COHERENCE AND DECOHERENCE
This chapter focuses on coherence and decoherence, starting from the basis of quantum mechanics and including the classical paradox of Schrödinger’s cat and entanglement. Decoherence and relaxation are simultaneously accounted for by an evolution equation for the density matrix, which is analysed in the case of spin tunnelling and simplifies when decoherence is complete. The final section discusses the possible exploitation of coherence in quantum computing.
Keywords: coherence, decoherence, entanglement, density matrix, master equation, spin tunnelling, quantum computing, qubits
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