Article
Quantum Science & Technology
Lionel Tenemeza Kenfack, William Degaulle Waladi Gueagni, Martin Tchoffo, Lukong Cornelius Fai
Summary: The estimation of temperature in a thermal XY spin-chain can be improved by adjusting the coupling strength between the probe and the bath as well as the bath spins. Optimal precision is achieved when these coupling strengths are equal, allowing for a long-time interaction between the probe and the bath.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Romain Debroux, Cathryn P. Michaels, Carola M. Purser, Noel Wan, Matthew E. Trusheim, Jesus Arjona Martinez, Ryan A. Parker, Alexander M. Stramma, Kevin C. Chen, Lorenzo de Santis, Evgeny M. Alexeev, Andrea C. Ferrari, Dirk Englund, Dorian A. Gangloff, Mete Atature
Summary: The study demonstrates multi-axis coherent control of the SnV spin qubit through all-optical stimulated Raman drive, confirming its coherent access and revealing spin dephasing time and spin coherence time. By integrating SnV into photonic nanostructures, it becomes a competitive spin-photon building block for quantum networks.
Article
Physics, Fluids & Plasmas
Sagnik Chakraborty, Arpan Das, Dariusz Chruscinski
Summary: We discuss a model of closed quantum evolution of two qubits, where one qubit acts as a bath and thermalizes the other qubit acting as the system. The exact master equation for the system is derived, and interestingly, it takes the Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) form, with constant coefficients representing pumping and damping of a single qubit system. Based on this model, we construct an Otto cycle connected to a single qubit bath and study its thermodynamic properties, including effects of finite baths and non-Markovianity. We find closed form expressions for efficiency, power, and different modifications of the joint Hamiltonian.
Article
Multidisciplinary Sciences
J. M. Kitzman, J. R. Lane, C. Undershute, P. M. Harrington, N. R. Beysengulov, C. A. Mikolas, K. W. Murch, J. Pollanen
Summary: This article investigates a new platform for studying open quantum systems by coupling superconducting qubits with piezoelectric surface acoustic wave phonons. By shaping the loss spectrum of the qubit through the bath of lossy surface phonons, the researchers demonstrate the preparation and dynamical stabilization of superposition states through drive and dissipation. These experiments highlight the versatility of engineered phononic dissipation and advance the understanding of mechanical losses in superconducting qubit systems.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Paul C. Jerger, Yu-Xin Wang, Mykyta Onizhuk, Benjamin S. Soloway, Michael T. Solomon, Christopher Egerstrom, F. Joseph Heremans, Giulia Galli, Aashish A. Clerk, David D. Awschalom
Summary: Single-qubit sensing protocols can measure qubit-bath coupling parameters. However, the sensing protocol itself can perturb the bath, causing a quantum quench effect. This study observed the bath perturbation in a nitrogen-vacancy (NV) center by measuring the phase-resolved spin-echo of the nuclear spin bath. The relationship between the sensor phase and the Gaussian spin-bath polarization was derived to optimize the transfer efficiency of the dynamic nuclear polarization sequence.
Article
Materials Science, Multidisciplinary
Irina Heinz, Guido Burkard
Summary: The study focuses on crosstalk effects between neighboring qubits in quantum bit systems, proposing conditions for synchronizing Rabi oscillations and avoiding crosstalk, and analyzing the limitations on gate time and parameters due to crosstalk between two neighbors. Ultimately, a set of parameter values for achieving a nearly crosstalk-free CNOT gate is suggested, paving the way for scalable quantum computing devices.
Article
Optics
Federico Roccati, Salvatore Lorenzo, Giuseppe Calajo, G. Massimo Palma, Angelo Carollo, Francesco Ciccarello
Summary: Photon-mediated interaction between quantum emitters is an emerging field in quantum optics. Non-Hermitian physics, particularly in photonic lattices, challenges conventional theories and allows access to new physics. The study reveals that structured losses in the field can lead to exotic emission properties. Photons can mediate dissipative, fully non-reciprocal interactions between emitters, with the range depending on the loss rate.
