Article
Nanoscience & Nanotechnology
Jan Kettler, Nitika Vaish, Laure Mercier de Lepinay, Benjamin Besga, Pierre-Louis de Assis, Olivier Bourgeois, Alexia Auffeves, Maxime Richard, Julien Claudon, Jean-Michel Gerard, Benjamin Pigeau, Olivier Arcizet, Pierre Verlot, Jean-Philippe Poizat
Summary: Hybrid quantum optomechanical systems interface a macroscopic mechanical degree of freedom with a single two-level system, such as a single spin, a superconducting qubit, or a single optical emitter. While progress has been made in the microwave domain, challenges remain in the optical domain in achieving the reciprocal effect of a single quantum system on a macroscopic mechanical resonator.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Quanbo Jiang, Prithu Roy, Jean-Benoit Claude, Jerome Wenger
Summary: In this research, plasmonic nanoantennas were used to trap single colloidal quantum dots and enhance their photoluminescence without the need for further processing, achieving precise positioning of the quantum emitter at the nanoantenna hotspot. The dedicated nanoantenna design exhibited high trap stiffness for quantum dot trapping and relatively low trapping power, resulting in significantly improved emission characteristics of the single quantum dot.
Article
Quantum Science & Technology
Manish Kumar Mehta, Joseph Thomas Andrews, Pratima Sen
Summary: In this paper, a novel method is proposed to overcome the limitations of exciton and biexciton states only appearing at low temperatures, as well as the complexity of using lasers with different polarization states for CNOT operations. By utilizing ultrafast magnetic pulse CNOT gate operation in Mn-doped InSb quantum dots at room temperature, with only a circularly polarized laser pulse, the proposed method shows a significantly large fidelity calculation for CNOT gate.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Semyon Bodian, Richard J. Colchester, Thomas J. Macdonald, Filip Ambroz, Martha Briceno de Gutierrez, Sunish J. Mathews, Yu Man Mandy Fong, Efthymios Maneas, Kathryn A. Welsby, Ross J. Gordon, Paul Collier, Edward Z. Zhang, Paul C. Beard, Ivan P. Parkin, Adrien E. Desjardins, Sacha Noimark
Summary: Dual-modality imaging using complementary modalities, such as all-optical ultrasound and photoacoustic imaging, is well-suited for guiding minimally invasive surgical procedures. Quantum dots, a promising material for these devices, provide wavelength-selective optical absorption for improved imaging capabilities.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Xing Di, Changran Geng, Chang Guo, Yufen Shang, Hongtao Fu, Haonan Han, Xiaobin Tang
Summary: This study proposes a novel carbon quantum dot (cQD) sheeting to adjust the wavelength of Cherenkov emission and increase the optical signal. By combining a specific filter, the sheeting can be used for in vivo monitoring of the surface beam profile on patients with ambient light. Experimental results show that the cQD sheeting significantly improves the light intensity and SNR of optical images, and enables obtaining high SNR optical images in the presence of ambient light.
Article
Chemistry, Multidisciplinary
Hao Zhang, Parinaz Moazzezi, Juanjuan Ren, Brett Henderson, Cristina Cordoba, Vishal Yeddu, Arthur M. Blackburn, Makhsud Saidaminov, Irina Paci, Stephen Hughes, Reuven Gordon
Summary: Perovskite quantum dots (PQDs) show promise in various applications, including efficient solar cells, bright light emitting devices, and quantum sources of light. Researchers used double-nanohole optical trapping to size individual dots and observed the coupling between dots. The findings provide insights for in situ control of PQD growth and studies of their coupling with quantum information applications in mind.
Article
Chemistry, Applied
Jian Gan, Yan Wu, Feng Yang, Haiqiao Zhang, Xinyu Wu, Yajing Wang, Rui Xu
Summary: In this study, lignin-based carbon quantum dots were impregnated into a wood cellulose template to prepare photoluminescent transparent wood with light conversion. The results showed that different wavelength emissions and white light conversion could be achieved by controlling the properties of the carbon quantum dots. The new material exhibited excellent transmittance and optical properties, as well as improved mechanical performance.
