Abstract
Integrated quantum photonics is an appealing platform for quantum information processing, quantum communication and quantum metrology. In all these applications it is necessary not only to be able to create and detect Fock states of light but also to programme the photonic circuits that implement some desired logical operation. Here we demonstrate a reconfigurable controlled two-qubit operation on a chip using a multiwaveguide interferometer with a tunable phase shifter. We found excellent agreement between theory and experiment, with a 0.98 ± 0.02 average similarity between measured and ideal operations.
Highlights
We focus on the implementation of reconfigurable photonic quantum gates on a chip [10,11,12]
We study a tunable two-qubit gate that is a generalization of the CNOT gate
We use the path-encoding of qubits as opposed to polarization encoding [16], which is another emerging approach to integrated quantum photonics
Summary
We focus on the implementation of reconfigurable photonic quantum gates on a chip [10,11,12]. The on-chip device implementing the tunable two-qubit operation was designed to be an extension of the CNOT gate [15]. The reconfigurable quantum photonic chip was coupled from both sides to V-groove arrays of optical fibres.
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