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Viewpoint: A Roadmap for a Scalable Topological Quantum Computer

Jay Deep Sau

Published Jun 21, 2017• 0 citations
OpenAlex

Abstract

A team of experimentalists and theorists proposes a scalable protocol for quantum computation based on topological superconductors.

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Optical Quantum Computers

Warit Asavanant, Akira Furusawa

This book is a current and rare treatment of the theoretical and experimental aspects of one of the most promising approaches to quantum computation—continuous-variable (CV) quantum computation using optical systems. In addition to its pedagogical value to those new to quantum computing, it is also a practical handbook for both experimentalists and theorists working in the field. Optical Quantum Computers: A Route to Practical Continuous Variable Quantum Information Processing summarizes many recent experimental developments and fills a gap in current literature. This timely book:Provides up-to-date discussions based on experiments and expertise of the scientists building quantum computersCenters around the idea of time-domain quantum computationHighlights work by the team from the Furusawa–Yoshikawa Laboratory at The University of Tokyo—one of the leading quantum computing labs in the world Researchers, graduate students, and those working in the quantum computing industry and its related fi elds will fi nd this an invaluable resource.

•Jan 25, 2022•19 citations

Blueprint for fault-tolerant quantum computation with topological qubit arrays

David Aasen, Morteza Aghaee, Zulfi Alam +97 more

We describe a concrete device roadmap toward a fault-tolerant quantum computing architecture based on noise-resilient, topologically protected Majorana-based qubits. Our roadmap encompasses four generations of devices: a single-qubit device that enables a measurement-based qubit benchmarking protocol; a two-qubit device that uses measurement-based braiding to perform single-qubit Clifford operations; an eight-qubit device that can be used to show an improvement of a two-qubit operation when performed on logical qubits rather than directly on physical qubits; and a topological qubit array supporting lattice surgery demonstrations on two logical qubits. Devices that enable this path require a superconductor-semiconductor heterostructure that supports a topological phase, quantum dots and coupling between those quantum dots that can create the appropriate loops for interferometric measurements, and a microwave readout system that can perform fast, low-error single-shot measurements. We describe the key design components of these qubit devices, along with the associated protocols for demonstrations of single-qubit benchmarking, Clifford gate execution, quantum error detection, and quantum error correction, which differ greatly from those in more conventional qubits. Finally, we comment on implications and advantages of this architecture for utility-scale quantum computation.

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Combining Topological Hardware and Topological Software: Color-Code Quantum Computing with Topological Superconductor Networks

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Preserving the delicate states that store information in a quantum computer when dealing with a noisy environment is a considerable challenge, and many researchers are turning to hardware- and software-based topological protection as a solution. A new paradigm based on error-correcting color codes combines the advantages of both hardware and software and enables a scalable approach to fault-tolerant quantum computing.

arXiv:1704.01589•Physical Review X•Sep 15, 2017•73 citations

Building a Cheap, Scalable, Error Corrected, Room Temperature, Topological Quantum Computer with Current Technology Using Only Social Networks of People

Trevor Nestor

•Nov 7, 2025•0 citations
This book is a current and rare treatment of the theoretical and experimental aspects of one of the most promising approaches to quantum computation—continuous-variable (CV) quantum computation using optical systems. In addition to its pedagogical value to those new to quantum computing, it is also a practical handbook for both experimentalists and theorists working in the field. Optical Quantum Computers: A Route to Practical Continuous Variable Quantum Information Processing summarizes many recent experimental developments and fills a gap in current literature. This timely book:Provides up-to-date discussions based on experiments and expertise of the scientists building quantum computersCenters around the idea of time-domain quantum computationHighlights work by the team from the Furusawa–Yoshikawa Laboratory at The University of Tokyo—one of the leading quantum computing labs in the world Researchers, graduate students, and those working in the quantum computing industry and its related fi elds will fi nd this an invaluable resource.
We describe a concrete device roadmap toward a fault-tolerant quantum computing architecture based on noise-resilient, topologically protected Majorana-based qubits. Our roadmap encompasses four generations of devices: a single-qubit device that enables a measurement-based qubit benchmarking protocol; a two-qubit device that uses measurement-based braiding to perform single-qubit Clifford operations; an eight-qubit device that can be used to show an improvement of a two-qubit operation when performed on logical qubits rather than directly on physical qubits; and a topological qubit array supporting lattice surgery demonstrations on two logical qubits. Devices that enable this path require a superconductor-semiconductor heterostructure that supports a topological phase, quantum dots and coupling between those quantum dots that can create the appropriate loops for interferometric measurements, and a microwave readout system that can perform fast, low-error single-shot measurements. We describe the key design components of these qubit devices, along with the associated protocols for demonstrations of single-qubit benchmarking, Clifford gate execution, quantum error detection, and quantum error correction, which differ greatly from those in more conventional qubits. Finally, we comment on implications and advantages of this architecture for utility-scale quantum computation.