Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Y19: Minisymposium On Quantum Sensors and ComputingLive Mini-Symposium
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Sponsoring Units: DPF Chair: Paolo Calafiura, LBNL |
Tuesday, April 20, 2021 1:30PM - 2:06PM Live |
Y19.00001: Quantum Sensors for Particle Physics Invited Speaker: Reina Maruyama Quantum Sensors leverage quantum phenomena to make measurements by manipulating quantum states, entanglement, and superposition. Many in the particle physics community are exploring the potential for how the applications of quantum technologies will advance our understanding of fundamental physics questions such as measurements of the cosmic microwave background, dark matter direct detection, dark energy, axions, permanent electric dipole moments, and other symmetry violation searches. Technological advances in the measurements of electromagnetic fields, nuclear magnetic resonance, transition edge sensors, SQUIDS, superfluid helium, and other technologies from AMO communities are being explored, leading to a truly multi-disciplinary exploration of technical capabilities. In this talk, I will summarize the status of the field and efforts currently underway. [Preview Abstract] |
Tuesday, April 20, 2021 2:06PM - 2:18PM Live |
Y19.00002: Status of Windchime: Gravitational Direct Detection of Planck Mass Dark Matter Using Quantum-Enhanced Sensors Juehang Qin Attaining sensitivity to the gravitational coupling of dark matter is a holy grail in direct detection experiments. It has been shown that for a region of parameter space around the Planck mass, it is theoretically possible to detect dark matter that solely interacts via gravitation. This is also a well-motivated region of parameter space as new physics is expected around the Planck mass. The Windchime experiment is aimed at the direct detection of dark matter in this parameter space via gravitational couplings alone, using a large array of accelerometers with quantum-enhanced readout. In this talk I will detail the experimental status of a prototype setup, as well as analysis and simulation frameworks. [Preview Abstract] |
Tuesday, April 20, 2021 2:18PM - 2:30PM Live |
Y19.00003: Quantum sensing for axions below 1$\mu $eV Stephen Kuenstner There are compelling reasons to use quantum metrology techniques in axion searches below 1$\mu $eV, which aim to detect electromagnetic signals below 300MHz. Comparatively little work has been done to develop quantum metrology techniques in this frequency range, and well-established techniques like squeezing and photon counting are not useful due to the residual thermal excitations in MHz circuits. In this work we present the RQU, a flexible device that we are developing to enable quantum acceleration in DMRadio-50L, DMRadio-GUT, and other axion searches. The RQU uses Josephson junctions to parametrically upconvert signals from MHz frequencies to microwave frequencies. This upconversion paradigm allows the RQU to take advantage of several mature microwave Circuit QED technologies, including high Q microwave resonators, JPAs, and microwave squeezers. The RQU is optimized for quantum metrology in practical axion searches, with a design that isolates the RQU's microwave drive signals from the axion receiver. The RQU can be operated in a several modes by choosing the frequencies, phases, and amplitudes of the microwave drive signals. A variety of quantum metrology techniques, including sideband cooling, two-mode squeezing, and backaction-evading readout are possible. [Preview Abstract] |
Tuesday, April 20, 2021 2:30PM - 2:42PM Live |
Y19.00004: Searching for Dark Matter with a Superconducting Qubit Akash Dixit, Srivatsan Chakram, Kevin He, Ankur Agrawal, Ravi Naik, David Schuster, Aaron Chou Detection mechanisms for low mass bosonic dark matter candidates, such the axion or hidden photon, leverage potential interactions with electromagnetic fields, whereby the dark matter (of unknown mass) on rare occasion converts into a single photon. Here, we report the development of a novel microwave photon counting technique and a new exclusion limit on hidden photon dark matter. We operate a superconducting qubit to make repeated quantum non-demolition measurements of cavity photons and apply a hidden Markov model analysis to reduce the noise to 15.7 dB below the quantum limit, with overall detector performance limited by a residual background of real photons. With the present device, we perform a hidden photon search and constrain the kinetic mixing angle to $\epsilon \leq 1.82 \times 10^{-15}$ in a band around 6.011 GHz (24.86 $\mu$eV) with an integration time of 8.33 s. This demonstrated noise reduction technique enables future dark matter searches to be sped up by a factor of 1300. By coupling a qubit to an arbitrary quantum sensor, more general sub-SQL metrology is possible with the techniques presented in this work. [Preview Abstract] |
Tuesday, April 20, 2021 2:42PM - 2:54PM Live |
Y19.00005: Dark Matter Signal Enhancement with a Superconducting Qubit Ankur Agrawal, Akash Dixit, Tanay Roy, Srivatsan Chakram, Kevin He, Wenjie Yao, Steven Johnson, Aaron Chou, David Schuster The signal from low mass bosonic dark matter, such as axions or hidden photons, in 5-30 GHz regime is vanishing due to the shrinking detector volume. We propose to enhance the signal rate by initializing the microwave cavity in a large $n$-photon Fock state using the non-linearity of a superconducting qubit. We expect to enhance the signal rate by a factor of at least 10 before being limited by the coherence time of the cavity. Experimental protocol and recent results will be presented to demonstrate this novel technique. [Preview Abstract] |
Tuesday, April 20, 2021 2:54PM - 3:06PM Live |
Y19.00006: Projected cooling in quantum spin models Erik Gustafson I demonstrate a proof of principle application of the quantum computing algorithm, Projected Cooling, for ground state preparation of the transverse Ising model and Abelian Higgs model in (1+1)-dimensions. I also will briefly discuss how the method can be used for lattice gauge theory models in higher dimensions [Preview Abstract] |
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