Article
Chemistry, Multidisciplinary
Alexander K. Oanta, Kelsey A. Collins, Austin M. Evans, Saied Md Pratik, Lyndon A. Hall, Michael J. Strauss, Seth R. Marder, Deanna M. D'Alessandro, Tijana Rajh, Danna E. Freedman, Hong Li, Jean-Luc Bredas, Lei Sun, William R. Dichtel
Summary: This study introduces a method of embedding electronic spin qubits into two-dimensional polymers and analyzes the spin relaxation times at different spin densities and temperatures. The results show that lower spin densities lead to longer spin relaxation times, while higher spin densities decrease the spin relaxation times. The study demonstrates that dispersing electronic spin qubits within layered 2DPs enables chemical control of their inter-qubit interactions and spin decoherence times.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Richard Monge, Tom Delord, Nicholas V. Proscia, Zav Shotan, Harishankar Jayakumar, Jacob Henshaw, Pablo R. Zangara, Artur Lozovoi, Daniela Pagliero, Pablo D. Esquinazi, Toshu An, Inti Sodemann, Vinod M. Menon, Carlos A. Meriles
Summary: A broad effort is being made to understand and utilize the interaction between superconductors and spin-active color centers, with the goal of hybrid quantum devices and novel imaging techniques for superconducting materials. However, most work ignores the interplay between either system and the environment created by the color center host. In this study, a diamond scanning probe is used to investigate the spin dynamics of a single nitrogen-vacancy (NV) center near a superconducting film. The presence of the superconductor is found to increase the NV spin coherence lifetime, which may be attributed to a change in the electric noise caused by a redistribution of charge carriers due to the superconductor. These findings not only shed light on the dynamics of shallow NV spin coherence, but also offer new possibilities for noise spectroscopy and imaging of superconductors.
Article
Nanoscience & Nanotechnology
Florian N. M. Froning, Leon C. Camenzind, Orson A. H. van der Molen, Ang Li, Erik P. A. M. Bakkers, Dominik M. Zumbuehl, Floris R. Braakman
Summary: Quantum computers promise to execute complex tasks exponentially faster than classical computers, but require fast and selective control of individual qubits while maintaining coherence. Operating a hole spin qubit in a Ge/Si nanowire all-electrically demonstrates the principle of switching between fast control and increased coherence.
NATURE NANOTECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Dorian A. Gangloff, Leon Zaporski, Jonathan H. Bodey, Clara Bachorz, Daniel M. Jackson, Gabriel Ethier-Majcher, Constantin Lang, Edmund Clarke, Maxime Hugues, Claire Le Gall, Mete Atature
Summary: The study proposes a method to reconstruct the nuclear spin ensemble by exploiting its response to collective spin excitations, demonstrating that the ensemble is in a non-thermal, correlated state with a significant deviation from the classical prediction. The reconstructed species-resolved polarizations suggest the presence of inter-particle coherences and serve as entanglement witnesses for the formation of a dark many-body state within the ensemble.
Article
Chemistry, Multidisciplinary
Autumn Y. Lee, Troy A. Colleran, Amisha Jain, Jens Niklas, Brandon K. Rugg, Tomoyasu Mani, Oleg G. Poluektov, Jacob H. Olshansky
Summary: The inherent spin polarization in photogenerated spin-correlated radical pairs makes them promising for quantum computing and quantum sensing. In this work, dye molecule-inorganic quantum dot conjugates are prepared and shown to produce photogenerated spin-polarized states. By performing optical spectroscopy and electron paramagnetic resonance experiments, it is demonstrated that the spin states can be accessed and manipulated with microwave pulses. This work opens up possibilities for using highly tailorable inorganic nanoparticles as a new class of qubit materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Sumana Kumar, Abha Misra
Summary: In this study, a three-dimensional carbon foam-based asymmetric planar micro-supercapacitor was fabricated, showing superior electrochemical performance and ultrahigh supercapacitance. This micro-supercapacitor achieved a high supercapacitance of 18.4 mF cm(-2) at a scan rate of 5 mV s(-1) and maintained 86.1% capacitance retention after 10,000 electrochemical cycles.
