Bonny L. Schumaker | |
---|---|
Alma mater | California Institute of Technology |
Scientific career | |
Institutions | Jet Propulsion Laboratory |
Thesis | Theoretical Investigations in Nonlinear Quantum Optics, Theory of Measurement, and Pulsations of General Relativistic Models of Neutron Stars (1985) |
Doctoral advisor | Kip Thorne |
Bonny Laura Schumaker (born 1953) is an American physicist and pilot who worked on the LISA Pathfinder. In 2010 she founded the nonprofit "On Wings of Care", a charity which protects animals and environments. [1]
Schumaker was born and raised in Wisconsin, near Lake Michigan. [2] She wanted to be a vet but was awarded a scholarship to study physics at the California Institute of Technology. She loved mathematics, and continued at the California Institute of Technology for her graduate studies, earning a PhD in 1985. [3] She worked under the supervision of Kip Thorne. [3] Over six papers, her PhD thesis considered theoretical investigations into nonlinear quantum optics. [4] She developed the mathematical theory of torsional oscillations in fully relativistic spherical stellar models and worked on homodyne detection. [4] [5] Her work considered two-photon physics using quadrature phase amplitudes, a technique now known as the Caves–Schumaker formalism, which has become a standard mathematical tool in optomechanics, quantum optics and gravitational wave science. [6] [7] [8] She worked at Caltech as a postdoctoral research fellow for a year, before moving to the Jet Propulsion Laboratory in 1986. [9] In 1988 she was awarded the Maria Goeppert-Mayer Award for her contributions to quantum optics. [10] [11] [12] Schumaker trained as a pilot in 1996 and flew for Continental Airlines. [13] She became a Federal Aviation Administration instructor in the mid nineties. She developed the Precision Optical INTerferometer in space (POINTS) that was proposed for the ASEPS-1 mission. [14] [15]
Schumaker conceptualised the LISA Pathfinder experiment at the Jet Propulsion Laboratory. [16] [17] [18] She worked in the design and development team of the interferometer. [2] [19] [20] [21] [22] By 2008 Schumaker had completed three mock data challenges, demonstrating the ability of the device to deal with the Galactic foreground and achieve accurate recovery of EMRI signals. [23] The pathfinder contains six gold-platinum cube proof masses, and Schumaker predicted that "a nudge equivalent to the air pressure from a human whisper 40 kilometers away would tip a cube out of whack". [24] She worked on a new technique to monitor changes in carbon found in soil; combining field-delineated spatial units, remote sensing, soil residues and simulations models. [25] [26] Schumaker retired from the Jet Propulsion Laboratory in 2011. [13]
Schumaker founded the nonprofit "On Wings of Care" in 2010, which looks to promote the welfare of animals. Schumaker uses her skills as a pilot to assess animal habitats, helping with rescues and rehabilitation. She joined the Board of Directors of the Sea Shepherd Conservation Society. [27] Since the Deepwater Horizon oil spill in 2010, Schumaker has flown over the Gulf of Mexico for over 600 hours, locating and protecting animals. [28] [29] She flies a Cessna called "Bessie". [2] She is often the first responder for pollution incidents. [28] In August 2011 she identified oil globules on the surface of the ocean which had erupted from the broken well of Deepwater Horizon . [2] [30] She published the book The Story of Pellie Lou: A Pelican Who Survived the Gulf of Mexico Oil Spill in 2015. [31] She has returned to the oil spill with various news organisations, and supported the local community in seeking justice. [32] [33] [34] [35] In 2018 she flew over the coastline of Louisiana to evaluate the fallout from Hurricane Katrina. [36] She has since studied hydrocarbon seepage in the Mississippi Canyon. [37]
The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory designed to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool. Two large observatories were built in the United States with the aim of detecting gravitational waves by laser interferometry. These observatories use mirrors spaced four kilometers apart which are capable of detecting a change of less than one ten-thousandth the charge diameter of a proton.
In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Physical sources are not strictly monochromatic: they may be partly coherent. Beams from different sources are mutually incoherent.
The Laser Interferometer Space Antenna (LISA) is a planned space probe to detect and accurately measure gravitational waves—tiny ripples in the fabric of spacetime—from astronomical sources. LISA will be the first dedicated space-based gravitational-wave observatory. It aims to measure gravitational waves directly by using laser interferometry. The LISA concept has a constellation of three spacecraft arranged in an equilateral triangle with sides 2.5 million kilometres long, flying along an Earth-like heliocentric orbit. The distance between the satellites is precisely monitored to detect a passing gravitational wave.
In physics, a squeezed coherent state is a quantum state that is usually described by two non-commuting observables having continuous spectra of eigenvalues. Examples are position and momentum of a particle, and the (dimension-less) electric field in the amplitude and in the mode of a light wave. The product of the standard deviations of two such operators obeys the uncertainty principle:
In theoretical physics, Euclidean quantum gravity is a version of quantum gravity. It seeks to use the Wick rotation to describe the force of gravity according to the principles of quantum mechanics.
In physics, the Hanbury Brown and Twiss (HBT) effect is any of a variety of correlation and anti-correlation effects in the intensities received by two detectors from a beam of particles. HBT effects can generally be attributed to the wave–particle duality of the beam, and the results of a given experiment depend on whether the beam is composed of fermions or bosons. Devices which use the effect are commonly called intensity interferometers and were originally used in astronomy, although they are also heavily used in the field of quantum optics.
