Experimental realization of universal quantum gates and six-qubit entangled state using photonic quantum walk
Kanad Sengupta, S. P. Dinesh, K. Muhammed Shafi, Soumya Asokan, C. M. Chandrashekar

TL;DR
This paper demonstrates the experimental realization of universal quantum gates and a six-qubit entangled state using photonic quantum walks, advancing photonic quantum computing at room temperature.
Contribution
It introduces a method to implement deterministic quantum gates and generate multi-qubit entanglement using single-photon quantum walks with multiple degrees of freedom.
Findings
High-fidelity quantum gates achieved via quantum walk
Successful creation of six-qubit GHZ state
Framework for scalable photonic quantum computing
Abstract
For quantum computation using photons, performing deterministic quantum gate operations is a challenge due to the probabilistic nature of the photon-photon interaction. Encoding qubits in multiple degrees-of-freedom of photons and controlling operations between them is one of the promising ways to navigate the probabilistic behavior. Using single-photon discrete-time quantum walk in combination with polarization and path degrees-of-freedom, we experimentally demonstrate the realization of a universal set of quantum gates with high fidelity at room temperature. The deterministic realization of quantum gates through photonic quantum walk are characterized via quantum state tomography. For a three-qubit system using a single photon, the first qubit is encoded using polarization information, and the other two qubits are encoded using path information, closely resembling a Galton-board…
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Taxonomy
TopicsQuantum Computing Algorithms and Architecture
