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Fast quantum control of cavities using an improved protocol without coherent errors
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The selective number-dependent arbitrary phase (SNAP) gates form a powerful class of quantum gates, imparting arbitrarily chosen phases to the Fock states of a cavity. However, for short pulses, coherent errors limit the performance. Here we demonstrate in theory and experiment that such errors can be completely suppressed, provided that the pulse times exceed a specific limit. The resulting shorter gate times also reduce incoherent errors. Our approach needs only a small number of frequency components, the resulting pulses can be interpreted easily, and it is compatible with fault-tolerant schemes.
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Fock-state preparation based on amplitude amplification in cavity QED
A new amplitude-amplification technique gives O(n^{1/4}) gate count for Fock-state preparation and 1/√p scaling for single-photon generation.
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