We realize quantum gates for path qubits with a high-speed,polarization-independent and tunable beam splitter. Two electro-opticalmodulators act in a Mach-Zehnder interferometer as high-speed phase shiftersand rapidly tune its splitting ratio. We test its performance with heraldedsingle photons, observing a polarization-independent interference contrastabove 95%. The switching time is about 5.6 ns, and a maximal repetition rate is2.5 MHz. We demonstrate tunable feed-forward operations of a single-qubit gateof path-encoded qubits and a two-qubit gate via measurement-induced interactionbetween two photons.
展开▼
