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This study presents an analytical method for generating arbitrary single-qubit quantum gates using a solitary modulated electromagnetic pulse under the rotating-wave approximation, eliminating the need for complex numerical optimization or multi-pulse sequences. By deriving closed-form formulas directly from inverted equations of motion, this approach offers enhanced theoretical control and potential simplification in physical implementation without relying on hardware-specific shortcuts.
Brazilian Researchers Demonstrate Universal Single-Qubit Gates with One Pulse
In this work, researchers address designing single-qubit quantum gates by means of a linearly-polarized field, showing any desired one-qubit gate can be generated by a modulated sinusoidal field with only the rotating-wave-approximation. Building high fidelity quantum gates is a fundamental task for quantum computing, as these logical gates are generated by electromagnetic control pulses.
Researchers at Universidade Federal de São Carlos (UFSCar) have demonstrated a new method for constructing any single-qubit quantum gate using a simplification: a single electromagnetic pulse. Building high fidelity quantum gates is a fundamental task for quantum computing. In the case of single-qubit gates, constructing arbitrary gates with a sequence of pulses is in principle straightforward, as demonstrated by Kok et al. and Häffner et al. The team obtained this result by inverting the equation of motion for the evolution operator, a standard method for obtaining the formula. This approach relies only on the rotating-wave-approximation, the only approximation involved, potentially streamlining implementation. A single, carefully shaped pulse of light can now enact any single-qubit quantum gate, a feat…
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