A new type of quantum entangling gate based on a waveguide lattice.
Researchers in the Optical Nanomaterial Group at ETH Zurich have demonstrated a new type of quantum logic gate that entangles single photon qubits. This methodology could lead to more compact and more efficient photonic quantum information processors.
In this work, we perform a controlled-NOT gate on single photon qubits, which is one of the key entangling operations required for universal quantum computation. We propose and demonstrate a fundamentally new configuration of the controlled-NOT gate based on an array of coupled waveguides, fabricated in the emerging lithium niobate-on-insulator platform.
Our experiment demonstrates a new method to build integrated photonic circuits that could enable much more compact devices because we remove the need for waveguide bends, which often dominate the chip area. We build on the extensive fabrication capabilities in the Optical Nanomaterial Group to produce this device in lithium niobate on insulator, one of the most promising photonic technologies for both quantum and classical applications.
Read more about our controlled-NOT entangling gate in IOP Quantum Science and Technology: external page https://iopscience.iop.org/article/10.1088/2058-9565/ad0a48
