Reducing decoherence in quantum computer memory with all quantum bits coupling to the same environment
Abstract
Decoherence in quantum computer memory due to the inevitable coupling to the external environment is examined. We take the assumption that all quantum bits (qubits) interact with the same environment rather than the assumption of separate and independent environments for each qubit. It is found that all qubits loss their coherence ''coherently'' in this case. For some kinds of entangled input states, no decoherence occurs at all in the quantum memory even if the coupling to the externel world is not weak. A possible scheme for reducing decoherence in quanrum memory is discussed based on this phenomenon.Keywords
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