Article
Physics, Multidisciplinary
Wentian Zheng, Ke Bian, Xiakun Chen, Yang Shen, Shichen Zhang, Rainer Stohr, Andrej Denisenko, Jorg Wrachtrup, Sen Yang, Ying Jiang
Summary: An efficient method was developed to engineer the electrostatic environment of near-surface nitrogen vacancy center qubits, increasing their coherence and sensitivity.
Article
Chemistry, Multidisciplinary
Rahul Sawant, Anna Maffei, Giovanni Barontini
Summary: The study shows that by interacting with a thermal bath of ultracold atoms, a trapped single atom can reach thermal equilibrium and be cooled. Monte Carlo simulations demonstrate the feasibility of using this method within experimental limitations to achieve cooling of the trapped atom.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Multidisciplinary
Qing Wang, Zheng-Rong Zhu, Jian Zou, Bin Shao
Summary: The orthogonality catastrophe (OC) of quantum many-body systems is an important phenomenon in condensed matter physics. A recent study found an interesting relationship between the OC and the quantum speed limit (QSL). Inspired by this, the researchers proposed a quantitative version of the quantum average speed as another method to investigate the measure of how close it is to the OC dynamics. Through analyzing the properties of an impurity qubit embedded into an isotropic Lipkin-Meshkov-Glick spin model, they showed that the OC dynamics can also be characterized by the average speed of the evolution state. Furthermore, they demonstrated a similar behavior between the actual speed of quantum evolution and the theoretical maximal rate, which provides an alternative speed-up protocol to understand some universal properties characterized by the QSL.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Peng Fan, Ning-Hua Tong, Zhen-Gang Zhu
Summary: The study reveals that the results qualitatively agree with the density matrix renormalization group in the case of spin-unpolarized electrons; while for partially spin-polarized systems, oscillations in the SSCF envelope appear due to the beating of two spin-split Fermi surfaces. Additionally, an increase in bath spin polarization leads to the emergence of a characteristic bump in the integrated SSCF curve.
Article
Physics, Multidisciplinary
Lionel Tenemeza Kenfack, William Degaulle Waladi Gueagni, Martin Tchoffo, Lukong Cornelius Fai
Summary: The thermometry of a thermal spins bath using two qubits was investigated, with the precision evaluated using quantum Fisher information and quantum signal-to-noise ratio. It was found that product states consistently provide the largest estimation precision compared to entangled Bell states, regardless of short- or long-time interactions.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Chemistry, Multidisciplinary
Xiaonan Zhao, Yanan Dong, Weibin Chen, Xuejie Xie, Lihui Bai, Yanxue Chen, Shishou Kang, Shishen Yan, Yufeng Tian
Summary: This study demonstrates the realization of all 16 Boolean logic functions through purely electrical manipulation in a Pt/IrMn/Co/Ru/CoPt heterojunction, achieving internal spin logic. This research is a significant step towards practical electrical programmable spin logic devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Applied
Y. N. Dong, X. N. Zhao, X. Han, Y. B. Fan, X. J. Xie, Y. X. Chen, L. H. Bai, Y. Y. Dai, S. S. Yan, Y. F. Tian
Summary: The study demonstrates the realization of all 16 Boolean logic functions within a single four-state nonvolatile magnetic heterojunction, utilizing controllable field-free spin-orbit torque switching. By assigning different values to four variables of the four-state memory, the complete Boolean logic functions are achieved in three steps.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
W. Pogosov, A. Yu Dmitriev, O. Astafiev
Summary: Theoretical analysis of wave mixing under the irradiation of a single qubit by two photon fields is presented in this study. When classical and nonclassical photon fields are mixed, side peaks due to elastic multiphoton scattering arise, with some peaks being absent. The analysis of peak amplitudes can provide insights into probing photon statistics in the nonclassical mode.