Article
Multidisciplinary Sciences
Ryan M. Jock, N. Tobias Jacobson, Martin Rudolph, Daniel R. Ward, Malcolm S. Carroll, Dwight R. Luhman
Summary: This research demonstrates a method for controlling electron spin qubits on a silicon heterointerface through spin-orbit effects, without the need for complex nanofabrication equipment. The method offers high logic gate orthogonality and long qubit coherence time, while enabling fast control. The study also investigates charge noise in a silicon double quantum dot through dynamical decoupling experiments and evaluates qubit frequency drift and low-frequency noise.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Nathanael P. Kazmierczak, Ryan G. Hadt
Summary: This study demonstrates that spin relaxation anisotropy in pulsed electron paramagnetic resonance is a powerful spectroscopic probe for molecular spin dynamics in transition metal complexes. Through analysis of the spin-orbit coupled wave functions, the researchers derived an analytical theory that accurately reproduces the experimental results. Compound-by-compound deviations from the average anisotropy provide a promising approach for observing specific ligand field and vibronic excited state coupling effects on spin relaxation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Andrei Ruskuc, Chun-Ju Wu, Jake Rochman, Joonhee Choi, Andrei Faraon
Summary: Solid-state nuclear spins surrounding individual qubits have great potential for quantum networks, computation, and simulation. In this study, a highly coherent, optically addressed Yb(3+) qubit doped into a nuclear-spin-rich crystal was used to develop a robust quantum control protocol for manipulating the multi-level nuclear spin states of neighbouring lattice ions. The researchers successfully polarized the nuclear spin ensemble, generated collective spin excitations, and implemented a quantum memory using these dense nuclear spin ensembles. They also demonstrated the preparation and measurement of maximally entangled Bell states. Their deterministic and reproducible platform provides a framework for building large-scale quantum networks using single rare-earth ion qubits.
Article
Quantum Science & Technology
Y. Kojima, T. Nakajima, A. Noiri, J. Yoneda, T. Otsuka, K. Takeda, S. Li, S. D. Bartlett, A. Ludwig, A. D. Wieck, S. Tarucha
Summary: We demonstrate a scheme for quantum teleportation of single-electron spin qubit in a triple quantum dot using direct Bell measurement and the Pauli exclusion principle. The single spin polarization is teleported from the input qubit to the output qubit, with fidelity primarily limited by singlet-triplet mixing, which can be improved by optimizing the device parameters. These results may be extended to quantum algorithms with a larger number of semiconductor spin qubits.
NPJ QUANTUM INFORMATION
(2021)
Article
Physics, Multidisciplinary
Yotam Shapira, Sapir Cohen, Nitzan Akerman, Ady Stern, Roee Ozeri
Summary: In this study, we enhance the fidelity and robustness of entangling gates in quantum computers by introducing spin-dependent squeezing.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Yue Fu, Yang Wu, Yingqiu Dai, Xi Qin, Xing Rong, Jiangfeng Du
Summary: A new noise-spectrum analysis method without spurious harmonics has been developed and successfully applied to a molecular qubit with a complex spin bath composition. The method can resolve various nuclear spins in the spin bath, such as 1H, 31P, 13C, and 63Cu, which traditional noise-spectrum analysis cannot achieve. This approach may lead to improved quantum-control methods, enhanced material engineering, and increased coherence for molecular qubits.
PHYSICAL REVIEW APPLIED
(2021)
Article
Quantum Science & Technology
Pranav Kairon, Mukhtiyar Singh, Satyabrata Adhikari
Summary: This article presents a series of rigorous relations and inequalities regarding quantum coherence and entanglement, and discusses the possibility of experimental implementation.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Multidisciplinary Sciences
Shun Kanai, F. Joseph Heremans, Hosung Seo, Gary Wolfowicz, Christopher P. Anderson, Sean E. Sullivan, Mykyta Onizhuk, Giulia Galli, David D. Awschalom, Hideo Ohno
Summary: In this study, an algebraic expression for the quantum coherence time (T-2) of spin defect centers in host compounds is uncovered based on cluster correlation expansion (CCE) technique. By investigating over 12,000 host compounds, silicon carbide (SiC) is found to possess the longest coherence times among widegap nonchalcogenides, while more than 700 chalcogenides possess longer T-2 than SiC. Potential host compounds with promisingly long T-2 up to 47 ms are suggested, paving the way for exploring unprecedented functional materials for quantum applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Applied
Jelmer M. Boter, Juan P. Dehollain, Jeroen P. G. van Dijk, Yuanxing Xu, Toivo Hensgens, Richard Versluis, Henricus W. L. Naus, James S. Clarke, Menno Veldhorst, Fabio Sebastiano, Lieven M. K. Vandersypen
Summary: This article discusses a quantum-dot spin-qubit architecture that integrates on-chip control electronics, reducing the number of signal connections at the chip boundary. It presents a concrete floor plan and estimates the operation frequencies and power consumption of a million-qubit array. This work significantly closes the gap towards a fully CMOS-compatible quantum computer implementation.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Julian A. J. Fells, Patrick S. Salter, Chris Welch, Yihan Jin, Timothy D. Wilkinson, Martin J. Booth, Georg H. Mehl, Steve J. Elston, Stephen M. Morris
Summary: Dynamic time-resolved measurements of a multi-pixel analog liquid crystal phase modulator driven at a 1 kHz frame rate are presented. Using a heterodyne interferometer, two pixels can be interrogated independently and simultaneously, allowing for deconvolution of phase modulation with a wide bandwidth. The root mean squared optical phase error within a 30 Hz to 25 kHz bandwidth is <0.5 degrees and the crosstalk rejection is 50 dB. This technique is applicable to various types of optical phase modulators and spatial light modulators.
