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Topological Quantum Computing

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Topological Entanglement Entropy

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A measure of quantum entanglement in topological states of matter, integral to topological quantum computers for assessing the topological properties of ground state wavefunctions.

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Fusion Rules

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Rules that dictate the outcome of combining (fusing) anyons, an essential part of topological quantum computation that determines how quantum information can be processed and read out.

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Quantum Error Correction

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The technique of protecting quantum information from errors due to decoherence and other quantum noise, crucial for topological quantum computers that inherently implement error correction through their topology.

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Anyons

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Quasiparticles with non-abelian statistics proposed to be used as a basis for qubits in topological quantum computers, leveraging their topological properties for error-resilient information encoding.

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Quantum Hall Effect

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A phenomenon where electrons in a two-dimensional system exhibit quantized Hall conductance, important for topological quantum computing because it provides an environment for anyons to emerge.

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Topological Quantum Field Theory (TQFT)

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A theoretical framework used in physics and mathematics to describe the topology of quantum fields, significant in topological quantum computing for providing mathematical tools to understand anyons.

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Kitaev Quantum Wire

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A theoretical model of a one-dimensional wire proposed by Alexei Kitaev that can host Majorana fermions at its ends, providing a physical implementation for topological qubits.

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Topological Order

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A form of quantum order that characterizes systems with ground states featuring robust global properties protected against local perturbations, crucial for fault-tolerant topological quantum computation.

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Topological Invariant

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A property that remains unchanged under continuous deformations, playing a pivotal role in topological quantum computing by ensuring stability and fault tolerance through preserved states.

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Braiding

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The process of topologically entangling anyons, utilized in topological quantum computing for creating and manipulating quantum gates and maintaining quantum coherence.

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Non-Abelian Anyons

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A type of anyon whose quantum state upon braiding depends not just on the class of braids, but also on the specific sequence of braiding steps, fundamental for realizing complex gate operations in topological QC.

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Quantum Knot Theory

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A branch of mathematics that studies knots within the framework of quantum computing, important for topological QC due to the role of knot invariants in understanding quantum states and transformations.

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Majorana Fermions

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Hypothetical particles that are their own antiparticles, proposed as ideal candidates for anyons in topological quantum computers due to their robustness against local disturbances.

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Topological Phase of Matter

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A state of matter like a superconductor or topological insulator, whose properties are protected by its topological characteristics, forming the basis for realizing error-resistant quantum computation.

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Chern-Simons Theory

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A topological quantum field theory used to describe certain three-dimensional topological states of matter, relevant in topological QC for providing a theoretical framework for anyonic physics.

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