The Caltech Submillimeter Observatory (CSO) was a 10.4-meter (34 ft) diameter submillimeter wavelength telescope situated alongside the 15-meter (49 ft) James Clerk Maxwell Telescope (JCMT) at Mauna Kea Observatories. It was engaged in submillimeter astronomy, of the terahertz radiation band. The telescope closed on September 18, 2015.
The Palomar Testbed Interferometer (PTI) was a near infrared, long-baseline stellar interferometer located at Palomar Observatory in north San Diego County, California, United States. It was built by Caltech and the Jet Propulsion Laboratory and was intended to serve as a testbed for developing interferometric techniques to be used at the Keck Interferometer. It began operations in 1995 and achieved routine operations in 1998, producing more than 50 refereed papers in a variety of scientific journals covering topics from high precision astrometry to stellar masses, stellar diameters and shapes. PTI concluded operations in 2008 and has since been dismantled.
An atom interferometer is an interferometer which uses the wave character of atoms. Similar to optical interferometers, atom interferometers measure the difference in phase between atomic matter waves along different paths. Today, atomic interference is typically controlled with laser beams. Atom interferometers have many uses in fundamental physics including measurements of the gravitational constant, the fine-structure constant, the universality of free fall, and have been proposed as a method to detect gravitational waves. They also have applied uses as accelerometers, rotation sensors, and gravity gradiometers.
GEO600 is a gravitational wave detector located near Sarstedt, a town 20 km to the south of Hanover, Germany. It is designed and operated by scientists from the Max Planck Institute for Gravitational Physics, Max Planck Institute of Quantum Optics and the Leibniz Universität Hannover, along with University of Glasgow, University of Birmingham and Cardiff University in the United Kingdom, and is funded by the Max Planck Society and the Science and Technology Facilities Council (STFC). GEO600 is capable of detecting gravitational waves in the frequency range 50 Hz to 1.5 kHz, and is part of a worldwide network of gravitational wave detectors. This instrument, and its sister interferometric detectors, when operational, are some of the most sensitive gravitational wave detectors ever designed. They are designed to detect relative changes in distance of the order of 10−21, about the size of a single atom compared to the distance from the Sun to the Earth. Construction on the project began in 1995.
Quantum metrology is the study of making high-resolution and highly sensitive measurements of physical parameters using quantum theory to describe the physical systems, particularly exploiting quantum entanglement and quantum squeezing. This field promises to develop measurement techniques that give better precision than the same measurement performed in a classical framework. Together with quantum hypothesis testing, it represents an important theoretical model at the basis of quantum sensing.
An astronomical interferometer or telescope array is a set of separate telescopes, mirror segments, or radio telescope antennas that work together as a single telescope to provide higher resolution images of astronomical objects such as stars, nebulas and galaxies by means of interferometry. The advantage of this technique is that it can theoretically produce images with the angular resolution of a huge telescope with an aperture equal to the separation, called baseline, between the component telescopes. The main drawback is that it does not collect as much light as the complete instrument's mirror. Thus it is mainly useful for fine resolution of more luminous astronomical objects, such as close binary stars. Another drawback is that the maximum angular size of a detectable emission source is limited by the minimum gap between detectors in the collector array.
The Virgo interferometer is a large Michelson interferometer designed to detect the gravitational waves predicted by general relativity. It is located in Santo Stefano a Macerata, near the city of Pisa, Italy. The instrument's two arms are three kilometres long, housing its mirrors and instrumentation inside an ultra-high vacuum.
Carlton Morris Caves is an American theoretical physicist. He is currently professor emeritus and research professor of physics and astronomy at the University of New Mexico. Caves works in the areas of physics of information; information, entropy, and complexity; quantum information theory; quantum chaos, quantum optics; the theory of non-classical light; the theory of quantum noise; and the quantum theory of measurement. He is a Fellow of the American Physical Society and of the American Association for the Advancement of Science and is a member of the US National Academy of Sciences.
Francisco Javier "Frank" Duarte is a laser physicist and author/editor of several books on tunable lasers.
The N-slit interferometer is an extension of the double-slit interferometer also known as Young's double-slit interferometer. One of the first known uses of N-slit arrays in optics was illustrated by Newton. In the first part of the twentieth century, Michelson described various cases of N-slit diffraction.
A common-path interferometer is a class of interferometers in which the reference beam and sample beams travel along the same path. Examples include the Sagnac interferometer, Zernike phase-contrast interferometer, and the point diffraction interferometer. A common-path interferometer is generally more robust to environmental vibrations than a "double-path interferometer" such as the Michelson interferometer or the Mach–Zehnder interferometer. Although travelling along the same path, the reference and sample beams may travel along opposite directions, or they may travel along the same direction but with the same or different polarization.
Continuous-variable (CV) quantum information is the area of quantum information science that makes use of physical observables, like the strength of an electromagnetic field, whose numerical values belong to continuous intervals. One primary application is quantum computing. In a sense, continuous-variable quantum computation is "analog", while quantum computation using qubits is "digital." In more technical terms, the former makes use of Hilbert spaces that are infinite-dimensional, while the Hilbert spaces for systems comprising collections of qubits are finite-dimensional. One motivation for studying continuous-variable quantum computation is to understand what resources are necessary to make quantum computers more powerful than classical ones.
Alan David White was an American physicist, known primarily as one of the inventors of the visible helium-neon laser.
Rana X. Adhikari is an American experimental physicist. He is a professor of physics at the California Institute of Technology (Caltech) and an associate faculty member of the International Centre for Theoretical Sciences of Tata Institute of Fundamental Research (ICTS-TIFR).
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