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Analysis of a high-stability Stern-Gerlach spatial fringe interferometer
The discovery of the Stern-Gerlach (SG) effect almost a century ago was followed by suggestions to use the effect as a basis for matter-wave interferometry. However, the coherence of splitting particles with spin by a magnetic gradient to a distance exceeding the position uncertainty in each of the arms was not demonstrated until recently, where spatial interference fringes were observed in a proof-of-principle experiment. Here we present and analyze the performance of an improved high-stability SG spatial fringe interferometer based on two spatially separate wave packets with a maximal distance that is more than an order of magnitude larger than their minimal widths. The improved performance is enabled by accurate magnetic field gradient pulses, originating from a novel atom chip configuration, which ensures high stability of the interferometer operation. We analyze the achieved stability using several models, discuss sources of noise, and detail interferometer optimization procedures. We also present a simple analytical phase-space description of the interferometer sequence that demonstrates quantitatively the complete separation of the superposed wave packets2.
Journal Article
Insults in the Name of God
The Christian nationalist Doug Wilson says he isn’t trying to be Howard Stern but his language can be just as controversial. On this week’s “Interesting Times,” he defends his use of “naughty words” as weapons in his arsenal.
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Mesoscopic interference for metric and curvature & gravitational wave detection
A compact detector for space-time metric and curvature is highly desirable. Here we show that quantum spatial superpositions of mesoscopic objects could be exploited to create such a detector. We propose a specific form for such a detector and analyse how asymmetries in its design allow it to directly couple to the curvature. Moreover, we also find that its non-symmetric construction and the large mass of the interfered objects, enable the detection gravitational waves (GWs). Finally, we discuss how the construction of such a detector is in principle possible with a combination of state of the art techniques while taking into account the known sources of decoherence and noise. To this end, we use Stern-Gerlach interferometry with masses ∼10−17 kg, where the interferometric signal is extracted by measuring spins and show that accelerations as low as 5 × 10−15 ms−2 Hz−1/2, as well as the frame dragging effects caused by the Earth, could be sensed. The GW sensitivity scales differently from the stray acceleration sensitivity, a unique feature of the proposed interferometer. We identify mitigation mechanisms for the known sources of noise, namely gravity gradient noise, uncertainty principle and electro-magnetic forces and show that it could potentially lead to a metre sized, orientable and vibrational noise (thermal/seismic) resilient detector of mid (ground based) and low (space based) frequency GWs from massive binaries (the predicted regimes are similar to those targeted by atom interferometers and LISA).
Journal Article
Reflexiv – Implizit. Wie wir in psychodynamischen Prozessen wirksam werden
Michael Klöpper (Hg.) (2023). Vielmehr finden wir hier auf der Grundlage einer intersubjektiven Herangehensweise eine differenzierte Ausführung dessen, was der Therapeut oder die Therapeutin innerhalb der sich fortwährend entwickelnden therapeutischen Beziehung mental und emotional leistet. Der funktionale Aspekt steht für die Art und Weise, wie der Patient auf seine Beziehungserfahrungen reagiert hat und welche Anpassungsleistungen er vornehmen musste. Der dritte, systemische Aspekt bezeichnet die Inszenierung dieses impliziten Beziehungswissens, der Beziehungsmuster bzw. ihrer Repräsentanzen in der therapeutischen Dyade. Auf diesem Weg inszenieren sich die unbewussten Beziehungsmuster innerhalb der intersubjektiven Beziehung im Übertragungs-bzw. Gegen- übertragungsgeschehen u.a. in Form von Verwicklungen oder eines »disruption-and-repair« (S. 138) des Bindungsgeschehens. » Mit dem Begriff Gegenübertragung bezeichnen wir die Gesamtheit der unbewussten und bewussten Reaktionen des Therapeuten auf seinen Patienten, speziell auf dessen Übertragung bzw. auf seine Inszenierung [...] Im nächsten Beitrag (Kap. 9) stellt Elke Reinken, Fachärztin für Psychotherapeutische Medizin und Psychoanalytikerin, eine Kasuistik zur transgenerationalen Weitergabe eines traumatischen Komplexes vor, in der sie ihr psychoanalytisches Arbeiten mit der Ego-State-Therapie verbindet und ihre Wirksamkeit im intersubjektiven Feld erklärt. Wir erhalten hier eine Einführung in die Ego-State-Therapie und einen Eindruck, wie diese in die Arbeit mit der Gegenübertragung und der projektiven Identifizierung nach Heinz Weiß integriert werden kann mit dem Ziel, Selbstzustände emotional erfahr-und integrierbar werden zu lassen. Hier erleben wir mit, wie therapeutisches Arbeiten aussehen kann, wenn man sich die Zeit nimmt, sich mit der Welt des Patienten und der eigenen Gegenübertragung auseinanderzusetzen.
Journal Article
From Bauhaus to Buenos Aires : Grete Stern and Horacio Coppola
Published to accompany the first US museum exhibition of the work of German-born Grete Stern and Argentinean Horacio Coppola, this book explores the individual accomplishments and parallel developments of two of the foremost practitioners of avant-garde photography in Europe and Latin America. The book traces their artistic development from the late 1920s, when Stern established a pioneering commercial studio, ringl + pit, with her friend Ellen (Rosenberg) Auerbach, and Coppola began groundbreaking experimentations with photography in his native Argentina, to their joint studies at the Bauhaus and travels through Europe in the early 1930s, through the mid-1950s, by which time they had firmly established the foundations of modern photography in Buenos Aires.
Book
Quantum optimal control in quantum technologies. Strategic report on current status, visions and goals for research in Europe
Quantum optimal control, a toolbox for devising and implementing the shapes of external fields that accomplish given tasks in the operation of a quantum device in the best way possible, has evolved into one of the cornerstones for enabling quantum technologies. The last few years have seen a rapid evolution and expansion of the field. We review here recent progress in our understanding of the controllability of open quantum systems and in the development and application of quantum control techniques to quantum technologies. We also address key challenges and sketch a roadmap for future developments.
Journal Article