Book Section records
https://feeds.library.caltech.edu/people/Mabuchi-H/book_section.rss
A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenThu, 30 Nov 2023 18:13:30 +0000Single atoms in optical traps and high-Q cavities
https://resolver.caltech.edu/CaltechAUTHORS:20180709-145525419
Authors: Kimble, H. J.; Hu, Z.; Turchette, Q.; Mabuchi, H.; Thompson, R. J.
Year: 1995
DOI: 10.1117/12.206440
A variety of experiments are underway in the Quantum Optics Group at Caltech which investigate the quantum nature of atom-field interactions at the level of individual atoms and quanta. A recent technical advance in support of this research is the observation of cooling and trapping of single neutral cesium atoms in magneto-optical trap. Discrete steps are recorded in the fluorescence signal from the trap and are associated with the arrival and departure of individual trapped atoms. Such a spatially localized sample of a single atom with small kinetic energy is an enabling advance for diverse studies in quantum optics, including the possibility of spectroscopy with squeezed and other forms of nonclassical light and cavity quantum electrodynamics with strong coupling of an atom to the field of an optical cavity.https://authors.library.caltech.edu/records/e6bgf-t6034Real-time cavity QED with single atoms
https://resolver.caltech.edu/CaltechAUTHORS:20111222-104543227
Authors: Hood, C. J.; Lynn, T. W.; Mabuchi, H.; Chapman, M. S.; Ye, J.; Kimble, H. J.
Year: 1998
DOI: 10.1109/IQEC.1998.680002
We report the first measurement of the real-time evolution of the complex field amplitude brought on by single atom transits. We show the variation in time of both quadrature amplitudes (simultaneously recorded) of the light transmitted through the cavity, as well the resultant optical phase for a single atom transit event. In this particular measurement, the cavity and laser were both detuned by 10 MHz from the Cs resonance.https://authors.library.caltech.edu/records/91qk8-qj793Physical implementations for quantum communication in quantum networks
https://resolver.caltech.edu/CaltechAUTHORS:20111222-084016343
Authors: van Enk, S. J.; Cirac, J. I.; Zoller, P.; Kimble, H. J.; Mabuchi, H.
Year: 1998
DOI: 10.1109/IQEC.1998.680187
A quantum network where the data stored, processed, and communicated consists of quantum bits, would offer exciting possibilities including teleportation, dense coding, quantum money, secured quantum key distribution, and perhaps distributed quantum computing. But how to implement such a network? In this contribution we describe a concrete physical implementation consisting of atoms placed inside high-Q optical cavities, connected by optical fibers, that allow the atoms to communicate with each other using a cavity photon as the information carrier.https://authors.library.caltech.edu/records/8hdfk-xnn11Quantum information processing with cavity QED
https://resolver.caltech.edu/CaltechAUTHORS:20180709-143623311
Authors: Hood, C. J.; Lynn, T. W.; Mabuchi, H.; Chapman, M. S.; Ye, J.; Kimble, H. J.
Year: 1998
DOI: 10.1117/12.312635
Strongly coupled cavity QED systems show great promise for coherent processing of quantum information in the contexts of quantum computing, communication and cryptography. We present here current progress in experiments for which single atoms are strongly coupled to the mode of a high finesse optical resonator.https://authors.library.caltech.edu/records/b48db-xkf17Photonic crystal microcavities for strong coupling between an atom and the cavity field
https://resolver.caltech.edu/CaltechAUTHORS:20111201-075100332
Authors: Vučković, Jelena; Lončar, Marko; Mabuchi, Hideo; Scherer, Axel
Year: 2000
DOI: 10.1109/LEOS.2000.894116
We have demonstrated theoretically that photonic crystal (PC) cavities can be designed for strong interaction with atoms trapped in one of the PC holes. At present, we are working on further optimization of the design and the characterization of fabricated structures.https://authors.library.caltech.edu/records/03v28-ztk59Robust control in the quantum domain
https://resolver.caltech.edu/CaltechAUTHORS:DOHcdc00
Authors: Doherty, Andrew; Doyle, John; Mabuchi, Hideo; Jacobs, Kurt; Habib, Salman
Year: 2000
DOI: 10.1109/CDC.2000.912895
Progress in quantum physics has made it possible to perform experiments in which individual quantum systems are monitored and manipulated in real time. The advent of such new technical capabilities provides strong motivation for the development of theoretical and experimental methodologies for quantum feedback control. The availability of such methods would enable radically new approaches to experimental physics in the quantum realm. Likewise, the investigation of quantum feedback control will introduce crucial new considerations to control theory, such as the uniquely quantum phenomena of entanglement and measurement back-action. The extension of established analysis techniques from control theory into the quantum domain may also provide new insight into the dynamics of complex quantum systems. We anticipate that the successful formulation of an input-output approach to the analysis and reduction of large quantum systems could have very general applications in nonequilibrium quantum statistical mechanics and in the nascent field of quantum information theory.https://authors.library.caltech.edu/records/47dtb-hmf66Quantum feedback and adaptive measurements
https://resolver.caltech.edu/CaltechAUTHORS:MABqels01
Authors: Mabuchi, Hideo; Au, John; Chin, Jit Kee; Doherty, Andrew; Stockton, John
Year: 2001
DOI: 10.1109/QELS.2001.962176
Summary form only given. Although real-time feedback of measured signals is an essential component of sensing and control in classical settings, models for quantum feedback that are rigorous yet useful have only become possible since the advent of measurement-based quantum trajectory theory. The quantum feedback scenario introduces new concerns of coherence and measurement backaction, but recent work has shown that these can be treated properly in a formal integration of quantum trajectory theory with standard state-space formulations of filtering and control theory. Pioneering studies by H. M. Wiseman have shown that such models can be used to design and to analyze realistic schemes for adaptive homodyne measurement and for feedback control of atomic motion. Much of the ongoing research in our group focuses on the experimental implementation of such schemes. For a broad range of quantum feedback scenarios, certain recurring technical issues arise out of the need to perform complex, high-bandwidth processing of measured signals. We are developing a "rapid-prototyping" approach to refining signal processing and feedback algorithms via quantum trajectory simulation on a PC, followed by translation of the algorithms into hardware Description language (HDL).https://authors.library.caltech.edu/records/pkkk6-9k316A new bound of the ℒ2[0, T]-induced norm and applications to model reduction
https://resolver.caltech.edu/CaltechAUTHORS:SZNacc02
Authors: Sznaier, M.; Doherty, A. C.; Barahona, M.; Mabuchi, H.; Doyle, J. C.
