The Zeno effect occurs in quantum systems when a very strong measurement is applied, which can alter the dynamics in non-trivial ways. Despite being dissipative, the dynamics stay coherent within any degenerate subspaces of the measurement. Here we show that such a measurement can turn a single-qubit operation into a two- or multi-qubit entangling gate, even in a non-interacting system. We demonstrate this gate between two effectively non-interacting transmon qubits. Our Zeno gate works by imparting a geometric phase on the system, conditioned on it lying within a particular non-local subspace. These results show how universality can be generated not only by coherent interactions as is typically employed in quantum information platforms, but also by Zeno measurements.

当应用非常强的测量时，Zeno 效应会发生在量子系统中，这可以以非平凡的方式改变动力学。尽管是耗散的，但动力学在测量的任何退化子空间内保持一致。在这里，我们展示了这种测量可以将单量子位操作转变为两个或多量子位纠缠门，即使在非交互系统中也是如此。我们在两个有效的非交互传输量子比特之间展示了这个门。我们的芝诺门通过在系统上赋予几何相位来工作，条件是它位于特定的非局部子空间内。这些结果表明，普遍性不仅可以通过量子信息平台中通常采用的相干相互作用产生，还可以通过芝诺测量产生。