Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session M17: Hybrid Systems - Spins, Quantum Dots, MicrowavesFocus
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Sponsoring Units: DQI Chair: Karl Petersson, Niels Bohr Inst Room: 203 |
Wednesday, March 4, 2020 11:15AM - 11:51AM |
M17.00001: Long-distance entangling gates between quantum dot spins mediated by a superconducting resonator Invited Speaker: Sophia Economou A recent experimental breakthrough in gate-defined quantum dots (QDs) is the strong coupling between the spin and a superconducting resonator mode, mediated through the orbital degree of freedom. This, along with advances in the control of QD spins, indicate a path toward scalable quantum information processing devices. I will present our work on high-fidelity quantum gates, both between spin qubits in neighboring QDs and between remote QDs coupled through a resonator mode. I will also discuss possible paths to multi-qubit gates and quantum algorithms. |
Wednesday, March 4, 2020 11:51AM - 12:03PM |
M17.00002: Resonant Microwave Mediated Interactions Between Distant Electron Spins Felix Borjans, Xanthe Croot, Xiao Mi, Michael Gullans, Jason Petta The ability to transfer quantum states and generate entanglement over distances much larger than qubit length scales is an important step towards maximal parallelism and the implementation of two-qubit gates on arbitrary pairs of qubits. Extending qubit interactions beyond the nearest neighbor is particularly beneficial for spin-based quantum computing architectures, which are limited by short-range exchange interactions. Experimental progress towards achieving long-range spin-spin coupling has so far been restricted to interactions between individual spins and microwave photons [1,2,3]. We demonstrate resonant microwave-mediated coupling between two electron spins that are physically separated by more than 4 mm [4]. Our results imply that microwave-frequency photons may be used as a resource to generate long-range two-qubit gates between spatially separated spins. |
Wednesday, March 4, 2020 12:03PM - 12:15PM |
M17.00003: Interfacing epitaxial rare earth spins with superconducting circuits for high-sensitivity ESR Noah Johnson, Shobhit Gupta, Yuxiang Pei, Manish Kumar Singh, Supratik Guha, David I Schuster, Tian Zhong, Jun Yang, Haitao Zhang Hybrid quantum systems interfacing superconducting circuits with solid-state spin ensembles provide a practical route to realizing long-term microwave quantum memories and high-sensitivity inductive electron spin resonance (ESR) detection [1,2]. Specifically, ensembles of erbium ions are a promising platform for quantum networks and transduction [3] due to their long coherence times and telecom band optical transition at 1.54 μm. We report on pulsed and continuous wave ESR spectroscopy measurements of erbium dopants in Y2O3 [4] performed at millikelvin temperature using a microwave resonator. Using a superconducting low impedance resonator on epitaxially grown thin-film Y2O3 will allow for further increased coupling rates between the cavity photons and electron spins on the order of kHz. |
Wednesday, March 4, 2020 12:15PM - 12:27PM |
M17.00004: High-Speed Quantum Interface with a Quantum Dot Molecule Coupled to a Superconducting Resonator Yuta Tsuchimoto, Zhe Sun, Emre Togan, Patrick Knüppel, Aymeric Delteil, Stefan Fält, Martin Kroner, Klaus Ensslin, Andreas Wallraff, werner wegscheider, Atac Imamoglu Quantum transduction between optical and microwave photons is a key element of quantum networks. An optically-active quantum dot molecule (QDM) has a large electric dipole moment which can couple to microwave (MW) photons in a superconducting (SC) resonator [1]. In our scheme, the following features with a large MW coupling strength realize fast and efficient transduction: (i) a low-Q asymmetric optical cavity encapsulating the QDM ensures high-efficient absorption of incoming optical photons; (ii) fast radiative decay of the QDM finishes the transduction in nanosecond time scales; (iii) the radiative decay channel emits heralding photons upon success of the transduction. |
Wednesday, March 4, 2020 12:27PM - 12:39PM |
M17.00005: On-chip superconducting resonator devices for sensitive spin detection at high magnetic fields. Giovanni Franco-Rivera, Josiah Cochran, Lei Chen, Zhen Wang, Sylvain Bertaina, Irinel Chiorescu The ability to probe spin-photon interactions using Electron Spin Resonance techniques has gained significant interest given the realization of hybridized states between microwave photons and different spin ensembles.1-3 On-chip superconducting resonators provides a way to inductively couple a spin two level system with a resonant electromagnetic mode leading to enhanced sensitivity4 when compared to traditional 3D resonators. We demonstrate the implementation of λ/4 resonator placed after a coplanar waveguide-to-stripline transition on a 20 nm thick Nb film. Temperature effects on the losses and resonance frequency are studied for bare and spin loaded resonators. A resonance signal at 0.62 T for a spin S=1/2 system is presented, demonstrating the feasibility of such on-chip structures for high magnetic field electron spin detection. |
