主动稳定化、量子计算与量子态合成
Active stabilisation, quantum computation and quantum state synthesis
摘要：
量子系统的主动稳定是主动抑制系统中的噪声（如退相干），而不破坏其幺正演化。量子纠错提出了实现这一点的可能性，但前提是恢复网络能够抑制比它引入的更多的噪声。提出了一种构造这种网络的一般方法，它比以前的容错设计有了很大的改进。该结构允许量子纠错被理解为本质上是量子态合成。近似分析意味着，在量子计算机上涉及非常多计算步骤的算法因此成为可能。
英文摘要：
Active stabilisation of a quantum system is the active suppression of noise (such as decoherence) in the system, without disrupting its unitary evolution. Quantum error correction suggests the possibility of achieving this, but only if the recovery network can suppress more noise than it introduces. A general method of constructing such networks is proposed, which gives a substantial improvement over previous fault tolerant designs. The construction permits quantum error correction to be understood as essentially quantum state synthesis. An approximate analysis implies that algorithms involving very many computational steps on a quantum computer can thus be made possible.
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