期刊
PHYSICAL REVIEW APPLIED
卷 15, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.024054
关键词
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资金
- MCIU/AEI/FEDER,UE [PGC2018-094792-B-I00]
- CSIC Research Platform [PTI-001]
- CAM/FEDER Project [S2018/TCS-4342]
- Institut fur Quanteninformation GmbH
Research suggests that utilizing an ultrafast laser source can achieve rapid entangling-gate operations. A frequency comb emits bursts of several hundred mode-locked pulses, meeting the requirements for a two-qubit gate operation.
The conventional approach to perform two-qubit gate operations in trapped ions relies on exciting the ions on motional sidebands with laser light, which is an inherently slow process. One way to implement a fast entangling-gate protocol requires a suitable pulsed laser to increase the gate speed by orders of magnitude. However, the realization of such a fast entangling-gate operation presents a big technical challenge, as such the required laser source is not available off the shelf. For this, we engineer an ultrafast entangling-gate source based on a frequency comb. The source generates bursts of several hundred mode-locked pulses with pulse energy approximately 800 pJ at 5-GHz repetition rate at 393.3 nm and complies with all requirements for implementing a fast two-qubit gate operation. Using a single, chirped ultraviolet pulse, we demonstrate a rapid adiabatic passage in a Ca+ ion. To verify the applicability and projected performance of the laser system for inducing entangling gates we run simulations based on our source parameters. The gate time can be faster than a trap period with an error approaching 10(-4).
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