The Indian Species of Mimosa

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Adiabatic two-qubit gates in capacitively coupled quantum dot hybrid qubits

The ability to tune qubits to flat points in their energy dispersions ("sweet spots") is an important tool for mitigating the effects of charge noise and dephasing in solid-state devices. However, the number of derivatives that must be simultaneously set to zero grows exponentially with the number of coupled qubits, making the task untenable for as few as two qubits. This is a particular problem for adiabatic gates, due to their slower speeds. Here, we propose an adiabatic two-qubit gate for quantum dot hybrid qubits, based on the tunable, electrostatic coupling between distinct charge configurations. We confirm the absence of a conventional sweet spot, but show that controlled-Z (CZ) gates can nonetheless be optimized to have fidelities of $\sim$99% for a typical level of quasistatic charge noise ($\sigma_\varepsilon$$\simeq$1 $\mu$eV). We then develop the concept of a dynamical sweet spot (DSS), for which the time-averaged energy derivatives are set to zero, and identify a simple pulse sequence that achieves an approximate DSS for a CZ gate, with a 5$\times$ improvement in the fidelity. We observe that the results depend on the number of tunable parameters in the pulse sequence, and speculate that a more elaborate sequence could potentially attain a true DSS.Comment: 14 pages, 9 figure

Gamble mode: Resonance contact mode in atomic force microscopy

Active noise reduction has been accomplished in atomic force microscopy by applying a high frequency, low amplitude vibration to the cantilever while it is in contact with a surface. The applied excitation (>~ 200 kHz; ~ 1 nm) is acoustically coupled to the tip and dampens the resonance Q factors of the system. The applied frequency is well above the bandwidth of the acquisition system (50 kHz). We call this mode "gamble mode" or "resonance contact.

Noise reduction in atomic force microscopy: Resonance contact mode

Noise reduction has been accomplished in atomic force microscopy by applying a high frequency, low amplitude vibration to the cantilever while it is in contact with a surface. The applied excitation (>~200 kHz; ~1 nm) is acoustically coupled to the tip and dampens the resonance Q factors of the system. The applied frequency is well above the bandwidth of the acquisition system (50 kHz). We call this mode "resonance contact" mode. The nonlinear behavior of the tip–sample interaction allows the high frequency excitation to effectively broaden the frequency response of the system resonances

Set design for A Raisin in the Sun

My husband and I chose to go to Walt Disney World for our honeymoon, because of his interest in animation. When we arrived the world that surrounded us was fascinating. It was amazing and strange how, for the time we were there, this fantasy land became a form of reality for us. While at Walt Disney World, I became very interested in set design. The environments created within Disney World allowed one to be entertained and amused, while traveling through dream lands. Being able to design with this kind of playfulness is very stimulating to me. Upon returning home from Disney World, I began my education at Rochester Institute of Technology (R.I.T). I was introduced to many new technical skills, which I never had the opportunity to learn, during my Fine Arts education. Throughout the year I struggled with these technical skills, and as the year came to a close I understood the necessity for them. However, I still lacked the emotional playfulness that I was exposed to while visiting Disney World. With that in mind I began thinking about my thesis. I wanted to create a three dimensional environment unlike any I had created during my stay at R.I.T. When I was discussing various thesis topics with my advisor, she suggested designing a stage set for a local theatre in Rochester. I was thrilled with the suggestion

Remotely controlled mirror of variable geometry for small angle x-ray diffraction with synchrotron radiation

A total-reflecting mirror of 120-cm length was designed and built to focus synchrotron radiation emanating from the electron-positron storage ring at the Stanford Linear Accelerator Center (SPEAR). The reflecting surface is of unpolished float glass. The bending and tilt mechanism allows very fine control of the curvature and selectability of the critical angle for wavelengths ranging from 0.5 to 3.0 Å. Elliptical curvature is used to minimize aberrations. The mirror is placed asymmetrically onto the ellipse so as to achieve a tenfold demagnification of the source. The bending mechanism reduces nonelastic deformation (flow) and minimizes strains and stresses in the glass despite its length. Special design features assure stability of the focused image. The mirror reduces the intensity of shorter wavelength harmonics by a factor of approximately 100

A remembrance of things (best) forgotten: The 'allegorical past' and the feminist imagination

This is the author's PDF version of an article published in Feminist theology© 2012. The definitive version is available at http://fth.sagepub.com/This article discusses the US TV series Mad Men, which is set in an advertising agency in 1960s New York, in relation to two key elements which seem significant for a consideration of the current state of feminism in church and academy, both of which centre around what it means to remember or (not) to forget

Trekking to the Tenure Finish Line: Teacher Educators and the Power of Peer Mentoring at an HBCU

The educator\u27s primary goal is to ensure student success by offering dynamic student experiences that will allow the students to synthesize their new learning with hopes of practical application. In higher education, a professor can easily fall into working in isolation due to the uniqueness of course offerings and areas of professional interest. However, when professors consciously build professional peer-mentoring relationships with colleagues that have similar interests and core values, both professors can grow. For example, when an experienced tenure track professor with K12 experience partners with a novice tenure track professor with over a decade of experience in education leadership, wonderful things can happen. This article details the first- and fifth-year experiences of two tenure track professors at an Historically Black College and University (HBCU) in the mid-Atlantic region. Instruction and scholarship, work-life balance, and relationships with students are areas of impact as an outcome of this peer-mentoring relationship

Detection of trace peroxide explosives in environmental samples using solid phase extraction and liquid chromatography mass spectrometry

This paper presents solid phase extraction (SPE) and liquid chromatography-mass spectrometry (LC-MS) methods for the trace detection of the peroxide explosives triacetone triperoxide (TATP) and hexamethylene triperoxide diamine (HMTD). Furthermore, experimental studies use these methods to explore the efficiency of wastewater treatment plant (WWTP) processes at removing trace levels of peroxide explosives from water samples to assess the application of the developed methods for the detection of explosives in the environment. The principal results of this study showed that the greatest removal of TATP and HMTD from spiked water samples occurred following the biological treatment stage, however, the WWTP processing did not completely remove all of the analytes from the water suggesting that such chemicals could contaminate downstream river water samples. The toxicity of chemical pollutants is often determined by their concentration, however, even at trace levels, the monitoring of explosives in the natural environment could be extremely informative for the detection of criminal activity as well as long term effects upon aquatic life. These findings also have significant implications for crime prevention and disruption approaches that can use this type of data as intelligence to guide investigations regarding the source and attribution of detected explosives