Thomas Purdy
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View article: Quartz phononic crystal resonators for hybrid acoustic quantum memories
Quartz phononic crystal resonators for hybrid acoustic quantum memories Open
Circuit quantum acoustodynamics systems have emerged as a promising platform for quantum information by coupling superconducting qubits to mechanical resonators, with their long-lived mechanical modes serving as quantum memories. We demons…
View article: Back action evasion in optical lever detection
Back action evasion in optical lever detection Open
The optical lever is a centuries old and widely used detection technique employed in applications ranging from consumer products and industrial sensors to precision force microscopes used in scientific research. However, despite the long h…
View article: Back action evasion in optical lever detection
Back action evasion in optical lever detection Open
The optical lever is a centuries old and widely-used detection technique employed in applications ranging from consumer products, industrial sensors to precision force microscopes used in scientific research. However, despite the long hist…
View article: Detecting Acoustic Blackbody Radiation with an Optomechanical Antenna
Detecting Acoustic Blackbody Radiation with an Optomechanical Antenna Open
Nanomechanical systems are generally embedded in a macroscopic environment where the sources of thermal noise are difficult to pinpoint. We engineer a silicon nitride membrane optomechanical resonator such that its thermal noise is acousti…
View article: Beyond spontaneous emission: Giant atom bounded in the continuum
Beyond spontaneous emission: Giant atom bounded in the continuum Open
The quantum coupling of individual superconducting qubits to microwave\nphotons leads to remarkable experimental opportunities. Here we consider the\nphononic case where the qubit is coupled to an electromagnetic surface acoustic\nwave ant…
View article: Detecting Thermal Acoustic Radiation with an Optomechanical Antenna
Detecting Thermal Acoustic Radiation with an Optomechanical Antenna Open
Nanomechanical systems are generally embedded in a macroscopic environment where the sources of thermal noise are difficult to pinpoint. We engineer a silicon nitride membrane optomechanical resonator such that its thermal noise is acousti…
View article: Review Article: Quantum-based vacuum metrology at the National Institute of Standards and Technology
Review Article: Quantum-based vacuum metrology at the National Institute of Standards and Technology Open
The measurement science in realizing and disseminating the unit for pressure in the International System of Units, the pascal (Pa), has been the subject of much interest at the National Institute of Standards and Technology (NIST). Modern …
View article: Quantum-based vacuum metrology at NIST
Quantum-based vacuum metrology at NIST Open
The measurement science in realizing and disseminating the unit for pressure in the International System of Units (SI), the pascal (Pa), has been the subject of much interest at the National Institute of Standards and Technology (NIST). Mo…
View article: Quantum correlations from a room-temperature optomechanical cavity
Quantum correlations from a room-temperature optomechanical cavity Open
Quantum effects in ambient conditions Quantum back action—the “reaction” of a quantum mechanical object to being measured—is normally observed at cryogenic temperatures, where it is easier to distinguish from thermal motion. Purdy et al. m…
View article: Cooling a Harmonic Oscillator by Optomechanical Modification of Its Bath
Cooling a Harmonic Oscillator by Optomechanical Modification of Its Bath Open
Optomechanical systems show tremendous promise for the high-sensitivity sensing of forces and modification of mechanical properties via light. For example, similar to neutral atoms and trapped ions, laser cooling of mechanical motion by ra…
View article: Observation of Optomechanical Quantum Correlations at Room Temperature
Observation of Optomechanical Quantum Correlations at Room Temperature Open
By shining laser light through a nanomechanical beam, we measure the beam's thermally driven vibrations and perturb its motion with optical forces at a level dictated by the Heisenberg measurement-disturbance uncertainty relation. Such qua…
View article: Laser Cooling of a Micromechanical Membrane to the Quantum Backaction Limit
Laser Cooling of a Micromechanical Membrane to the Quantum Backaction Limit Open
The radiation pressure of light can act to damp and cool the vibrational motion of a mechanical resonator, but even if the light field has no thermal component, shot noise still sets a limit on the minimum phonon occupation. In optomechani…