Year: 2002
DOI: 10.1109/ACC.2002.1023179
We present a simple bound on the finite horizon ℒ2/[0, T]-induced norm of a linear time-invariant (LTI), not necessarily stable system which can be efficiently computed by calculating the ℋ∞ norm of a shifted version of the original operator. As an application, we show how to use this bound to perform model reduction of unstable systems over a finite horizon. The technique is illustrated with a non-trivial physical example relevant to the appearance of time-irreversible phenomena in statistical physics.https://authors.library.caltech.edu/records/qhaxm-mcj02High-Q optical nanocavities in planar photonic crystals
https://resolver.caltech.edu/CaltechAUTHORS:20180709-095327450
Authors: Vučković, Jelena; Lončar, Marko; Yoshie, Tomoyuki; Scherer, Axel; Armen, Michael; Williams, Jon; Mabuchi, Hideo
Year: 2002
DOI: 10.1117/12.469495
Planar photonic crystals are constructed by combining two-dimensional periodic structures with high refractive index contrast slabs. By suppressing the loss in these structures due to imperfect confinement in the third dimension, one can fully take advantage of their relatively simple fabrication, and achieve the functionality of three-dimensional photonic crystals. One of the greatest challenges in photonic crystal research is a construction of optical nanocavities with small mode volumes and large quality factors, for efficient localization of light. Beside standard applications of these structures (such as lasers or filters), they can potentially be used for cavity QED experiments, or as building blocks for quantum networks. This paper will address our theoretical and experimental results on optical nanocavities based on planar photonic crystals, with mode volumes as small as one half of cubic wavelength of light in material, and with Q factors even larger than 1 x 10^4.https://authors.library.caltech.edu/records/zhn80-9w415Nano-scale optical and quantum optical devices based on photonic crystals
https://resolver.caltech.edu/CaltechAUTHORS:VUCieeenano02
Authors: Vučković, Jelena; Yoshie, Tomoyuki; Lončar, Marko; Mabuchi, Hideo; Scherer, Axel
Year: 2002
DOI: 10.1109/NANO.2002.1032255
We review our theoretical and experimental work on functional optical devices based on planar photonic crystals. Beside standard photonic applications, these structures can also be used as building blocks of quantum networks.https://authors.library.caltech.edu/records/6bvm9-pd697Finite horizon model reduction and the appearance of dissipation in Hamiltonian systems
https://resolver.caltech.edu/CaltechAUTHORS:BARcdc02
Authors: Barahona, M.; Doherty, A. C.; Sznaier, M.; Mabuchi, H.; Doyle, J. C.