Article
Physics, Condensed Matter
Natalia Alyabyeva, Jacques Ding, Mylene Sauty, Judith Woerle, Yann Jousseaume, Gabriel Ferro, Jeffrey C. McCallum, Jacques Peretti, Brett C. Johnson, Alistair C. H. Rowe
Summary: Scanning tunneling luminescence microscopy (STLM) and scanning tunneling spectroscopy (STS) were used to study step-bunched, oxidized 4H-SiC surfaces. It was found that the risers on the surface contain a higher density of surface charge traps and exhibit intense sub-gap light emission.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Brett C. Johnson, Michael Stuiber, Daniel L. Creedon, Manjith Bose, Amanuel Berhane, Laurens Henry Willems van Beveren, Sergey Rubanov, Jared H. Cole, Vincent Mourik, Alexander R. Hamilton, Timothy L. Duty, Jeffrey Colin McCallum
Summary: The development of devices with both superconducting and semiconducting properties is crucial for emerging quantum technologies. This study investigates superconducting nanowires made on a silicon-on-insulator (SOI) platform. The interdiffusion of aluminum and silicon along the entire length of the nanowire is observed, even at temperatures much lower than the Al-Si eutectic temperature. The phase-transformed material matches the predefined device patterns. The superconducting properties of a transformed mesoscopic ring on the SOI platform are also examined, and quantized low-temperature magnetoresistance oscillations in units of the fluxoid, h/2e, are observed.
Article
Physics, Applied
Ian R. Berkman, Alexey Lyasota, Gabriele G. de Boo, John G. Bartholomew, Brett C. Johnson, Jeffrey C. McCallum, Bin-Bin Xu, Shouyi Xie, Rose L. Ahlefeldt, Matthew J. Sellars, Chunming Yin, Sven Rogge
Summary: We propose a flexible method for studying the optical properties of an Er3+ ensemble in Si through resonant excitation and in situ single-photon detection. This technique allows efficient detection of optically active centers in transparent crystals without nanofabrication. We observe 70 Er3+ resonances in Si, with 62 of them not previously observed, indicating the potential of Er3+ in Si as a quantum information candidate.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Shifan Wang, Arun Ashokan, Sivacarendran Balendhran, Wei Yan, Brett C. Johnson, Alberto Peruzzo, Kenneth B. Crozier, Paul Mulvaney, James Bullock
Summary: In this study, a bias-selectable dual-band IR detector operating at room temperature was demonstrated using lead sulfide colloidal quantum dots and black phosphorus nanosheets. By switching between zero and forward bias, the peak photosensitive range of the detector can be switched between the mid- and short-wave IR bands, with room temperature detectivities of 5 x 10(9) and 1.6 x 10(11) cm Hz(1/2) W-1, respectively. These are the highest reported room temperature values for low-dimensional material dual-band IR detectors to date.
Article
Physics, Applied
C. T. -K. Lew, V. K. Sewani, N. Iwamoto, T. Ohshima, J. C. Mccallum, B. C. Johnson
Summary: Spin defects in solid-state sensors are investigated for their magnetic sensitivity, with potential applications in various industries. The study utilizes a silicon carbide pn-junction diode to detect a spin defect ensemble and enhance the baseline sensitivity through the hyperfine-induced spin-mixing effect observed at zero magnetic field. Additional electron-hole pairs are generated through above bandgap optical excitation, and a balanced detection scheme is implemented to reject common-mode noise, achieving an ultimate sensitivity of 30 nT/root Hz. Both techniques greatly enhance the magnetic sensitivity of the device by a total factor of approximately 24, paving the way for sub-nanotesla magnetic field sensitivities with electrical detection.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ik Kyeong Jin, Krittika Kumar, Matthew J. Rendell, Jonathan Yue Huang, Chris C. Escott, Fay E. Hudson, Wee Han Lim, Andrew S. Dzurak, Alexander R. Hamilton, Scott D. Liles
Summary: Holes in silicon quantum dots are explored for their potential as high-speed, customizable, and scalable qubits in semiconductor quantum circuits. Challenges include difficulties in charge sensing and controlling coupling between adjacent dots. A solution is presented with the fabrication of an ambipolar complementary metal-oxide-semiconductor (CMOS) device using multilayer palladium gates. The device includes an electron charge sensor and a hole double quantum dot, enabling control of spin state and smooth interdot coupling control. The results demonstrate improvements in hole spin-qubits' quality and controllability.
