Download or read book Coupling Between Quantum Dot Qubits and a Superconducting Microwave Resonator written by Cameron Eric King and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum computing has the potential to achieve better scaling for factoring large numbers, simulating quantum behavior of molecules, and sampling random number distributions. Quantum dot qubits in silicon show strong promise as a qubit platform due to the long decoherence times measured as well as the possibility of leveraging techniques from classical processor fabrication towards scaling to large qubit systems. We examine coupling quantum dot qubits to a superconducting coplanar waveguide, which functions as a single-photon resonator, and this system enables coherent communications between qubit systems. We are concerned with both the hardware and low-level software of quantum computation. We examine geometric modifications to the heterostructure and the electrode geometry to boost the capacitive coupling between a triple dot system and a resonator. We find decreasing the vertical separation between the electrode connected to the resonator and the dots has a positive impact on the coupling strength. Continuing hardware simulations, we consider the issue of low device yield in Si-MOS devices, where despite large singlet-triplet splittings, there was no evidence of Pauli spin blockade. We attributed this to impurities within the oxide and performed a series of simulations that allowed us to determine the required impurity density to lift spin blockade, and found this density consistent with the device yield. Switching to considering different qubit encodings, we compared and contrasted the behavior of three qubits that are resonantly coupled to a superconducting resonator. The three encodings were the charge dipole (CD) qubit, the charge quadrupole (CQ) qubit, and the quantum dot hybrid qubit (QDHQ). In terms of entangling a one photon state with a qubit state, the CD qubit and the CQ qubit behaved similarly, however the CQ qubit does allow arbitrary single qubit gates while being protected from quasistatic charge noise. The QDHQ exhibited better performance (measured by infidelity) when operated at a second-order-sweet spot than both other encodings in the typical charge noise regime. Furthermore, the quantum dot hybrid qubit enables multiple operating points, offering greater tuning flexibility when considering implementation in actual devices.
Download or read book Development of a Silicon Semiconductor Quantum Dot Qubit with Dispersive Microwave Readout written by Edward Trowbridge Henry and published by . This book was released on 2013 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor quantum dots in silicon demonstrate exceptionally long spin lifetimes as qubits and are therefore promising candidates for quantum information processing. However, control and readout techniques for these devices have thus far employed low frequency electrons, in contrast to high speed temperature readout techniques used in other qubit architectures, and coupling between multiple quantum dot qubits has not been satisfactorily addressed. This dissertation presents the design and characterization of a semiconductor charge qubit based on double quantum dot in silicon with an integrated microwave resonator for control and readout. The 6 GHz resonator is designed to achieve strong coupling with the quantum dot qubit, allowing the use of circuit QED control and readout techniques which have not previously been applicable to semiconductor qubits. To achieve this coupling, this document demonstrates successful operation of a novel silicon double quantum dot design with a single active metallic layer and a coplanar stripline resonator with a bias tee for dc excitation. Experiments presented here demonstrate quantum localization and measurement of both electrons on the quantum dot and photons in the resonator. Further, it is shown that the resonator-qubit coupling in these devices is sufficient to reach the strong coupling regime of circuit QED. The details of a measurement setup capable of performing simultaneous low noise measurements of the resonator and quantum dot structure are also presented here. The ultimate aim of this research is to integrate the long coherence times observed in electron spins in silicon with the sophisticated readout architectures available in circuit QED based quantum information systems. This would allow superconducting qubits to be coupled directly to semiconductor qubits to create hybrid quantum systems with separate quantum memory and processing components.
Download or read book Quantum Dot Optoelectronic Devices written by Peng Yu and published by Springer Nature. This book was released on 2020-04-16 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book captures cutting-edge research in semiconductor quantum dot devices, discussing preparation methods and properties, and providing a comprehensive overview of their optoelectronic applications. Quantum dots (QDs), with particle sizes in the nanometer range, have unique electronic and optical properties. They have the potential to open an avenue for next-generation optoelectronic methods and devices, such as lasers, biomarker assays, field effect transistors, LEDs, photodetectors, and solar concentrators. By bringing together leaders in the various application areas, this book is both a comprehensive introduction to different kinds of QDs with unique physical properties as well as their preparation routes, and a platform for knowledge sharing and dissemination of the latest advances in a novel area of nanotechnology.