CARBOHYDRATE POLYMERS
(2022)
Article
Chemistry, Multidisciplinary
Levente Mathe, Zoltan Kovacs-Krausz, Ioan Botiz, Ioan Grosu, Khadija El Anouz, Abderrahim El Allati, Liviu P. P. Zarbo
Summary: We theoretically analyze the phonon-assisted tunneling transport in a quantum dot connected to a Majorana bound state in a topological superconducting nanowire. We investigate the behavior of the current through the dot under different experimentally relevant parameters and the influence of electron-phonon coupling. The presence of electron-phonon coupling affects the current behavior similarly to the renormalized gate voltage. At large bias voltages, the current presents a dip or a plateau, depending on the size of the dot-Majorana coupling. Our results reveal the complex physics of quantum dot devices used to study Majorana bound states.
Article
Chemistry, Multidisciplinary
Steven J. Neuhaus, Emanuele Marino, Christopher B. Murray, Cherie R. . Kagan
Summary: Self-assembled superparticles composed of colloidal quantum dots are used to create microsphere cavities that support optically pumped lasing from whispering gallery modes. The lasing properties of CdSe/CdS quantum dot superparticles are found to be dependent on the excitation fluence and time, with blue-shifts occurring over a 15-minute period. A high-fluence light soaking protocol is established to counter this effect, resulting in reduced blue-shifts and enabling color-tunable lasing from red to green. This study suggests that quantum dot superparticles have the potential to be low-cost, robust, solution-processable, and tunable microlasers.
Article
Chemistry, Multidisciplinary
Saptarshi Mandal, Prolay Das
Summary: By combining carbon dots with DNA, the migration of charge in DNA was controlled through light irradiation, leading to a breakthrough in visible-light-induced charge transfer that could potentially be applied in optobioelectronics.
Article
Chemistry, Multidisciplinary
Jaco J. Geuchies, Baldur Brynjarsson, Gianluca Grimaldi, Solrun Gudjonsdottir, Ward van der Stam, Wiel H. Evers, Arjan J. Houtepen
Summary: Research demonstrates that by electrochemically doping films of CdSe/CdS/ZnS QDs, quantitative control over the gain threshold can be achieved, opening up a new route for the creation of cheap, solution-processable, low-threshold QD lasers.
Article
Nuclear Science & Technology
Changran Geng, Xing Di, Xu Li, Diyun Shu, Lei Zhu, Xiaobin Tang
Summary: The aim of this study was to test the utility of an optical imaging technique using a flexible carbon quantum dot sheet and optical camera to measure matching of adjacent radiation fields during electron radiotherapy treatments. The experiments demonstrated that the captured optical intensity was linear with delivered dose, independent of energy and dose rate. The results also showed that the optical imaging technique had potential to accurately detect and quantify the field match line in surface tissue during electron beam radiotherapy.
RADIATION MEASUREMENTS
(2023)
Article
Chemistry, Multidisciplinary
Harjot Singh, Demitry Farfurnik, Zhouchen Luo, Allan S. Bracker, Samuel G. Carter, Edo Waks
Summary: This study demonstrates the coupling of an InAs/GaAs quantum dot to a fabricated bullseye cavity with a high cooperativity, providing nearly degenerate and Gaussian polarization modes for efficient optical accessing. The researchers observed extremely short spontaneous emission lifetimes of the quantum dot and approximately 80% transparency of light reflected from the cavity. Utilizing induced transparency for photon switching and coherent control of the quantum dot spin could contribute to the establishment of quantum networks.
Article
Quantum Science & Technology
Michael Cosacchi, Tim Seidelmann, Adam Mielnik-Pyszczorski, Miriam Neumann, Thomas K. Bracht, Moritz Cygorek, Alexei Vagov, Doris E. Reiter, Vollrath M. Axt
Summary: This paper proposes a single-photon buffering device composed of a quantum dot doped with a single Mn atom, and achieves the storage and retrieval of photons through optical methods.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Rosinildo Fideles do Nascimento, Anielle Christine Almeida Silva, Tasso O. Sales, Artur F. Sonsin, Eduardo Jorge da Silva Fonseca, Samuel T. Souza, Ygor M. de Oliveira, Fabiane C. de Abreu, Noelio Oliveira Dantas
Summary: The study demonstrates that the ratio of CdSe/CdS ultrasmall quantum dots conjugated with reduced graphene oxide significantly affects the properties of the nanocomposites, with a higher proportion of USQDs leading to luminescence quenching and an increase in nonradiative decay rate due to electron transfer processes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