Article
Optics
Mohan Wang, Patrick S. Salter, Frank P. Payne, Adrian Shipley, Stephen M. Morris, Martin J. Booth, Julian A. J. Fells
Summary: This paper presents a novel design and laser writing technique for creating single-mode Bragg gratings in sapphire optical fibers. The resulting gratings have a narrow bandwidth and can withstand high temperatures, making them suitable for accurate sensing in extreme environments.
Article
Optics
Bangshan Sun, Fyodor Morozko, Patrick S. Salter, Simon Moser, Zhikai Pong, Raj B. Patel, Ian A. Walmsley, Mohan Wang, Adir Hazan, Nicolas Barre, Alexander Jesacher, Julian Fells, Chao He, Aviad Katiyi, Zhen-Nan Tian, Alina Karabchevsky, Martin J. Booth
Summary: This paper reports a new method for femtosecond laser writing of optical-fiber-compatible glass waveguides, which enables high precision and low loss control of waveguide cross-sections. The fabricated waveguides show high refractive index contrast, low propagation loss, and low coupling loss, and they can operate across a broad range of wavelengths.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Zhibo LI, Jack A. Smith, Mark Scullion, Nils Kolja Wessling, Loyd J. J. Mcknight, Martin D. Dawson, Michael J. J. Strain
Summary: This study demonstrates the first heterogeneous integration of pre-fabricated lithium niobate photonic waveguide devices onto a silicon nitride waveguide platform using a transfer-printing approach. The fabrication process developed allows the compatibility of free-standing lithium niobate membrane devices with back-end integration onto photonic integrated circuits.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Zimo Zhao, Bohan Chen, Patrick S. Salter, Martin J. Booth, Dominic O'Brien, Steve J. Elston, Stephen M. Morris
Summary: In this study, multi-element and multi-wavelength switchable Dammann gratings were fabricated using two-photon polymerization direct laser writing. The experiment demonstrated the potential of these switchable elements in programmable beam shaping, microscopy, and optical communication devices.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Optics
Christopher L. Panuski, Ian Christen, Momchil Minkov, Cole J. Brabec, Sivan Trajtenberg-Mills, Alexander D. Griffiths, Jonathan J. D. McKendry, Gerald L. Leake, Daniel J. Coleman, Cung Tran, Jeffrey St Louis, John Mucci, Cameron Horvath, Jocelyn N. Westwood-Bachman, Stefan F. Preble, Martin D. Dawson, Michael J. Strain, Michael L. Fanto, Dirk R. Englund
Summary: This study demonstrates the complete control of optical fields by using a programmable photonic crystal cavity array. The researchers achieved near-complete spatiotemporal control of a 64-resonator, two-dimensional spatial light modulator through the integration of four key advances, including high-fidelity coupling, scalable fabrication, precise resonance alignment, and out-of-plane cavity control. This work opens up new possibilities for programmability at the fundamental limits of multimode optical control.