Download or read book Interaction Between Quantum Dots and Superconducting Microwave Resonators written by Tobias Sebastian Frey and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detection and Interaction of Single Quantum States written by Sishen Xie and published by Springer Nature. This book was released on 2023-07-25 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the findings and achievements in the major research plan “Detection and Interaction of Single Quantum States” funded by the National Natural Science Foundation of China (NSFC). The 8-year plan started in 2011 and consisted of 107 projects conducted by Chinese universities and research institutes. The book covers the plan's research background, achievements, and follow-up prospects. The plan aimed to tackle one of the major challenges for researchers worldwide—to establish precise detection and control of single quantum states in time, space, energy, and momentum. The plan integrated precise detection means with the ultrahigh resolution of time, space, and energy, under extreme conditions such as ultrahigh vacuum, ultralow temperature, high magnetic field, and ultrahigh pressure, using interdisciplinary research methods in physics, chemistry, informatics, and materials science. The book focuses on the exploration of new phenomena, theories, and concepts of single quantum states, describes new techniques and methods of single quantum states, and presents the purification and construction of single-quantum-state systems. It is a concise and valuable source of information for researchers in quantum science and graduate students interested in the research field.
Download or read book Quantum circuits based on artificial magnetic molecules written by Ignacio Gimeno Alonso and published by Prensas de la Universidad de Zaragoza. This book was released on 2023-03-27 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autor: Ignacio Gimeno Alonso Colección: Colección Estudios de Física. CEF-158 Richard Feynman was the first to propose the idea of applying the laws of quantum physics to perform computational tasks in 1982. David Deutsch then generalised the notion of a Turing machine to the quantum realm, in-troducing the notion of a universal quantum computer. In this system, the bit (the classical unit of information) is replaced by the quantum bit or qubit. The quantum superposition principle allows the qubit to be in any superposition state a |0⟩ + b |1⟩, instead of being in just one of the two states 0 or 1 as a classical bit. This "quantum parallelism" is the key property of a quantum computer, which provides access to an exponentially larger set of states to process information. It makes it possible to simulate quantum systems that classical computers cannot afford due to their size. It could also solve new tasks, as creating true random numbers, and improve others such as the database searching, and prime number factorisation.
Download or read book Quantum Computing written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-04-27 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum mechanics, the subfield of physics that describes the behavior of very small (quantum) particles, provides the basis for a new paradigm of computing. First proposed in the 1980s as a way to improve computational modeling of quantum systems, the field of quantum computing has recently garnered significant attention due to progress in building small-scale devices. However, significant technical advances will be required before a large-scale, practical quantum computer can be achieved. Quantum Computing: Progress and Prospects provides an introduction to the field, including the unique characteristics and constraints of the technology, and assesses the feasibility and implications of creating a functional quantum computer capable of addressing real-world problems. This report considers hardware and software requirements, quantum algorithms, drivers of advances in quantum computing and quantum devices, benchmarks associated with relevant use cases, the time and resources required, and how to assess the probability of success.
Download or read book Coupling Quantum Dot Circuits to Microwave Cavities written by Matthieu Delbecq and published by . This book was released on 2012 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum dot circuits (qd) in a circuit cavity quantum electrodynamics (cqed) architecture. the interest of such hybrid systems lies in the light-matter interaction that occurs between the cavity microwave photons and the electrons of the qd. in this thesis work, carbon nanotubes have been chosen as the material for the qds. indeed, it is possible to observe various electronic transport regimes in such systems (fabry-perot, coulomb blockade and kondo). their versatility is also a keypoint as it is possible to contact them with various type of metal electrodes (normal, superconductor, ferromagnetic metal). the experimental realization of such devices has the project of this thesis was to experimentally realize the implementation of shown an electron-photon coupling of the order of 100mhz, comparable to standard cqed couplings. this coupling is tunable by purely electric control. finally, wehave demonstrated the distant interaction between two qds, separated by 80μm, via the microwave cavity photons. these results shows that these devices can be used for manipulating the quantum information as well as for simulate on-chip condensed matter situations. we have therefore been able to measure the quantum capacitance of the qds, and in particular in the kondo regime. we have also simulated the electron-phonon polaronic shift in the case of the distant interaction between the two qds.
