Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session L11: Materials for Quantum Information Science -- Engineering Quantum StatesFocus
|
Hide Abstracts |
Sponsoring Units: DMP DCMP FIAP Chair: Mark Gyure, HRL Laboratories, LLC Room: BCEC 152 |
Wednesday, March 6, 2019 11:15AM - 11:27AM |
L11.00001: InSb Nanowires for Quantum Devices Ghada Badawy, Sasa Gazibegovic, Sebastian Heedt, Francesco Borsoi, Sebastian Koelling, Marcel Verheijen, Leo P Kouwenhoven, Erik P. A. M. Bakkers Indium-antimonide (InSb) nanowires (NWs) are considered prime candidates for hosting topological states, known as Majorana zero modes, a key ingredient for future fault-tolerant quantum computing. More specifically, the properties of InSb, such as its high electron mobility and strong spin-orbit coupling, grant it with the ability to deliver stringent requirements needed for bearing topological phases when combined with a superconductor. |
Wednesday, March 6, 2019 11:27AM - 11:39AM |
L11.00002: In-plane Selective Area InSb Networks for Scalable Majorana Devices Roy Op het Veld, Di Xu, Marcel Verheijen, Mihir Pendharkar, Joon Sue Lee, Stan Peters, Sebastian Koelling, Leo P Kouwenhoven, Chris Palmstrom, Hao Zhang, Erik P. A. M. Bakkers Theoretical proposals predict that networks of Indium Antimonide (InSb) nanowires are suitable for Majorana based quantum computing. |
Wednesday, March 6, 2019 11:39AM - 11:51AM |
L11.00003: Fabrication and Characterization of Template-Defined Scalable InAs Nanowire Networks Kristopher Cerveny, Martin Friedl, Taras Patlatiuk, Christian Scheller, Lorin Dirscherl, Didem Dede, Anna Fontcuberta i Morral, Dominik Zumbuhl Semiconductor nanowires with strong Rashba-type spin-orbit interaction are a great platform to create and study novel quasiparticles, such as Majorana- and para-fermions. These excitations with non-Abelian statistics are of fundamental interest offering promising applications in topological quantum computing. Here, we report recent results on templated InAs nanowire networks grown on GaAs nanomembranes[1]. A fabrication process for contacting, encapsulation in an ALD dielectric, and electrostatic gating of wires grown on [111] and [100] GaAs substrates has been developed and implemented. The low-temperature conductance behavior of the devices has been analyzed as a function of applied magnetic field and gate voltage. The investigation aims at fundamental system properties like mean free path, coherence length, and spin-orbit length. Further, transport behavior over junctions between the nanowires - enabled by the crystal-lattice symmetries - has been explored. The work lays the foundation for the integration of superconductors in the devices, which provides a means for studying the behavior of hybrid structures with strong spin-orbit interaction. |
Wednesday, March 6, 2019 11:51AM - 12:27PM |
L11.00004: Scalable quantum photonics using quantum dots Invited Speaker: Edo Waks
|
Wednesday, March 6, 2019 12:27PM - 12:39PM |
L11.00005: Improved control of quantum dots in Ge/SiGe quantum wells for spin qubit applications Will Hardy, Yi-Hsin Su, Yen Chuang, Leon Maurer, Mitchell Brickson, Andrew Baczewski, Jiun-Yun Li, Tzu-Ming Lu, Dwight R Luhman Much work on semiconductor spin qubits has focused on extending capabilities and understanding limitations of Si andGaAs.In parallel,alternative materials are being scrutinized for potential advantages in terms of coherence times,control,and extensibility,without sacrificing key features.One such quantum well system,undoped strained Ge/SiGe,appears promising as a candidate spin qubit host due to low disorder,small hole effective mass, and large spin-orbit coupling,and has already been used to demonstrate basic single quantum dots.We take the next steps toward hole spin qubits by preparing a double quantum dot in a one-layer gate structure,then using multilayer gate stacks to demonstrate improved quantum dot control. |
Wednesday, March 6, 2019 12:39PM - 12:51PM |
L11.00006: A solvable quantum model of dynamic nuclear polarization in quantum dots Thomas Nutz, Edwin Barnes, Sophia Economou Dynamic nuclear polarization (DNP) in quantum dots has given rise to a variety of unexpected and potentially useful effects, yet a consistent theoretical description with predictive power is still lacking. We present a quantum mechanical theory of optically induced DNP applicable to quantum dots and other interacting spin systems. The exact steady state of the optically driven coupled electron-nuclear system is calculated under the assumption of constant hyperfine coupling strengths (box model) for an arbitrary number of nuclear spins. Based on this analytical result we investigate the nuclear spin behaviour for different experimental parameter regimes and find that our model reproduces the flat-top and triangular absorption lineshapes (linedragging) seen in various experiments. Furthermore we predict a novel DNP effect. Under particular and achievable experimental conditions the nuclear spin system tends to polarize in such a way as to cancel the effect of the external magnetic field. The predicted sharply peaked nuclear spin polarization probability distributions centered at the value corresponding to degenerate electronic transitions would be of great significance for quantum technological applications. |
Wednesday, March 6, 2019 12:51PM - 1:03PM |