Wednesday, March 4, 2020 12:39PM - 12:51PM |
M17.00006: Theory of spin-orbit mediated hole spin-photon coupling in lateral Ge/SiGe quantum dots Vanita Srinivasa, Rupert M Lewis, Lisa A Tracy, Tzu-Ming Lu, Will J. Hardy, Mitchell Brickson, Andrew D. Baczewski, Dwight R Luhman Coupling semiconductor spin qubits to microwave photons enables long-range quantum information transfer, and strong spin-photon 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 spin-orbit interaction. We present an analytical formulation of heavy hole spin-photon coupling mediated by spin-orbit interaction in lateral Ge/SiGe quantum dots. Using this formalism, we derive expressions for effective single-photon and three-photon coupling within this system and explore the strengths of these interactions in experimentally relevant parameter regimes. |
Wednesday, March 4, 2020 12:51PM - 1:03PM |
M17.00007: High kinetic inductance superconducting cavity for strong coupling of Si/SiGe qubits Mario Palma, Nathan Holman, Samuel Neyens, Evan R MacQuarrie, Lisa F Edge, Mark G Friesen, Susan Nan Coppersmith, Robert F McDermott, Mark Alan Eriksson Achieving long range coherent interactions between qubits is a milestone of quantum information. In recent years the field of circuit quantum electrodynamics (cQED) has demonstrated long range coupling between superconducting qubits, quantum dots in various semiconductors systems, and even coupling between hybrid systems. Strong coupling between remote qubits requires that the coupling strength be larger than the decoherence rates of both the microwave cavity and the qubits. The coupling can be enhanced by increasing the impedance of the cavity. There are two possible ways to achieve such a goal: first, by using a superconductor with high kinetic inductance; second, by using an array of Josephson junctions, which constrains the application of an external magnetic field. We present a Si/SiGe quantum dot device that combines a high impedance cavity and low impedance leads to reduce the photon leakage through the DC lines. The resonator is made of NbN, a high kinetic inductance superconductor, while the leads are composed of a thin layer of NbN with a thicker layer of Nb on top to reduce the impedance of the leads. The third harmonic can be used to further enhance the coupling strength between the dots and the resonator, which is important for strong coupling. |
Wednesday, March 4, 2020 1:03PM - 1:15PM |
M17.00008: Coupling silicon qubits via a high-impedance superconducting resonator Patrick Harvey-Collard, guoji zheng, Jurgen Dijkema, Nodar Samkharadze, Delphine Brousse, F. Carrasco, Amir Sammak, Giordano Scappucci, Lieven M Vandersypen Spin qubits in semiconductors like silicon are widely perceived as an ideal technology platform to realize a quantum computer. Their advantages range from the high integration density and the mature manufacturing technology of classical computers, to their long lifetimes and low error rates. On the other hand, spins in semiconductors are not easy to couple over long distances. For this, optical or microwave photons are much better suited. Here, I will describe our experimental efforts to couple two spin qubits through a superconducting microwave resonator. To enlarge the coupling to the qubit charge dipole, we use a high-kinetic-inductance NbTiN nanowire resonator and achieve a large impedance of about 3 kΩ. The high impedance and kinetic inductance come with microwave engineering challenges (e.g. leakage through the gate fanout) and we discuss several approaches to overcome these. Finally, we demonstrate operation of a device with two silicon double quantum dots coupled to the same resonator. Our work opens up opportunities to adapt very powerful and well-developed techniques from circuit quantum electrodynamics and superconducting qubits to the spin qubit world. These opportunities include long-range coupling of spin qubits, and fast spin readout without charge sensors. |
Wednesday, March 4, 2020 1:15PM - 1:27PM |
