Time-Domain Universal Linear-Optical Operations for Universal Quantum Information Processing

Abstract

We demonstrate universal and programmable three-mode linear optical operations in the time domain by realizing a scalable dual-loop optical circuit suitable for universal quantum information processing (QIP). The programmability, validity, and deterministic operation of our circuit are demonstrated by performing nine different three-mode operations on squeezed-state pulses, fully characterizing the outputs with variable measurements, and confirming their entanglement. Our circuit can be scaled up just by making the outer loop longer and also extended to universal quantum computers by incorporating feedforward systems. Thus, our work paves the way to large-scale universal optical QIP.

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• Fault-tolerant quantum computation by hybrid qubits with bosonic cat-code and single photons
• Variational quantum algorithm for ergotropy estimation in quantum many-body batteries
• Observation of quantum temporal correlations well beyond Luders bound
• Sequential and Programmable Squeezing Gates for Optical Non-Gaussian Input States
• Quantum cryptographic protocols with dual messaging system via 2D alternate quantum walk of a genuine single-photon entangled state
• Time-domain programmable beam-splitter operations for an optical phase-sensitive non-Gaussian state
• Exploring the boundary of quantum correlations with a time-domain optical processor
• Quantum-secure multiparty deep learning
• Quantum non-Gaussian high Fock states of light pulses and their superpositions
• Extensible universal photonic quantum computing with nonlinearity