AI 中文总结
本研究提出以Kramers-Henneberger原子为量子比特平台，通过含时薛定谔方程模拟实现飞秒级超快单量子比特门，其速度远超超导量子比特门，且保真度受结构化泄漏限制，具备实现阿秒级操作的潜力。
AI 中文摘要
我们提出并演示将Kramers-Henneberger（KH）原子作为新型量子比特平台，用于超快单量子比特门操作。在KH框架中，时间平均强激光场构建出双势阱，其两个最低本征态定义量子比特基矢，因此计算结构由驱动场自身生成并维持。弱共振控制场驱动相干门操作：采用完整含时KH势的全含时薛定谔方程模拟，证实可实现飞秒量级的Z门和S门，比激光驱动的超导量子比特门快六个数量级。退相干特性显示，其退相干时间长于门操作所需时间。在时间平均二能级极限下，演示了完整的六门单量子比特集合，全描述与时间平均描述间的强一致性证实，保真度受限于结构化泄漏而非随机退相干，原则上该误差通道可通过脉冲工程抑制。这些结果是强场环境下相干单量子比特门的首次演示，明确具备实现阿秒量级操作的路径。
英文摘要
We propose and demonstrate the Kramers-Henneberger KH) atom as a novel qubit platform for ultrafast single-qubit gate operations. In the KH frame, the time-averaged strong laser field engineers a double-well potential whose two lowest eigenstates define the qubit basis, so that the computational structure is created and maintained by the driving field itself. A weak resonant control field drives coherent gate operations: full time-dependent Schrödinger equation simulations with the complete time-dependent KH potential confirm a Z gate and S gate of the order of femtoseconds, six orders of magnitude faster than laser-driven superconducting qubit gates. Decoherence characterisation gives longer decoherence times than those required for the gate operations. The complete six-gate single-qubit set is demonstrated in the time-averaged two-level limit, with strong agreement between the full and time-averaged descriptions confirming that fidelity is limited by structured leakage rather than stochastic decoherence. In principle, this is an error channel suppressible through pulse engineering. These results constitute the first demonstration of coherent single-qubit gates in a strong-field setting, with a clear pathway toward attosecond-scale operations.
Comments30 pages including appendices, 20 figures
