Topological quantum computation

Deyuan Zou, Naiqiao Pan, Tian Chen +2 more

The key obstacle to the realization of a scalable quantum computer is overcoming environmental and control errors. Topological quantum computation attracts great attention because it emerges as one of the most promising approaches to solving these problems. Various theoretical schemes for building topological quantum computation have been proposed. However, experimental implementation has always been a great challenge because it has proved to be extremely difficult to create and manipulate topological qubits in real systems. Therefore, topological quantum computation has not been realized in experiments yet. Herein, the first experimental simulation of topological quantum computation with classical circuits is reported. Based on the proposed new scheme with circuits, not only Majorana‐like edge states are simulated experimentally, but also T junctions are constructed for simulating the braiding process. Furthermore, the feasibility of simulated topological quantum computing through a set of one‐ and two‐qubit unitary operations is demonstrated. Finally, the simulation of Grover's search algorithm demonstrates that simulated topological quantum computation is ideally suited for such tasks. The developed circuit‐based topological quantum‐computing simulator can provide important references for developing future topological quantum circuits.

Jiannis K. Pachos

Tapio Simula

Deyuan Zou, Naiqiao Pan, Tian Chen +2 more

The key obstacle to the realization of a scalable quantum computer is overcoming environmental and control errors. Topological quantum computation has attracted great attention because it has emerged as one of the most promising approaches to solving these problems. Various theoretical schemes for building topological quantum computation have been proposed. However, experimental implementation has always been a great challenge because it has proved to be extremely difficult to create and manipulate topological qubits in real systems. Therefore, topological quantum computation has not been realized in experiments yet. Here, we report the first experimental realization of topological quantum computation with electric circuits. Based on our proposed new scheme with circuits, Majorana-like edge states are not only observed experimentally, but also T junctions are constructed for the braiding process. Furthermore, we demonstrate the feasibility of topological quantum computing through a set of one- and two-qubit unitary operations. Finally, our implementation of Grover's search algorithm demonstrates that topological quantum computation is ideally suited for such tasks.

R. W. Ogburn, John P. Preskill

Jincheng Zhang

Quantum computation represents a paradigm shift in information processing, promising exponential speedups for specific computational tasks. However, a significant hurdle to realizing practical quantum computers lies in the phenomenon of quantum decoherence – the loss of quantum information due to interactions with the surrounding environment. This work explores the potential of topological quantum computation (TQC) as a robust solution to mitigate decoherence. TQC leverages exotic states of matter, specifically surface states of topological insulators and quantum spin Hall systems, to create protected quantum bits (qubits). These states exhibit inherent topological protection, meaning their quantum properties are robust against local perturbations, drastically reducing the detrimental effects of decoherence. We detail the core principles of TQC, focusing on how the topological nature of these materials safeguards quantum information. We will demonstrate how this approach minimizes the influence of environmental noise, leading to improved qubit coherence times and, consequently, enhanced fidelity in quantum computations. This research contributes to the ongoing exploration of TQC as a viable pathway towards scalable and fault-tolerant quantum computing.