Download or read book Spin Qubits in Photon coupled Microwave Cavities written by Samuel Thomas Johnson and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron spin qubits in microwave cavities represent a promising foundation for developing quantum computing hardware. Electron spin states have high coherence times compared to gate interaction time scales, and photon coupling allows for long-distance interaction between qubits. The strong spin-photon coupling regime can be realized via the dipole interaction, as Petta et al. [1] demonstrated by placing an electron in a double quantum dot (DQD) with a magnetic field gradient inside a microwave cavity. These studies later included two DQDs inside the cavity to demonstrate long-range spin-spin interactions [2]. Input-output theory describes the system's behavior when driven by an external field and determines the internal qubit states from the transmission amplitude of the output field [3]. The scaling strategy for this system that has been considered thus far by others has involved placing multiple qubits inside of a single cavity. As an alternative setup, we analyze results from a model of a double DQD qubit system consisting of two cavities, each containing one qubit, coupled via a capacitive coupler that allows for single photon exchange. In analogy with previous works, we utilize input-output theory to obtain transmission amplitudes and discuss the various regimes determined by tuning different parameters
Download or read book Microwave Techniques in Superconducting Quantum Computers written by Alan Salari and published by Artech House. This book was released on 2024-01-31 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first of its kind, Microwave Techniques in Superconducting Quantum Computers introduces microwave and quantum engineers to essential practical techniques and theoretical foundations crucial for operating and implementing hardware in superconducting quantum processors. This practical resource covers an extensive range of topics, including Introduction to Quantum Physics, Introduction to Quantum Computing, Superconducting Qubits, Microwave Systems, Microwave Components, Principles of Electromagnetic Compatibility, Control Hardware for Superconducting Qubits, and Principles of Cryogenics. Such technical knowledge equips the reader with essential skills to succeed in the demanding industries and research settings surrounding quantum technologies. With clearly outlined learning objectives and coherent explanations of intricate concepts, this is a must-have reference for a wide spectrum of professionals, including microwave and quantum engineers, technical managers, technical sales engineers in quantum computing and microwave companies, as well as newcomers entering this field. To enrich the reader's experience, this book offers additional complementary content accessible via www.quaxys.com/book.
Download or read book Quantum Information written by Dagmar Bruss and published by John Wiley & Sons. This book was released on 2019-01-30 with total page 1600 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive textbook on the rapidly advancing field introduces readers to the fundamental concepts of information theory and quantum entanglement, taking into account the current state of research and development. It thus covers all current concepts in quantum computing, both theoretical and experimental, before moving on to the latest implementations of quantum computing and communication protocols. It contains problems and exercises and is therefore ideally suited for students and lecturers in physics and informatics, as well as experimental and theoretical physicists in academia and industry who work in the field of quantum information processing. The second edition incorporates important recent developments such as quantum metrology, quantum correlations beyond entanglement, and advances in quantum computing with solid state devices.
Download or read book Quantum Transport in a Correlated Nanostructure Coupled to a Microwave Cavity written by Olesia Dmytruk and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we study theoretically various physical properties of nanostructures that are coupledto microwave cavities. Cavity quantum electrodynamics (QED) with a quantum dot has been proven to be a powerful experimental technique that allows to study the latter by photonic measurements in addition to electronic transport measurements. In this thesis, we propose to use the cavity microwave field to extract additional information on the properties of quantum conductors: optical transmission coefficient gives direct access to electronic susceptibilities of these quantum conductors. We apply this general framework to different mesoscopic systems coupled to a superconducting microwave cavity, such as a tunnel junction, a quantum dot coupled to the leads, a topological wire and a superconducting ring. Cavity QED can be used to probe the finite frequency admittance of the quantum dot coupled to the microwave cavity via photonic measurements. Concerning the topological wire, we found that the cavity allows for determining the topological phase transition, the emergence of Majorana fermions, and also the parity of the ground state. For the superconducting ring, we propose to study the Josephson effect and the transition from the latter to the fractional Josephson effect, which is associated with the emergence of the Majorana fermions in the system, via the optical response of the cavity. The proposed framework allows to probe a broad range of nanostructures, including quantum dots and topological superconductors, in a non-invasive manner. Furthermore, it gives new information on the properties of these quantum conductors, which was not available in transport experiments.
