Universal programmable photonic architecture for quantum information processing

Ben Bartlett, Shanhui Fan

Research output: Contribution to journalArticlepeer-review

Abstract

We present a photonic integrated circuit architecture for a quantum programmable gate array (QPGA) capable of preparing arbitrary quantum states and operators. The architecture consists of a lattice of phase-modulated Mach-Zehnder interferometers, which perform rotations on path-encoded photonic qubits, and embedded quantum emitters, which use a two-photon scattering process to implement a deterministic controlled-σz operation between adjacent qubits. By appropriately setting phase shifts within the lattice, the device can be programmed to implement any quantum circuit without hardware modifications. We provide algorithms for exactly preparing arbitrary quantum states and operators on the device, and we show that gradient-based optimization can train a simulated QPGA to automatically implement highly compact approximations to important quantum circuits with near-unity fidelity.

Original languageEnglish
Article number042319
JournalPhysical Review A
Volume101
Issue number4
DOIs
Publication statusPublished - Apr 2020
Externally publishedYes

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