Rydberg atoms for molecular physics and field sensing
Abstract: Neutral atoms in highly-excited Rydberg states are actively utilized in a variety of research directions such as ultracold chemistry and many-body physics, precision measurements and emerging quantum technologies. This talk is focused on using Rydberg atoms for creating long-range molecular states and for sensing AC/DC electric fields. First, I will present a novel type of Rydberg dimer formed through long-range electric-multipole interactions between a Rydberg atom and an ion. Its vibrational spectra and stability against nonadiabatic effects will be discussed.
Disorder pinning of a composite fermion quasiparticle and FQH plateau transitions
Abstract: Composite fermion wavefunctions describe a one to one correspondence between the low energy properties of the FQH and the IQH phases which has been tested extensively in experiments and through numerical studies [1]. Here we consider the FQH state in the presence of a weak disorder potential. The full many-body problem is numerically difficult [2,3] but the effective Hamiltonian of a single quasiparticle can numerically be calculated in a weak disorder regime; and here we find a one to one correspondence between the FQH and the IQH systems [4].
Strong Coupling of Single Atoms in Optical Tweezers to a Fiber Cavity: Novel approaches to Cavity-Mediated Entanglement
Abstract: Neutral atom quantum processors can greatly benefit from integration with optical cavities. These optical interfaces can be used for fast readout for real time error detection and as a quantum networking node to entangle distant quantum processors. Here we present one candidate for such integration: a Fabry-Perot Fiber Cavity (FPFC). This system is compatible with optical tweezer arrays and enables strong coupling of multiple atoms with a single cavity mode.
Building a quantum internet with photons and electron spins
Abstract: How do we get quantum systems to ‘talk’ to each other? How can we distribute entanglement at global scales? I will describe our work tackling these challenges by using light as a robust mediator of quantum interactions between matter qubits. First, I overview the development of optically-active electron spins in silicon carbide as a platform to realize long-distance quantum links. These qubits uniquely combine world-record spin coherence, noiseless single photon emission, and nanophotonic device integration- all in a wafer-scale semiconductor.
It ain’t just a detector: A new class of optical sensors based on Optoelectronic Chromatic Dispersion in photodiodes
Abstract: Light is essential for life as we know it, and the ubiquitous PN-junction is the pervasive light sensor, whether for optical detection or for energy harvesting. Since its inception over 70 years ago, the physics behind the photodiode is now well understood, including its dependence on the illumination wavelength. However, there is a further prominent feature of photodiodes that has been largely overlooked. These devices can exhibit significant and tunable chromatic dispersion, which we call Optoelectronic Chromatic Dispersion (OED).
Optical quantum memory with processing capabilities
Abstract: Optical quantum memories can be used for storage or generation and subsequent retrieval of quantum light for the purpose of long-distance quantum communication. However, it is beneficial to consider more functions of quantum memories, which may then become parts of more complex hybrid quantum networks. In my works I have demonstrated protocols for spin-wave processing based on interference in multiplexed optical quantum memories [1,2].
Hidden time-reversal symmetry, quantum detailed balance, and exactly-solvable driven-dissipative quantum systems
Abstract: "In this talk, we discuss a new kind of symmetry that underlies a wide class of driven-dissipative quantum systems, a *hidden time-reversal symmetry*. This symmetry represents a generalization of the notion of “detailed balance” that is fully applicable to truly quantum systems. The introduction of this symmetry resolves the problem of how to usefully define “detailed balance” in a quantum setting (a problem that has been studied since the early 70’s by AMO physicists).
Photon-photon interactions in a nonlinear photonic circuit
Abstract: Interaction between individual photons forms the foundation of gate-based optical quantum computing among other quantum-enabled technologies. Quantum emitter-mediated photon interactions are fundamentally constrained by stringent operation conditions and the available photon wavelength and bandwidth, posing difficulty in upscaling and practical applications.
The Quantum Pascal: Realizing the SI-unit for pressure using Fabry-Perot based refractometry
Abstract: Fabry-Perot based refractometry is a powerful technique for pressure assessments that, due to the recent redefinition of the SI system, offers a new route to realizing the SI unit of pressure, the Pascal. In the talk, I will provide a short introduction to pressure metrology and attempt to explain the basics of Fabry-Perot based refractometry and how it can be used to realize the Pascal.
Chemistry, one quantum state at a time -- reaction and spectroscopy with ultracold molecules
Abstract: Over the past decade, advances in atomic, molecular, and optical (AMO) physics techniques enabled the cooling of simple molecules down to the ultracold regime (< 1 mK), allowing unprecedented control over their quantum states. This opened a host of new opportunities in quantum information, precision measurement, and controlled chemistry. I will discuss two experiments on precisely probing and controlling inter- and intramolecular dynamics at ultralow temperatures, respectively.