Article
Chemistry, Multidisciplinary
Sounak Mukherjee, Zi-Huai Zhang, Daniel G. Oblinsky, Mitchell O. de Vries, Brett C. Johnson, Brant C. Gibson, Edwin L. H. Mayes, Andrew M. Edmonds, Nicola Palmer, Matthew L. Markham, Adam Gali, Gergo Thiering, Adam Dalis, Timothy Dumm, Gregory D. Scholes, Alastair Stacey, Philipp Reineck, Nathalie P. de Leon
Summary: Color centers in diamond have potential applications in quantum technologies. We discovered a new color center in silicon-doped diamond that emits in the telecom O-band, which is compatible with long-distance fiber communication. The color center exhibits a long excited state lifetime and a possible intersystem crossing to another spin manifold.
Article
Energy & Fuels
Jesus Ibarra Michel, Di Yan, Sieu Pheng Phang, Tian Zheng, Brett C. Johnson, Jie Yang, Xinyu Zhang, Wenhao Chen, Yimao Wan, Thien Truong, Josua Stuckelberger, Yida Pan, Daniel Macdonald, James Bullock
Summary: Poly-Si passivating contacts based on polycrystalline silicon are a promising technology for high-efficiency crystalline silicon solar cells. This study compares the performance of phosphorous doped poly-Si contacts fabricated from different industry-compatible silicon films and a spin-on-dopant process. The study finds that larger grain size in the poly-Si films correlates with lower contact recombination and resistivity.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Multidisciplinary Sciences
Wyatt Vine, Mykhailo Savytskyi, Arjen Vaartjes, Anders Kringhoj, Daniel Parker, James Slack-Smith, Thomas Schenkel, Klaus Molmer, Jeffrey C. McCallum, Brett C. Johnson, Andrea Morello, Jarryd J. Pla
Summary: The sensitivity of pulsed electron spin resonance (ESR) measurements has been greatly enhanced by using superconducting microresonators and quantum-limited Josephson parametric amplifiers, achieving an improvement of more than four orders of magnitude. Incompatibility between Josephson junction-based devices and magnetic fields has resulted in the design of separate microwave resonators and amplifiers, leading to complex spectrometers and technical barriers. However, by coupling an ensemble of spins directly to a weakly nonlinear and magnetic field-resilient superconducting microwave resonator, this issue is circumvented. Pulsed ESR measurements with amplification within the device are successfully performed, demonstrating a high sensitivity and potential for application under conventional ESR operating conditions.
Article
Multidisciplinary Sciences
Rostyslav Savytskyy, Tim Botzem, Irene Fernandez de Fuentes, Benjamin Joecker, Jarryd J. Pla, Fay E. Hudson, Kohei M. Itoh, Alexander M. Jakob, Brett C. Johnson, David N. Jamieson, Andrew S. Dzurak, Andrea Morello
Summary: The spins of atoms and atom-like systems, which store quantum information, can now be controlled using local electric fields without the need for oscillating magnetic fields. This breakthrough was achieved by operating a single-atom flip-flop qubit in silicon, where quantum information is encoded in the electron-nuclear states of a phosphorus donor. This method, which modulates the electron-nuclear hyperfine coupling, can be extended to other atomic and molecular systems and enable the hyperpolarization of nuclear spin ensembles.
Article
Physics, Applied
C. t. -k. Lew, V. K. Sewani, T. Ohshima, J. C. McCallum, B. C. Johnson
Summary: Silicon carbide (SiC) power devices are crucial in high voltage electronics, but defects at interfaces and in the bulk affect their reliability and performance. This study presents a charge pumping method to characterize SiC/SiO 2 interface defects in commercial SiC power metal-oxide-semiconductor field-effect transistors (MOSFETs). The method is also used to investigate spin states at the SiC/SiO 2 interface through charge pumping electrically detected magnetic resonance (CP-EDMR).
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
B. Voisin, J. Salfi, D. D. St Medar, B. C. Johnson, J. C. McCallum, M. Y. Simmons, S. Rogge
Summary: A scanning tunnelling microscope can be used to perform spatially resolved wavefunction spectroscopy and local gate control of a quantum dot device consisting of phosphorus atoms in silicon. This solid-state quantum microscope is capable of controlling and locally probing the wavefunctions of atomic quantum dots in silicon. The microscope is constructed with a scanning tunnelling microscope tip, source and gate electrodes defined on an insulating silicon substrate, and uses a light-assisted method to switch between conductive and insulating states for stable positioning and local gating.
NATURE ELECTRONICS
(2023)