Year: 2002
DOI: 10.1109/CDC.2002.1185095
An apparent paradox in classical statistical physics is the mechanism by which conservative, time-reversible microscopic dynamics, can give rise to seemingly dissipative behavior. In this paper we use system theoretic tools to show that dissipation can arise as an artifact of incomplete observations over a finite horizon. In addition, this approach allows us to obtain finite-time, low order, approximations of systems with moderate size and to establish how the approach to the thermodynamic limit depends on the different physical parameters.https://authors.library.caltech.edu/records/mw2b8-7yx48Experiments in real-time quantum feedback
https://resolver.caltech.edu/CaltechAUTHORS:MABcdc02
Authors: Mabuchi, Hideo
Year: 2002
Recent advances in quantum optics and atomic physics have enabled experimenters to begin exploring realtime feedback in quantum settings. In addition to the practical significance of such work for fields like nanotechnology and quantum information processing, research on quantum feedback probes the fundamental physics of conditional evolution for observed systems. Feedback in quantum settings is generally complicated by the intricacies of 'wave-function collapse' and measurement back-action, so that the proper design of quantum feedback controllers will require accurate quantitative models for the measurement process.https://authors.library.caltech.edu/records/8p9gc-8a998A new physics
https://resolver.caltech.edu/CaltechAUTHORS:DOYcdc02
Authors: Doyle, John; Mabuchi, Hideo
Year: 2002
DOI: 10.1109/CDC.2002.1185093
This session considers the application of mathematics from control theory to several persistent mysteries at the foundations of physics where interconnected, multiscale systems issues arise. In addition to the ubiquity of power laws in natural and man-made systems, these include a new view of turbulence in highly sheared flows that results from design for drag minimization, the origin of macroscopic dissipation and thermodynamic irreversibility in microscopically reversible dynamics, the universality of quantum gates for quantum computing, decoherence minimization in quantum systems, and entanglement witnessing. The latter ones are problems at the heart of several important tasks such as quantum computing, teleportation and quantum key distribution. Much of the original motivation for a new science of complexity came from the hope that methods of theoretical physics could contribute to a theory of complex engineering and biological networks and systems. This collection of work shows that apparently exactly the opposite is true. The role that robust control methods play in this research will be the central theme of this paper, around which the other issues will be woven. The aim is not to provide a control-friendly rederivation of known results in physics, but rather to illustrate through representative examples, how exciting new results and important insight, as assessed by physicists themselves, can be obtained through the mathematics and methods that the control community has developed. Since this work is largely being published in the scientific literature, the controls community may be largely unaware of these developments.https://authors.library.caltech.edu/records/wyzhs-thn68Plenary Panel Discussion: Challenges and opportunities for the future of control
https://resolver.caltech.edu/CaltechAUTHORS:DOYcdc04
Authors: Doyle, John; Carlson, Jean; Cassandras, Christos; Kumar, P. R.; Leonard, Naomi; Mabuchi, Hideo
Year: 2005
This panel reflects the scope and diversity of the unprecedented challenges and opportunities for the systems and controls community that has been created by several research themes from the basic sciences to advanced technologies. Connecting physical processes at multiple time and space scales in quantum, statistical, fluid, and solid mechanics, remains not only a central scientific challenge but also one with increasing technological implications. This is particular so in highly organized and nonequilibrium systems as in biology and nanotechnology, where interconnection, feedback, and dynamics are playing an increasingly central role.https://authors.library.caltech.edu/records/5td71-v5892Mobility Pattern Learning and Route Prediction Based Location Management in PCS Network
https://resolver.caltech.edu/CaltechAUTHORS:20110729-104549652
Authors: Senzaki, Daizuke; Chakraborty, Goutam; Mabuchi, Hiroshi; Matsura, Masafumi
Year: 2006
DOI: 10.1109/AINA.2006.230
Mobile host (MH) has to be tracked in personal communication service (PCS) network, for which update and paging signals are required. The number of PCS network subscribers skyrocketed in recent years. To reuse channels over a distance, cell size is reduced and the number of cell crossing by user is becoming high. That makes optimal use of paging and update signal very important. In fact, most MH has unique movement profile, that contains the information of time, route, direction, etc., which is possible to learn and used to predict location. In this paper, we propose mobility pattern based location management scheme using the movement profile. Mobility pattern is learned and system will page only the restricted probable area. We compared the proposed scheme with distance-based location management. Improved cost saving is achieved.https://authors.library.caltech.edu/records/s1h7m-cqv72Binary quantum receiver concept demonstration
https://resolver.caltech.edu/CaltechAUTHORS:20180709-142651366
Authors: Lau, Chi-Wung; Vilnrotter, Victor A.; Dolinar, Sam; Geremia, J. M.; Mabuchi, Hideo
Year: 2006
DOI: 10.1117/12.660268
An experimental demonstration of a quantum-optimal receiver for optical binary signals, developed as a joint effort by the Jet Propulsion Laboratory and the California Institute if Technology, is described in this article. A brief summary of the classical, quantum-optimal, and quantum near optimal solutions to detecting binary signals is first presented. The components and experimental setup used to implement the receivers is then discussed. Experimental performance and results for both optimal and near-optimal receivers are presented and compared to theoretical limits. Finally, experimental shortcomings are discussed along with possible solutions and future direction.https://authors.library.caltech.edu/records/hfm38-ge198Quantum measurement and feedback control
https://resolver.caltech.edu/CaltechAUTHORS:20190205-161229837
Authors: Bouten, Luc; van Handel, Ramon; Miller, Anthony; Sarma, Gopal; Mabuchi, Hideo
Year: 2007
DOI: 10.1109/cleoe-iqec.2007.4386928
In this paper, an overview of research in quantum control is presented. Examples of work in the first theme include numerous applications of semi-definite programming and relaxation methods in quantum information theory. Examples of the second include applications of feedback control in the development of new receiver designs for quantum-optical telecom. The third theme is just beginning to emerge as an active research area, linking fundamental issues in quantum field theory with new challenges for applied and computational mathematics in non-commutative stochastic analysis and optimization.https://authors.library.caltech.edu/records/ebeyj-x6921