisted mechanism, a scalable and chip-integrated solution for OAM generation is achieved.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Uday Saha, James D. Siverns, John Hannegan, Mihika Prabhu, Qudsia Quraishi, Dirk Englund, Edo Waks
Summary: In this work, we demonstrate the routing of single photons from a trapped ion using a photonic integrated circuit. The emission of the ion is matched to the operating wavelength of the circuit through quantum frequency conversion. Programmable phase shifters are used to switch the single photons between output channels and achieve a 50:50 beam splitting condition. These results are important for programmable routing and entanglement distribution in large-scale quantum networks and distributed quantum computers.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Guoqing Wang, Ariel Rebekah Barr, Hao Tang, Mo Chen, Changhao Li, Haowei Xu, Andrew Stasiuk, Ju Li, Paola Cappellaro
Summary: Solid-state spin defects, specifically nuclear spins with long coherence times, are potential candidates for quantum memories and sensors. However, their current performance is limited by dephasing caused by variations in their intrinsic interactions. A proposed unbalanced echo technique can overcome this challenge and preserve quantum information.
PHYSICAL REVIEW LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Nicholas Nunn, Sergey Milikisiyants, Marco D. Torelli, Richard Monge, Tom Delord, Alexander I. Shames, Carlos A. Meriles, Ashok Ajoy, Alex I. Smirnov, Olga A. Shenderova
Summary: High-temperature annealing is a promising method to enhance spin properties of NV centers in diamond particles. We investigated the effects of conventional annealing and high-temperature annealing on particles of different sizes. The results show that prolonged annealing at 1600 degrees C increases NV spin relaxation times and fluorescence contrast, while decreasing the content of NV centers in the particles.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Physics, Multidisciplinary
William Beatrez, Arjun Pillai, Otto Janes, Dieter Suter, Ashok Ajoy
Summary: We report on experiments that quantify the role of a central electronic spin as a relaxation source for nuclear spins in its nanoscale environment. Our strategy exploits hyperpolarization injection from the electron as a means to controllably probe an increasing number of nuclear spins in the bath and subsequently interrogate them with high fidelity. These results suggest interesting new means to spatially discriminate nuclear spins in a nanoscale environment and have direct relevance to dynamic nuclear polarization and quantum sensors and memories constructed from hyperpolarized nuclei.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
D. Wirtitsch, G. Wachter, S. Reisenbauer, M. Gulka, V. Ivady, F. Jelezko, A. Gali, M. Nesladek, M. Trupke
Summary: We propose and experimentally demonstrate a method to increase the sensitivity of spin measurements on nitrogen vacancy (NV) centers in diamond by utilizing the charge state transitions of the defect. The method involves a two-step procedure of purifying the charge state and obtaining high spin polarization. The results show significant improvement in spin contrast and reduction in initialization error.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
Haowei Xu, Hao Tang, Guoqing Wang, Changhao Li, Boning Li, Paola Cappellaro, Ju Li
Summary: In this work, an efficient two-photon pumping scheme utilizing the optonuclear quadrupolar effect is proposed to excite the isomeric state of 229Th. The study demonstrates the possibility of achieving population inversion between the nuclear isomeric and ground states, which opens up a new path towards the realization of nuclear lasers.
