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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 46 for “"quantum error correction"”.
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Channel-adapted quantum error correction
Quantum error correction (QEC) is an essential concept for any quantum information processing device. Typically, QEC is designed with minimal assumptions about the noise process; this generic assumption exacts a high cost in efficiency and performance. We examine QEC methods that are adapted to the …
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Extensible Platforms for Bosonic Quantum Error Correction
Bosonic quantum error correction (QEC) encodes information in the phase space of a quantum harmonic oscillator and offers a hardware-efficient path towards faulttolerant quantum information processing. With superconducting circuits, bosonic QECusing the Gottesman-Kiteav-Preskill (GKP) encoding has …
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Device- and application-adapted quantum error correction
Precise control of coherent quantum systems could enable new generations of sensing, communication and computing technologies. Such systems, however, are typically noisy and difficult to stabilize. One promising technique to this end is called quantum error correction, which encodes quantum states …
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Trellis Decoding And Applications For Quantum Error Correction
Compact, graphical representations of error-correcting codes called trellises are a crucial tool in classical coding theory, establishing both theoretical properties and performance metrics for practical use. The idea was extended to quantum error-correcting codes by Ollivier and Tillich in 2005. …
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Quantum Error Correction for Physically Inspired Error Models
… we will discuss methods for creating error-robust logical qubits which have been optimized for trapped ion quantum computers. We will cover the basic building blocks of quantum information and develop an understanding of the standard techniques for building fault-tolerant quantum …
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Bosonic Quantum Error Correction with a Heavy Fluxonium Control Qubit
… codes store information in the phase space of a quantum harmonic oscillator and offer a hardware‐efficient path towards quantum error correction (QEC), requiring only an oscillator and an auxiliary qubit for measurement and universal control. Of the many bosonic codes, the so‐called …
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THE EFFECT OF THE ANCILLA VERIFICATION ON THE QUANTUM ERROR CORRECTION
… is the prototypical application of error-correction methods. To communicate, a sender needs to convey information to a receiver over a noisy "communication channel." Such a channel can be thought of as a means of transmitting an information-carrying physical system from one place to …
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Simulation and Design of Quantum Processors for Low‑Overhead Quantum Error Correction
… hardware architecture required for large‑scale quantum error correction (QEC). Specifically, we design microwave circuits for fast and high‑fidelity readout and devise a long‑range coupler (LRC) that spans five qubit lattice sites, suitable for low‑overhead quantum low‑density parity‑check …
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Calibration and Control of Superconducting Qubits for Low‑Overhead Quantum Error Correction
The ability to coherently and reliably manipulate quantum information marks a fundamental technological leap—realizable through a universal, fault‑tolerant quantum computer. Achieving this goal requires progress across all layers of the quantum computing stack, from physical qubits to theoretical …
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Optimal Quaternary Hermitian Linear Complementary Dual Codes for Entanglement-Assisted Quantum Error Correction
… codes and import them into entanglement-assisted quantum codes. The thesis begins by introducing classical error correction, followed by a detailed introduction to quantum computing. Topics that are discussed in the introduction include qubits, quantum phenomena, such as superposition and …
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Quantum Algebraic Geometry Codes
Quantum error correction is an essential aspect of quantum information theory, providing protection for quantum states against noise and decoherence. This thesis investigates the construction of quantum error correction codes derived from classical algebraic geometry (AG) codes. We present two …
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QAOA applied to the portfolio optimization problem
Quantum computing is no longer in its early stages. There already exists quantum computers with more qubits than a classical computer is capable of efficiently simulating. This current stage is considered intermediate and is therefore called the NISQ era (noisy intermediate-scale quantum). The main …
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Data-Driven Decoding of Quantum Surface Codes using Recurrent Neural Networks
Quantum computers has the potential to outperform classical computers for certain tasks, but the practical use of quantum computers is limited by noise and errors in quantum systems. Quantum Error Correction (QEC) provides a way for detecting and correcting these errors, but in the presence of …
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Constructing CSS-T Codes from Extended Quasi-Cyclic Codes
… can be used to construct CSS-T codes for quantum-error correction.
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Graph Representation of Topological Stabilizer States
Topological quantum states, especially these in topological stabilizer quantum error correction codes, are currently the focus of intense activity because of their potential for fault-tolerant operations. While every stabilizer state maps to a graph state under local Clifford operations, the graphs …
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Toward Practical Quantum Computing Systems with Intelligent Cross-Stack Co-Design
Quantum Computing (QC) has the potential to solve classically hard problems with greater speed and efficiency, and recent years have seen exciting advancements in this field. However, significant gaps remain between application requirements and the capabilities of current devices, particularly in …
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Non-Gaussian noise spectroscopy with superconducting qubits
Most quantum control and quantum error-correction protocols assume that the noise causing decoherence is described by Gaussian statistics. However, the Gaussianity assumption breaks down when the quantum system is strongly coupled to a sparse environment or has a non-linear response to external …
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RECOVERY AND RECONSTRUCTION IN QUANTUM SYSTEMS
Quantum systems are prone to noises. Accordingly, many techniques are developed tocancel the action of a quantum operation, or to protect the quantum information against the noises. In this dissertation, I discuss two such schemes, namely the recovery channel and the quantum error correction, and …
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Benchmarking measurement-based quantum computation on graph states
Measurement-based quantum computation is a form of quantum computing that operates on a prepared entangled graph state, typically a cluster state. In this dissertation, we will detail the creation of graph states across various physical platforms using different entangling gates. We will then …
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Interference Purcell Filter for Fast, Modular, and Hardware-Efficient Quantum Measurement
… decay for fast, modular, and hardware-efficient quantum measurement that we call an “interference” Purcell filter. Superconducting qubits experience many decay channels, one of which is Purcell decay, or leakage of the qubit state into the readout line. The proposed work suppresses Purcell decay …
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