M17.00009: Sensitive spin detection using differential squids and on chip microwave waveguide Josiah Cochran, Giovanni Franco-Rivera, Lei Chen, Zhen Wang, Irinel Chiorescu Sensitive detection of spin resonance is essential for achieving coherent spin qubit control1. Recent experiments have involved bifurcation resonators2, and artificial atoms3, which provide sensitivity over a wide frequency range; however, a broadband device is needed for complex materials2. A novel differential squid detection method for spin systems on a microwave waveguide is being developed at NHMFL. This method utilizes a superconducting niobium coplanar strip line broadband microwave device coupled with niobium nano-squid devices. A nano-fabricated planar Dayem bridge squid is placed inside an omega loop for sensitive spin detection while a secondary squid is placed far away from the omega loop in order to measure background fields. The differential measurement of the fields measured by the two squids will result in a cancellation of background fields with the goal of having a more sensitive spin detection. |
Wednesday, March 4, 2020 1:27PM - 1:39PM |
M17.00010: From Transistors to Circuit Realization of a 50mK Analog Amplifier in FDSOI Technology For Measuring Quantum-Dots Loïck Le Guevel, Gérard Billiot, Marco L.V. Tagliaferri, Marcos Zurita, Silvano De Franceschi, Marc Sanquer, Maud Vinet, Xavier Jehl, Aloysius G.M. Jansen, Gaël Pillonnet On-chip cryogenic electronics will accelerate the development of silicon-based quantum bits for quantum computing allowing for faster systematic device tests with various materials and geometries. Low-frequency analog characteristics of single FDSOI 28nm MOSFETs and available passive elements were investigated at cryogenic temperature and compared to actual model predictions. The impact on circuit-specifications was studied for a transimpedance amplifier (TIA) operating down to 50mK such as the low- temperature increase of the transistor transconductance leading to a times-5 improvement of the bandwidth. This cryogenic TIA was cointegrated with a quantum dot and compared to a commonly used room-temperature measurement method. Finally, we foresee that the bandwidth of 2.6 kHz can be increased by almost two orders of magnitude while maintaining a 1 μW power consumption, compatible with available cooling power at 100 mK. |
Wednesday, March 4, 2020 1:39PM - 1:51PM |
M17.00011: 3D integrated device architecture for hybrid superconductor-semiconductor quantum dot devices Felix Julian Schupp, Xanthe Croot, Felix Borjans, Xiao Mi, Danna Rosenberg, Rabindra Das, David K Kim, Alexander Melville, William Oliver, Jason Petta Low internal losses in superconducting resonators require optimized fabrication that was developed in the framework of superconducting qubits. Semiconductor spin-qubit experiments in hybrid super-semi cQED involve semiconducting substrates, gate-oxides, dopants or even micromagnets, which may not be compatible with conventional resonator fabrication leading to higher internal losses. Here we present a 3D integrated super-semi architecture with the superconducting resonator chip fabricated in an environment optimized for superconducting qubits and then flip-chip bonded onto a spin-qubit chip fabricated in its own dedicated facility. Compared to previous cQED experiments with semiconductor spins, we demonstrate reduced photon losses in the few-photon regime and with Al gate-electrodes connected to the resonator. Using a perforated ground plane, we achieve Q=74k at an in-plane magnetic field of 100 mT, which is required for spin-photon coupling. |
Wednesday, March 4, 2020 1:51PM - 2:03PM |
M17.00012: Quantum physics with pulses of radiation Klaus Molmer
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Wednesday, March 4, 2020 2:03PM - 2:15PM |
M17.00013: Quantum optical characterization of rare earth ion in superconductor quantum memory Osama Nayfeh There is a need for the implementation of quantum entangled memory devices that can interface to computational qubit devices via efficient transfer of the low coherence time qubit states to the high coherence spin states of optically active ions. We present characterization in the cryogenic regime of a rare earth ion quantum memory we formed from ion implantation of Neodymium ions in superconducting Niobium Nd3+:Nb. We examine via spectroscopy in a cryo-magneto-optical probe station, the 4F3/2 to 4I 9/2 transition in the NIR at 903.4 nm as a function of magnetic and microwave field. We quantify the spin echoes to evaluate T1 and T2 coherence times. We find an improvement when entering the superconducting regime of Niobium at 7.5 K. We study the effects of varying the laser excitation intensity and the microwave and magnetic field strengths on key parameters. The results are consistent with an increase of the spin relaxation and are discussed in accordance with theoretical models. |
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