Article
Materials Science, Multidisciplinary
Nils Kolja Wessling, Saptarsi Ghosh, Benoit Guilhabert, Menno Kappers, Alexander M. Hinz, Miles Toon, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: This paper demonstrates the back-end integration of optically broadband, high-NA GaN micro-lenses onto non-native semiconductor substrates through micro-assembly. A highly parallel process flow is developed to fabricate and suspend micron scale plano-convex lens platelets, which are then transferred and printed onto the substrates. Optical performance analysis shows the potential of these lenses for visible to infrared light-coupling applications, including coupling to diamond nitrogen vacancy centers at micron scale depths.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Jack A. Smith, Henry Francis, Gabriele Navickaite, Michael J. Strain
Summary: This article presents a high-performance silicon nitride photonic integrated circuit platform that operates at visible wavelengths and is accessible through the commercial foundry, LIGENTEC. The article measures propagation losses across the visible spectrum from 450 nm to 850 nm. For wavelengths above 630 nm, the losses are <1 dB/cm in TE and <0.5 dB/cm in TM. In addition, sets of single mode waveguide-coupled ring resonators across three separate chips were tested and analyzed. The article provides an analysis of the loss and coupling, considering the bus-ring coupling gap and waveguide width. High confinement, low loss devices based on chip-scale silicon nitride are becoming increasingly important for the next generation of integrated optical devices operating at visible wavelengths.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Quantum Science & Technology
Rainer Kaltenbaek, Markus Arndt, Markus Aspelmeyer, Peter F. Barker, Angelo Bassi, James Bateman, Alessio Belenchia, Joel Berge, Claus Braxmaier, Sougato Bose, Bruno Christophe, Garrett D. Cole, Catalina Curceanu, Animesh Datta, Maxime Debiossac, Uros Delic, Lajos Diosi, Andrew A. Geraci, Stefan Gerlich, Christine Guerlin, Gerald Hechenblaikner, Antoine Heidmann, Sven Herrmann, Klaus Hornberger, Ulrich Johann, Nikolai Kiesel, Claus Laemmerzahl, Thomas W. LeBrun, Gerard J. Milburn, James Millen, Makan Mohageg, David C. Moore, Gavin W. Morley, Stefan Nimmrichter, Lukas Novotny, Daniel K. L. Oi, Mauro Paternostro, C. Jess Riedel, Manuel Rodrigues, Loic Rondin, Albert Roura, Wolfgang P. Schleich, Thilo Schuldt, Benjamin A. Stickler, Hendrik Ulbricht, Christian Vogt, Lisa Woerner
Summary: The objective of MACRO mission is to conduct macroscopic quantum experiments in space to test the foundations of physics at the interface with gravity. Developing necessary technologies and achieving required sensitivities for macroscopic quantum systems in extreme conditions is crucial. Recent scientific advancements promise potential for accomplishing additional science objectives and drive the research campaign.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Graeme E. Johnstone, Johannes Herrnsdorf, Martin D. Dawson, Michael J. Strain
Summary: Challenging imaging applications that require ultra-short exposure times or imaging in photon-starved environments often have extremely low numbers of photons per pixel (<1 photon per pixel). To improve the image quality in such photon-sparse images, post-processing techniques, such as Bayesian retrodiction and bilateral filtering, can be used to estimate the number of photons detected and improve the spatial distributions in single-photon imaging applications. In this study, we demonstrate that at high frame rates (>1 MHz) and low incident photon flux (<1 photon per pixel), image post-processing techniques can provide better grayscale information and spatial fidelity of reconstructed images compared to simple frame averaging, with up to a 3-fold improvement in SSIM.
Article
Materials Science, Multidisciplinary
Eleni Margariti, Gemma Quinn, Dimitars Jevtics, Benoit Guilhabert, Martin D. Dawson, Michael J. Strain
Summary: A continuous, single shot roller transfer printing process is introduced for large-scale hybrid integration of semiconductor devices. It demonstrates transfer of a 320 x 240 pixel micro-LED array, with sub-micron relative position accuracy, representing over 75,000 individual devices in one shot. The transfer printing process maintains array geometry, with pixel spatial location error less than 1 & mu;m deviation from the as-designed layout. An automated sub-micron precision metrology system using simple optical microscopy is developed to assess device populations and yield.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Benoit Guilhabert, Sean P. Bommer, Nils K. Wessling, Dimitars Jevtics, Jack A. Smith, Zhongyi Xia, Saptarsi Ghosh, Menno Kappers, Ian M. Watson, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: Transfer printing technology has been widely used for integrating planar membrane devices on photonic and electronic circuits. This work introduces an advanced transfer print system that allows printing of optical devices in non-planar geometries and enables in-situ optical monitoring. The system demonstrates the printing of micro-resonators coupled to on-chip waveguides, inverted device printing, and the assembly of micro-cavities with semiconductor micro-lenses and nanowire lasers. Non-standard substrates such as optical chip facets and single-mode fibre ends are also successfully printed. The in-situ optical coupling through the transfer printing system enables real-time active alignment of the printed devices.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Jack A. Smith, Zhibo Li, Saprtarsi Ghosh, Henry Francis, Gabriele Navickaite, Loyd J. McKnight, Rachel A. Oliver, Martin D. Dawson, Michael J. Strain
Summary: Silicon nitride (Si3N4) is a high-performance material platform for visible wavelength photonic integrated circuits, especially for heterogeneous/hybrid integration of complementary materials. This work characterizes the performance of Si3N4 from LIGENTEC as a base for hybrid integration.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
Article
Materials Science, Multidisciplinary
B. D. Wood, G. A. Stimpson, J. E. March, Y. N. D. Lekhai, C. J. Stephen, B. L. Green, A. C. Frangeskou, L. Gines, S. Mandal, O. A. Williams, G. W. Morley
Summary: It has been found that using milling to fabricate nanodiamonds can result in NV-nanodiamonds with long spin coherence times, which is important for their applications as localized sensors in biological materials.
