Engineering topics

Walsworth, Ronald

Publications and source records attributed to Walsworth, Ronald.

5 records

DOE OSTI2024

All-optical, Microwave-free NV-Diamond Magnetometer for Weak Magnetic Field Environments

Sensitive nitrogen-vacancy (NV) magnetometry typically requires a bias field to lift the spin level degeneracy and has commonly utilized microwave sources to selectively manipulate the sensor's spin state. However, this external bias field and microwave sources may perturb the sample of interest or be incompatible with operational conditions. Here, we demonstrate an all-optical, microwave-free NV-diamond magnetometer in the presence of weak or no bias magnetic field (<20 G). We experimentally measure photoluminescence spectra using diamonds with varying NV concentrations; and numerically simulate matching features due to cross-relaxation between NVs. Our results pave the way towards a sensitive probe to study magnetic systems that can be disrupted by microwave signals and can only tolerate weak bias magnetic field.

Ung, Kristine↗

DOE OSTI2023

All-optical, Microwave-free NV-Diamond Magnetometer for High Magnetic Field Environment

Nitrogen vacancy (NV) magnetometry has commonly utilized microwave sources to manipulate the sensor's spin state. However, this technique becomes technically challenging under an environment with a Tesla-scale magnetic field or extreme conditions that prohibit the usage of microwave. By leveraging the effect that an off-axis magnetic field to the NV axis quenches its emitted photoluminescence, we present an all-optical, microwave-free broadband quantum diamond magnetometer. We demonstrate magnetic sensing over an extended bias magnetic field range — beyond the ground-state level anti-crossing (GSLAC) region — with a more integrated design.

Zheng, Xiechen↗

DOE OSTI2021

Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies

Just as “classical” information technology rests on a foundation built of interconnected information-processing systems, quantum information technology (QIT) must do the same. A critical component of such systems is the “interconnect,” a device or process that allows transfer of information between disparate physical media, for example, semiconductor electronics, individual atoms, light pulses in optical fiber, or microwave fields. While interconnects have been well engineered for decades in the realm of classical information technology, quantum interconnects (QuICs) present special challenges, as they must allow the transfer of fragile quantum states between different physical parts or degrees of freedom of the system. The diversity of QIT platforms (superconducting, atomic, solid-state color center, optical, etc.) that will form a “quantum internet” poses additional challenges. As quantum systems scale to larger size, the quantum interconnect bottleneck is imminent, and is emerging as a grand challenge for QIT. For these reasons, it is the position of the community represented by participants of the NSF workshop on “Quantum Interconnects” that accelerating QuIC research is crucial for sustained development of a national quantum science and technology program. Given the diversity of QIT platforms, materials used, applications, and infrastructure required, a convergent research program including partnership between academia, industry, and national laboratories is required.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗

DOE OSTI2021

Opportunities for DOE National Laboratory-led QuantISED Experiments

A subset of QuantISED Sensor PIs met virtually on May 26, 2020 to discuss a response to a charge by the DOE Office of High Energy Physics. In this document, we summarize the QuantISED sensor community discussion, including a consideration of HEP science enabled by quantum sensors, describing the distinction between Quantum 1.0 and Quantum 2.0, and discussing synergies/complementarity with the new DOE NQI centers and with research supported by other SC offices. Quantum 2.0 advances in sensor technology offer many opportunities and new approaches for HEP experiments. The DOE HEP QuantISED program could support a portfolio of small experiments based on these advances. QuantISED experiments could use sensor technologies that exemplify Quantum 2.0 breakthroughs. They would strive to achieve new HEP science results, while possibly spinning off other domain science applications or serving as pathfinders for future HEP science targets. QuantISED experiments should be led by a DOE laboratory, to take advantage of laboratory technical resources, infrastructure, and expertise in the safe and efficient construction, operation, and review of experiments. The QuantISED PIs emphasized that the quest for HEP science results under the QuantISED program is distinct from the ongoing DOE HEP programs on the energy, intensity, and cosmic frontiers. There is robust evidence for the existence of particles and phenomena beyond the Standard Model, including dark matter, dark energy, quantum gravity, and new physics responsible for neutrino masses, cosmic inflation, and the cosmic preference for matter over antimatter. Where is this physics and how do we find it? The QuantISED program can exploit new capabilities provided by quantum technology to probe these kinds of science questions in new ways and over a broader range of science parameters than can be achieved with conventional techniques.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗

NASA NTRS2003

Bound on Lorentz and CPT Violating Boost Effects for the Neutron

A search for a sidereal annual variation in the frequency difference between co-located Xe-129 and He-3 Zeeman masers sets a limit of approximately 10(exp -27) GeV on the coupling of the neutron to the time component of a possible background Lorentz and CPT violating tensor field.

Walsworth, Ronald↗