Abstract: Quantum decoherence is a critical issue for quantum computation as it affects qubit superposition and output fidelity and is typically due to the coupling of qubits to external fields and environmental variables (i.e., thermal fluctuations, molecular vibrations, and electromagnetic fields). In this presentation, we will discuss the nanoscopic origins of quantum decoherence by examining how atoms and qubits interact through electron interactions and entanglement. Furthermore, we will explore how external fields (magnetic and electric) and thermal fluctuations affect these interactions, leading to a breaking of quantum coherence. We will conclude by discussing potential mechanisms for enhancing qubit interactions to achieve more robust information fidelity.
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Abstract: There are quite a few computational problems for which a quantum algorithm is known that is substantially better than a classical algorithm. Despite this, large sums of money are being invested in the development of quantum computers around the world. In this overview, we will compare classical and quantum computing, and present reasons to invest and not to invest in quantum computing.
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