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Showing 1 to 20 of 53 for “"quantum circuits"”.
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Design Methods for Reliable Quantum Circuits
Quantum computing is an emerging technology that has the potential to change the perspectives and applications of computing in general. A wide range of applications are enabled: from faster algorithmic solutions of classically still difficult problems to theoretically more secure communication …
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The synthesis of nearest neighbour compliant quantum circuits
Quantum computers are reaching the size necessary to begin to perform useful tasks, however they are still limited by noise. One source of this noise is the error rate of the physical gates the processor uses. This means that when compiling high level quantum programs into executable code, it is …
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Sources of noise in niobium-based superconducting quantum circuits
Quantum computation is a fascinating field that combines novel physics with improvements in computation times and has been rapidly growing in the past few years. Using superconductors to form the qubits has the potential for large-scale computing, if the decoherence inherent in these devices can be …
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Probing Local Many-Body Dynamics with Random Quantum Circuits
Random quantum circuits are an attractive model for the behavior of complex many-body physics, due to their analytic tractability as well as ability to reproduce the behavior of chaotic quantum systems. Recent progress in elucidating their structure has led to an improved understanding of quantum …
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Electromagnetically Induced Transparency and electron spin dynamics using superconducting quantum circuits
… is an exploration on superconducting devices, quantum optics, and magnetic resonance. Superconductive quantum circuits (SQC) comprising mesoscopic Josephson junctions can exhibit quantum coherence amongst their macroscopically large degrees of freedom. They feature quantized flux and/or charge …
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Growth of titanium-nitride thin films for low-loss superconducting quantum circuits
… beam epitaxy (MBE) for applications in low loss quantum circuits. Titanium nitride is a material known to have low loss at microwave frequencies which sees practical use in many emerging quantum device architectures. The goal of this research is to investigate improvements in TiN thin films …
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Lower bounds on the classical simulation of quantum circuits for quantum supremacy
… progress, no task has yet been performed on quantum technology that could not also have been performed quickly on today's classical computers. One proposed path toward achieving this milestone, which is often referred to as quantum supremacy, is to perform specific types of quantum circuits …
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Tensor network approaches to open quantum systems, higher dimensional lattices and random quantum circuits
This Dissertation was approved for publication on 2024-08-27 at 15:07.
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Scalable Quantum Compilation Approaches For Reliable Quantum Computing
<p>Quantum computing has the potential to revolutionize various industries, from pharmaceuticals to finance and transportation. Unlike classical computers, quantum computers are based on the principles of quantum mechanics and can perform specific calculations exponentially faster than classical …
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Topics in Computing with Quantum Oracles and Higher-Dimensional Many-Body Systems
Since they were first envisioned, quantum computers have oft been portrayed as devices of limitless power, able to perform calculations in a mere instant that would take current computers years to determine. This is, of course, not the case. A huge amount of effort has been invested in trying to …
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Computation in models inspired by near-term quantum devices
The race is on to build the first quantum computer, and although there are many groups working towards this goal, their quantum devices have certain architectural properties in common. First, the devices tend to be built on qubits arranged in a 2D grid, with gates between neighboring qubits. …
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Quantum Simulation of Many-body Systems with Superconducting Qubits
The study of interacting many-body quantum systems is central to the understanding of wide a range of physical phenomena in condensed-matter systems, quantum gravity, and quantum circuits. However, quantum systems are often hard to study analytically, and the classical computing resources required …
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Local Hamiltonians in quantum computation
… I investigate aspects of local Hamiltonians in quantum computing. First, I focus on the Adiabatic Quantum Computing model, based on evolution with a time- dependent Hamiltonian. I show that to succeed using AQC, the Hamiltonian involved must have local structure, which leads to a result about …
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Optimizing Quantum Circuit Layout using Quantum Annealing
Quantum computing has garnered significant interest due to its theoretical potential for exponential speedup in computations. This advantage arises from the unique properties of quantum mechanics, which enable quantum bits (qubits) to exist in multiple states simultaneously and to become entangled. …
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TENSOR NETWORKS FOR OPEN QUANTUM SYSTEMS
Is it possible to efficiently simulate a quantum physical system on a classical computer? The computational resources needed to manipulate quantum many-body states typically scale exponentially in the number of their constituents, making the simulation very difficult or outright impossible even at …
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Numerical Synthesis of Arbitrary Multi-Qubit Unitaries with low 𝑇-Count
Quantum gate synthesis based on numerical optimization produces efficient circuits for NISQ (Noisy Intermediate-Scale Quantum) computing by minimizing the num- ber of two-qubit gates. The requirements for fault tolerant quantum computing are significantly different in that some single qubit gates …
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Development of SiOxNy waveguides for integrated quantum photonics
The development of integrated quantum photonics is integral to many areas of quantum information science, in particular linear optical quantum computing. In this context, a diversity of physical systems is being explored and thus versatility and adaptability are important prerequisites for any …
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Practical Modern Quantum Programming
… we present a compiler for Cavy, an imperative quantum programming language. The main contribution of the Cavy system is the application of region inference to the problem of safe and efficient ancilla qubit allocation, use, and deallocation in a programming language with a reversible subset. …
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Nonlinear Optics Quantum Computation and Quantum Simulation with Circuit-QED
Superconducting quantum circuits are a promising approach for realizations of large scale quantum information processing and quantum simulations. The Josephson junction, which forms the basis of superconducting circuits, is the only known nonlinear non-dissipative circuit element, and its inherent …
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