L11.00007: Plasmon mediated quantum communication between quantum dot clouds Ravindra Yadav, Matthew Otten, Weijia Wang, Stephen K Gray, D. J. Gosztola, Gary P Wiederrecht, Teri W. Odom, Jaydeep K Basu We report experimental and theoretical studies of the interaction of a quantum dot (QD) cloud [1] with a remote QD cloud mediated by surface lattice resonances (SLR) in two dimensional array of plasmonic nanoparticles[2]. By exciting one QD cloud and collecting the photoluminescence from a remote, unexcited QD cloud, we experimentally demonstrate long range, SLR mediated coupling between the two clouds. We explore the coupling between the two QD clouds through the SLR. Our results suggest an exciting new direction where coherent plasmonic systems can mediate interactions between remote QDs, having various applications in quantum information processing and quantum computation, such as realizing two qubit gate interactions between the QD clouds. |
Wednesday, March 6, 2019 1:03PM - 1:15PM |
L11.00008: Simulating topological insulators with donors and quantum dots Nguyen Le, Andrew James Fisher, Eran Ginossar We explore the possibilities of simulating the Su-Schrieffer–Heeger (SSH) model of topological insulators with a one dimensional chain of donors or quantum dots. A measurement of the transverse tunneling current through one end of the chain is proposed for confirming the existence of the edge state in the topologically non-trivial phase. For donors and quantum dots the electron-electron interaction is typically larger than the hopping amplitude, resulting in strong correlation in the ground state. We investigate the effect of interaction on the spin correlation, entanglement, excitation energy spectrum and the Zak phase. We discuss bulk-edge correspondence between the Zak phase and the edge state in the correlated case. An external magnetic field can be used to induce a transition to the well-understood limit of the non interacting SSH model. This transition is accompanied by a strong enhancement of the edge state's spatial localization, and hence can be identified by observing a sharp increase in the conductance signal. |
Wednesday, March 6, 2019 1:15PM - 1:27PM |
L11.00009: Kitaev chain with a quantum dot Chuanchang Zeng, Christopher Moore, Apparao Mohan Rao, Tudor Dan Stanescu, Sumanta Tewari We solve analytically the problem of a finite length Kitaev chain coupled to a quantum dot (QD), which extends the standard Kitaev chain problem making it more closely related to the quantum dot-semiconductor-superconductor (QD-SM-SC) nanowire heterostructure that is currently under intense investigation for possible occurrence of Majorana zero modes (MZMs). Our analytical solution reveals the emergence of a robust near-zero-energy Andreev bound state (ABSs) localized in the quantum dot region as the generic lowest energy solution in the topologically trivial phase. By contrast, in the bare Kitaev chain problem such a solution does not exist. The robustness of the ABS in the topologically trivial phase is due to a partial decoupling of the component Majorana bound states (MBSs) over the length of the dot potential. As a result, the signatures of the ABS in measurements that couple locally to the quantum dot, e.g., tunneling measurements, are identical to the signatures of topologically-protected MZMs, which arise only in the topological superconducting (TS) phase of the Kitaev chain. |
Wednesday, March 6, 2019 1:27PM - 1:39PM |
L11.00010: Simple and Re-useable Flip-Chip Method for Hybrid Quantum Sytems Christopher Conner, Kevin Satzinger, Youpeng Zhong, Hung-Shen Chang, Gregory A Peairs, Audrey Bienfait, Ming-Han Chou, Agnetta Cleland, Etienne Dumur, Joel Grebel, Rhys G Povey, Samuel Whiteley, David Awschalom, David Schuster, Andrew N Cleland The flexibility and scalability of solid-state qubit systems can be greatly improved with the use of flip-chip geometries, as these provide a third dimension for interconnects and allow coupling of systems on different substrates [1,2]. Indium bump-bonded flip-chips can be prohibitively costly for a university lab, and do not offer a means to re-use the substrates. Here, we describe a simple, low cost, non-galvanic approach to flip-chip bonding, demonstrated using superconducting qubits coupled to other quantum systems, including acoustic and electromagnetic resonators. We achieve less than two microns of placement error, and provide a cryogenically-compatible bonded structure that can be disassembled using acetone. We have tested the approach using inductively coupled coplanar waveguide resonators, and we have designed a multi-qubit experiment with direct inductive coupling between qubits on separate substrates. |
Wednesday, March 6, 2019 1:39PM - 1:51PM |
L11.00011: High Temperature Superconducting nano-meanders made by ion irradiation Paul Amari, C Feuillet-Palma, François Couëdo, Nicolas Bergeal, J Lesueur Low temperature Superconducting single photon detectors (SSPD) are suitable for quantum information and space communications applications. They show unrivaled performances from visible wavelength to 10μm that require complex cryogenics at 4K that limit applications. In this respect, high temperature superconductors (HTS) are attractive materials to design SSPDs operating at 40K. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700