渐近伪压缩映像不动点的三步带误差修正迭代逼近

在任意实赋范线性空间中,引入了一个新型的带误差的修正的三步迭代序列{x_n),在不限制"{x_n)有界"的条件下,证明了该迭代序列强收敛于一致Lipschitz渐近伪压缩映像T的不动点,且给出了该迭代序列强收敛的必要条件.其结果改进和推广了其他一些相应的近代结果,且证明方法也与以往的有所不同.     

2个有限族广义依中心意义的渐近非扩张非自映像公共不动点定理

在任意实的Banach空间中,对于2个有限族广义依中心意义的渐近非扩张非自映像,引入了一种新的带误差修正的广义Ishikawa迭代序列.并在适当条件下,多次巧妙地应用数学归纳法等工具,证明了该迭代序列强收敛于2个映像族的公共不动点.其结果改进和推广了近代许多相关的结果.     

Three-qubit quantum-gate operation with an SQUID in a cavity

We propose a method of realizing a three-qubit quantum gate with a superconducting quantum interference device(SQUID) in a cavity.In this proposal,the gate operation involves the SQUID ground-states and the Fock states of cavity modes b and c.The two field-modes act as the controlling qubits,and the two SQUID states form the target qubit.Since only the metastable lower levels are involved in the gate operation,the gate is not affected by the SQUID decay rates.