This book provides a step-by-step guide on how to construct a narrowband single photon source for the integration with atom-based memory systems. It combines the necessary theoretical background with crucial experimental methods and characterisations to form a complete handbook for readers at all academic levels. The future implementation of large quantum networks will require the hybridisation of photonic qubits for communication with quantum memories in the context of information storage. Such an interface requires carefully tailored single photons to ensure compatibility with the chosen memory. The source itself is remarkable for a number of reasons, including being the spectrally narrowest and brightest source of its kind; in addition, it offers a novel technique for frequency stabilisation in an optical cavity, together with exceptional portability. Starting with a thorough analysis of the current literature, this book derives the essential parameters needed to design the source, describes its individual components in detail, and closes with the characterisation of a single photon source.
This book provides a step-by-step guide on how to construct a narrowband single photon source for the integration with atom-based memory systems. It combines the necessary theoretical background with crucial experimental methods and characterisations to form a complete handbook for readers at all academic levels. The future implementation of large quantum networks will require the hybridisation of photonic qubits for communication with quantum memories in the context of information storage. Such an interface requires carefully tailored single photons to ensure compatibility with the chosen memory. The source itself is remarkable for a number of reasons, including being the spectrally narrowest and brightest source of its kind; in addition, it offers a novel technique for frequency stabilisation in an optical cavity, together with exceptional portability. Starting with a thorough analysis of the current literature, this book derives the essential parameters needed to design the source, describes its individual components in detail, and closes with the characterisation of a single photon source.
In the last decades of the 17th century, the feast of Christmas in Lutheran Germany underwent a major transformation when theologians and local governments waged an early modern "war on Christmas," discouraging riotous pageants and carnivalesque rituals in favor of more personal and internalized expressions of piety. Christmas rituals, such as the "Heilig Christ" plays and the rocking of the child (Kindelwiegen) were abolished, and Christian devotion focused increasingly on the metaphor of a birth of Christ in the human heart. John Sebastian Bach's Christmas Oratorio, composed in 1734, both reflects this new piety and conveys the composer's experience living through this tumult during his own childhood and early career. Markus Rathey's book is the first thorough study of this popular masterpiece in English. While giving a comprehensive overview of the Christmas Oratorio as a whole, the book focuses on two themes in particular: the cultural and theological understanding of Christmas in Bach's time and the compositional process that led Bach from the earliest concepts to the completed piece. The cultural and religious context of the oratorio provides the backdrop for Rathey's detailed analysis of the composition, in which he explores Bach's compositional practices, for example, his reuse and parodies of movements that had originally been composed for secular cantatas. The book analyzes Bach's original score and sheds new light on the way Bach wrote the piece, how he shaped musical themes, and how he revised his initial ideas into the final composition.
Every year, Johann Sebastian Bach’s major vocal works are performed to mark liturgical milestones in the Christian calendar. Written by a renowned Bach scholar, this concise and accessible book provides an introduction to the music and cultural contexts of the composer’s most beloved masterpieces, including the Magnificat, Christmas Oratorio, and St. John Passion. In addition to providing historical information, each chapter highlights significant aspects—such as the theology of love—of a particular piece. This penetrating volume is the first to treat the vocal works as a whole, showing how the compositions were embedded in their original performative context within the liturgy as well as discussing Bach’s musical style, from the detailed level of individual movements to the overarching aspects of each work. Published in the approach to Easter when many of these vocal works are performed, this outstanding volume will appeal to casual concertgoers and scholars alike.
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