Download or read book Integrated Silicon Metal Systems at the Nanoscale written by Munir H. Nayfeh and published by Elsevier. This book was released on 2023-04-12 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated Silicon-Metal Systems at the Nanoscale: Applications in Photonics, Quantum Computing, Networking, and Internet is a comprehensive guide to the interaction, materials and functional integration at the nanoscale of the silicon-metal binary system and a variety of emerging and next-generation advanced device applications, from energy and electronics, to sensing, quantum computing and quantum internet networks. The book guides the readers through advanced techniques and etching processes, combining underlying principles, materials science, design, and operation of metal-Si nanodevices. Each chapter focuses on a specific use of integrated metal-silicon nanostructures, including storage and resistive next-generation nano memory and transistors, photo and molecular sensing, harvest and storage device electrodes, phosphor light converters, and hydrogen fuel cells, as well as future application areas, such as spin transistors, quantum computing, hybrid quantum devices, and quantum engineering, networking, and internet. - Provides detailed coverage of materials, design and operation of metal-Si nanodevices - Offers a step-by-step approach, supported by principles, methods, illustrations and equations - Explores a range of cutting-edge emerging applications across electronics, sensing and quantum computing
Download or read book Superconducting Devices in Quantum Optics written by Robert Hadfield and published by Springer. This book was released on 2016-02-29 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the basics and applications of superconducting devices in quantum optics. Over the past decade, superconducting devices have risen to prominence in the arena of quantum optics and quantum information processing. Superconducting detectors provide unparalleled performance for the detection of infrared photons in quantum cryptography, enable fundamental advances in quantum optics, and provide a direct route to on-chip optical quantum information processing. Superconducting circuits based on Josephson junctions provide a blueprint for scalable quantum information processing as well as opening up a new regime for quantum optics at microwave wavelengths. The new field of quantum acoustics allows the state of a superconducting qubit to be transmitted as a phonon excitation. This volume, edited by two leading researchers, provides a timely compilation of contributions from top groups worldwide across this dynamic field, anticipating future advances in this domain.
Download or read book Quantum Information 2 Volume Set written by Dagmar Bruss and published by John Wiley & Sons. This book was released on 2019-06-10 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive textbook on the rapidly advancing field introduces readers to the fundamental concepts of information theory and quantum entanglement, taking into account the current state of research and development. It thus covers all current concepts in quantum computing, both theoretical and experimental, before moving on to the latest implementations of quantum computing and communication protocols. It contains problems and exercises and is therefore ideally suited for students and lecturers in physics and informatics, as well as experimental and theoretical physicists in academia and industry who work in the field of quantum information processing. The second edition incorporates important recent developments such as quantum metrology, quantum correlations beyond entanglement, and advances in quantum computing with solid state devices.
Download or read book Long range Coupling of Electron Spins written by Felix Frederic Leonhard Borjans and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the quest towards harnessing quantum systems to study quantum physical phenomena and eventually build a universal quantum computer, multiple promising platforms have emerged. Vast progress has been made on the circuit quantum electrodynamics (cQED) platform, where superconducting quantum bits (qubits) are already being used in networks of beyond 50. Another favored implementation is the spin of a single electron. While it is challenging to control due to its weak interactions with the environment, that property is a promising ingredient for long-lived and coherent qubits. Uniting these two platforms has the potential for a powerful symbiosis, combining the long-range networking via microwave photons with the coherence of a single electron spin.In this thesis, we build upon first demonstrations of coherent coupling between individual electron spins with microwave photons. In this coupling approach, the electron is trapped inside a double quantum dot (DQD) and subjected to a strong magnetic field gradient, which enables coupling of the spin to the electric field of a superconducting resonator. We extend this hybrid cQED architecture by a new coupling approach that allows for scalable access to charge-photon coupling while retaining its coupling strength. We then utilize this architecture to demonstrate resonant long-distance coupling between two spins and a cavity photon across a distance of over 4 mm. This first link between two separated spins improves the range of interaction between two spins by more than 4 orders of magnitude compared to usual exchange based approaches with 100 nm length scales.We scale the architecture from using DQDs to triple quantum dots (TQDs) and study the valley states in the array. Using the high-resolution readout of the coupled resonator, we extract the inter-valley coupling elements between neighboring quantum dots, studying the complex-valued nature of the valley states. This new insight into the state landscape of electrons in silicon quantum dots can help feed back into substrate fabrication efforts and shed light onto interdot dynamics that also occur in quantum dot arrays without a cavity sensor. Finally, we utilize a cavity-coupled TQD to perform high-fidelity spin readout via a flexible gate-sensing approach.
Download or read book Journal of the Physical Society of Japan written by and published by . This book was released on 2013 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:
