Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Y39: Quantum Dots and Vacancy CentersFocus Recordings Available

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Sponsoring Units: DQI Chair: Yuxin Wang, University of Chicago Room: McCormick Place W196A 
Friday, March 18, 2022 8:00AM  8:36AM 
Y39.00001: Quantum control of SnV spin qubits in diamond Invited Speaker: Mete Atature

Friday, March 18, 2022 8:36AM  8:48AM 
Y39.00002: Probing the Variation of the Intervalley Tunnel Coupling in a Silicon Triple Quantum Dot Felix F Borjans, Xuanzi Zhang, Xiao Mi, Guangming Cheng, Nan Yao, Jason R Petta The “valley splitting” of the two lowestlying valleys in silicon quantum wells is known to be sensitive to atomic scale disorder. A large valley splitting is desirable to have a welldefined spin qubit. In addition, an understanding of the intervalley tunnel coupling that couples different valleys in adjacent quantum dots is extremely important, as the resulting gaps in the energylevel diagram may affect the fidelity of charge and spintransfer protocols in silicon quantumdot arrays. We use microwave spectroscopy to probe variations in the valley splitting, and the intra and intervalley tunnel couplings (t_{ij} and t_{ij}’) that couple dots i and j in a triple quantum dot. We uncover large variations of t_{ij}’/t_{ij} and linear scaling of t_{ij}’ with t_{ij}, as expected from theory. The results indicate strong interactions between different valley states on neighboring dots, which we attribute to local inhomogeneities in the silicon quantum well. 
Friday, March 18, 2022 8:48AM  9:00AM 
Y39.00003: MeasurementBased Entanglement Protocol for CavityCoupled Silicon Spin Qubits Remy L Delva, Jason R Petta Measurementbased entanglement (MBE) allows for the preparation of entangled qubits without a need for direct coupling between those qubits. MBE has been demonstrated using superconducting qubits coupled to a microwave cavity [1]. Spin photon interactions [2] and resonant cavitymediated spinspin interactions [3] have been demonstrated with silicon spin qubits in a circuit quantum electrodynamics architecture. Here we theoretically examine the feasibility of using MBE protocols to generate longranged entanglement of electron spins. We use the method of quantum trajectories to simulate the evolution of two qubits and a cavity subjected to a continuous homodyne parity measurement. From these simulations, we determine what device parameter modifications and microwave readout efficiencies are required to perform an MBE experiment with silicon spin qubits. 
Friday, March 18, 2022 9:00AM  9:12AM 
Y39.00004: Excitedstate spectroscopy of a quantum dot hybrid qubit via modulated longitudinal coupling to a 3Dintegrated resonator Benjamin Harpt, Joelle J Corrigan, Nathan S Holman, Rusko Ruskov, Piotr Marciniec, Danna Rosenberg, Dillon C Yost, Jonilyn L Yoder, Rabindra Das, William D Oliver, Robert McDermott, Mark G Friesen, Charles Tahan, Mark A Eriksson Coupling semiconductor quantum dot qubits to superconducting resonators enables reduced control line readout and longdistance qubit interaction [14]. Such functionality relies on electronphoton coupling which is typically thought to be dominated by a transverse Hamiltonian term. Readout via transverse resonator coupling has been extensively studied for both semiconducting and superconducting qubits; however, there exist other coupling mechanisms that affect qubitresonator interaction under certain operating regimes [56]. Here, we demonstrate enhanced transmission through a 3Dintegrated TiN resonator coupled to a Si/SiGe quantum dot hybrid qubit by modulating doubledot detuning at the resonator frequency. We attribute the boosted signal to a dynamical longitudinal coupling term in the qubitresonator Hamiltonian. We perform pulsed spectroscopy of the qubit states, demonstrating that dynamical longitudinal coupling can be a powerful tool for resonatorqubit readout. 
Friday, March 18, 2022 9:12AM  9:48AM 
Y39.00005: Towards a Quantum Internet: Status, Challenges and Progress Invited Speaker: Ronald Hanson Future quantum networks [1] may harness the unique features of entanglement in a range of exciting applications, such as blind quantum computation, secure communication, enhanced metrology for astronomy and timekeeping as well as fundamental investigations. To fulfill these promises, a strong worldwide effort is ongoing to gain precise control over the full quantum dynamics of multiparticle nodes and to wire them up using quantumphotonic channels. 
Friday, March 18, 2022 9:48AM  10:00AM 
Y39.00006: Hamiltonian Reconstruction through Polarimetry of HighOrder Sidebands from Quasiparticles Recollisions Seamus O'Hara, Joseph B Costello, Qile Wu, Kenneth W West, Loren N Pfeiffer, Mark S Sherwin In condensed matter systems, effective Hamiltonians describe the lowenergy physics of quasiparticles. Engineering hybrid systems theorized to host interesting topological states requires knowledge of certain effective Hamiltonian parameters. Reconstructing these effective Hamiltonians from experimental data is difficult, as it normally involves fitting multiparameter theoretical models to a few experimentally measured quantities. We present Hamiltonian Reconstruction by Polarimetry of HighOrder Sidebands (HaRPHOS) as a potential new method to meet this experimental challenge. HaRPHOS provides an optical method to create quasiparticle pairs, accelerate them out of equilibrium, and measure the polarization of emitted light from their recollisions. Information about the quasiparticles’ quantum mechanical phases, both dynamic and topological, is imprinted on the sideband polarizations. Recently, polarimetry of highorder sidebands has been used to reconstruct the Bloch wavefunctions of holes in gallium arsenide (GaAs) [1]. In this talk, we will discuss progress towards demonstrating HaRPHOS by reconstructing the Luttinger Hamiltonian for holes in GaAs, and prospects for applying HaRPHOS to other charged quasiparticles. 
Friday, March 18, 2022 10:00AM  10:12AM 
Y39.00007: Strong longitudinal (curvature) couplings for encoded spin qubits near charge degeneracy Rusko Ruskov, Charles Tahan Typically, encoded spin qubits such as DQD ST qubit, TQD AEON qubit, etc. exhibit strong transverse (dipole) coupling at or near charge degeneracy, which is used to couple to a superconducting resonator in the dispersive regime to perform quantum measurements or gates. Here we theoretically show, see Refs. [1,2], that at or near charge degeneracy there might appear a comparable or even stronger longitudinal (energy curvature) couplings with implications for improved quantum measurements. Nonadiabatic corrections to this picture are also discussed. 
Friday, March 18, 2022 10:12AM  10:24AM Withdrawn 
Y39.00008: Theory of spinorbit mediated hole spinphoton coupling in lateral Ge/SiGe quantum dots Vanita Srinivasa, Rupert M Lewis, Lisa A Tracy, TzuMing Lu, Mitchell I Brickson, Dwight R Luhman Coupling semiconductor spin qubits to microwave photons enables longrange quantum information transfer, and strong spinphoton coupling has recently been demonstrated for electron spin qubits in silicon [1, 2]. In this context, hole spin qubits in lateral Ge/SiGe quantum dots [3, 4] represent an attractive alternative platform without valley degeneracy and with strong intrinsic spinorbit interaction. We present an analytical formulation of heavy hole spinphoton coupling mediated by spinorbit interaction in lateral Ge/SiGe quantum dots. Using this formalism, we derive expressions for effective singlephoton and threephoton coupling within this system and explore the strengths of these interactions in experimentally relevant parameter regimes. 
Friday, March 18, 2022 10:24AM  10:36AM 
Y39.00009: Coupling a highimpedance resonator to crystalphase defined quantum dots in a zincblende InAs nanowire Jann H Ungerer, Alessia Pally, Artem Kononov, Sebastian Lehmann, Joost Ridderbos, Roy Haller, Luk Y Cheung, Ville F Maisi, Claes Thelander, Kimberly A Dick, Andreas Baumgartner, Christian Schonenberger Superconducting microwave resonators are commonly used for creating longrange entanglement between superconducting qubits. Only recently, resonators have been coherently coupled to semiconductor spin qubits. However, state of the art architectures rely on an artificial spinorbit interaction (SOI) introduced by micro magnets. Additionally, electrostatic gates are used for defining double quantum dots (DQDs) that host spin qubits. These requirements complicate device architectures and scaleup. 
Friday, March 18, 2022 10:36AM  10:48AM 
Y39.00010: Cavity QED with hybrid quantumdot donor systems Jonas Mielke, Jason R Petta, Guido Burkard Nuclear spins are promising for quantum information applications due to their long coherence times. However, the underlying good isolation from the environment is a challenge for readout and the implementation of mutual interactions between them. 
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