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Quantum Teleportation and Entanglement: A Hybrid Approach to Optical Quantum Information Processing

Akira Furusawa, Peter van Loock

Published May 2, 2011• 98 citations
OpenAlex

Abstract

Unique in that it is jointly written by an experimentalist and a theorist, this monograph presents universal quantum computation based on quantum teleportation as an elementary subroutine and multi-party entanglement as a universal resource. Optical approaches to measurement-based quantum computation are also described, including schemes for quantum error correction, with most of the experiments carried out by the authors themselves. Ranging from the theoretical background to the details of the experimental realization, the book describes results and advances in the field, backed by numerous i

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Unique in that it is jointly written by an experimentalist and a theorist, this monograph presents universal quantum computation based on quantum teleportation as an elementary subroutine and multi-party entanglement as a universal resource. Optical approaches to measurement-based quantum computation are also described, including schemes for quantum error correction, with most of the experiments carried out by the authors themselves. Ranging from the theoretical background to the details of the experimental realization, the book describes results and advances in the field, backed by numerous i
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.
Protocoles de téléportation quantique reposant sur l'intrication hybride de la lumière Cette thèse porte sur l'implémentation de protocoles de téléportation quantique impliquant conjointement les approches en variables discrètes et en variables continues de l'information quantique optique. Nous commençons par présenter l'intérêt de ces protocoles dans le cadre des réseaux quantiques hétérogènes, puis nous introduisons les techniques expérimentales pour la production d'états non-Gaussiens tels que des photons uniques, des chats de Schrödinger optiques, jusqu'à l'intrication hybride de la lumière entre des états quantiques en variables discrètes et continues. Nous développons un nouvel outil expérimental pour la mise en place d'une mesure de Bell qui intègre des techniques de comptage de photon et de sélection de quadratures du champ. Nous combinons ces méthodes en réalisant un protocole de transfert d'intrication entre deux états intriqués de natures différentes: une intrication à un photon et une intrication hybride de la lumière. Nous décrivons ensuite la mise en place d'une source de photons uniques annoncés supplémentaire et d'un système de cryogénie pour le fonctionnement de détecteurs de photon supraconducteurs. Enfin nous employons ces nouvelles ressources dans un protocole de téléportation quantique hybride permettant la conversion d'information quantique de variables discrètes à variables continues. Ces travaux ouvrent la voie à l'interconnexion de plateformes de natures différentes dans les réseaux quantiques hétérogènes.
We investigate experiments of continuous-variable quantum information processing based on the teleportation scheme. Quantum teleportation, which is realized by a two-mode squeezed vacuum state and measurement-and-feedforward, is considered as an elementary quantum circuit as well as quantum communication. By modifying ancilla states or measurement-and-feedforwards, we can realize various quantum circuits which suffice for universal quantum computation. In order to realize the teleportation-based computation we improve the level of squeezing, and fidelity of teleportation. With a high-fidelity teleporter we demonstrate some advanced teleportation experiments, i.e., teleportation of a squeezed state and sequential teleportation of a coherent state. Moreover, as an example of the teleportation-based computation, we build a QND interaction gate which is a continuous-variable analog of a CNOT gate. A QND interaction gate is constructed only with ancillary squeezed vacuum states and measurement-and-feedforwards. We also create continuous-variable four mode cluster type entanglement for further application, namely, one-way quantum computation.
It would be difficult to overestimate the level of attention being paid worldwide to quantum information processing, and anticipated advantages it may offer to a wide variety of pursuits in engineering, technology, and basic science. Futurists muse on the wondrous possibilities and theorists formulate actual algorithms for advanced computing not possible with classical computing machines, if only there were scalable quantum computers. Further, several groups have performed compelling experiments related to quantum teleportation and quantum key distribution – both essential pieces for quantum cryptography. Still, it is a very challenging hardware problem to design architectures that support, appropriately protect, route, and process qubits to function as universal logic gates. To date, most of the optical successes toward this goal have been in bulk media, which is not easily scalable to carry out the required degree quantum error correction. In this talk, I will discuss a couple of the proposals that my collaborators at the Air Force Research Laboratory, at the Rochester Institute of Technology, and I have made toward addressing the issue, among others, of scalability. Further, thanks to the inception of the AIM Photonics Initiative, I will talk briefly about experimental tests that we have started and others that we have planned for assessing in situ the effectiveness of the devices that we have analyzed theoretically.