Quantum computer using a trapped-ion spin molecule and microwave radiation
Quantum computer using a trapped-ion spin molecule and microwave radiation
复制标题
使用俘获离子自旋分子和微波辐射的量子计算机
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
J. Twamley
中科院分区：
文献类型：
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作者：
D. M. Hugh;J. Twamley
我们提出了一种量子信息处理器的设计，其中量子比特被编码成离子的超精细状态，这些离子被保存在单独定制的线性微陷阱的线性阵列中，并位于空间变化的磁场中。磁场梯度引入了空间相关的量子比特跃迁频率和一种量子比特之间的自旋-自旋相互作用。与液体核磁共振量子计算一样，单量子比特和多量子比特操作是通过共振微波脉冲实现的，而量子比特的读出和重置是通过囚禁离子荧光搁置技术实现的。通过调整微陷阱的配置，我们可以在硬件上定制量子比特的共振频率和耦合强度。我们证明了该系统具有不随处理器大小而扩展的边带转换结构，允许在量子比特之间进行可伸缩的频率区分。通过使用大的磁场梯度，人们可以通过频率选择性光脉冲来重置离子链中的单个量子比特，以实现量子误差校正，从而避免了对许多紧密聚焦的激光束的需要。
We propose a design for a quantum-information processor where qubits are encoded into hyperfine states of ions held in a linear array of individually tailored linear microtraps and sitting in a spatially varying magnetic field. The magnetic field gradient introduces spatially dependent qubit transition frequencies and a type of spin-spin interaction between qubits. Single- and multiqubit manipulation is achieved via resonant microwave pulses as in liquid-NMR quantum computation while the qubit readout and reset is achieved through trapped-ion fluorescence shelving techniques. By adjusting the microtrap configurations we can tailor, in hardware, the qubit resonance frequencies and coupling strengths. We show that the system possesses a sideband transition structure which does not scale with the size of the processor, allowing scalable frequency discrimination between qubits. By using large magnetic field gradients, one can reset individual qubits in the ion chain via frequency selective optical pulses to implement quantum-error correction, thus avoiding the need for many tightly focused laser beams.