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arXiv quant-ph/0401066quant-phcond-mat
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电荷检测使自由电子量子计算成为可能

Charge detection enables free-electron quantum computation

C. W. J. Beenakker, D. P. DiVincenzo, C. Emary, M. Kindermann

摘要:

众所周知,在具有单电子哈密顿量的电子自旋量子比特上操作并由单自旋测量辅助的量子计算机可以在经典计算机上有效地模拟。我们发现,如果增加单电荷测量,量子算法的指数加速恢复。这些使得能够仅使用分束器和自旋旋转来构造自由费米子的CNOT(受控非)门。如果电荷检测器计数模式中的电子数量,则门几乎是确定性的,如果它只测量该数量的奇偶性,则完全是确定性的。

英文摘要:

It is known that a quantum computer operating on electron-spin qubits with single-electron Hamiltonians and assisted by single-spin measurements can be simulated efficiently on a classical computer. We show that the exponential speed-up of quantum algorithms is restored if single-charge measurements are added. These enable the construction of a CNOT (controlled NOT) gate for free fermions, using only beam splitters and spin rotations. The gate is nearly deterministic if the charge detector counts the number of electrons in a mode, and fully deterministic if it only measures the parity of that number.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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