Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session X28: Quantum NanomechanicsInvited
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Sponsoring Units: DCMP Chair: Mark Dykman, Michigan State Univ Room: 405-407 |
Friday, March 6, 2020 11:15AM - 11:51AM |
X28.00001: Acoustic Phonon Fock States and Phonon-mediated Quantum Entanglement Invited Speaker: Andrew Cleland Superconducting qubits are an excellent system for building quantum computing systems, due to their good individual qubit performance metrics, the availability of a high fidelity two-qubit entangling gate, and their easy lithographic scaling to large qubit numbers. In addition, these qubits provide unique opportunities as testbed systems for quantum communication as well as developing hybrid quantum systems. One compelling opportunity is provided by the ability to use superconducting qubits to control and measure acoustically-active structures, structures that can potentially serve to link these qubits to other two-level systems or to e.g. optical signals. I will describe our recent progress in coupling superconducting qubits to surface acoustic waves. In one experiment we have demonstrated the quantum control of a single microwave-frequency mechanical mode in a surface acoustic wave (SAW) resonator [1]. In a second experiment [2], we have launched and received itinerant phonons in a 2 mm long acoustic Fabry-Perot resonator, and generated a phonon-mediated entanglement between two qubits. |
Friday, March 6, 2020 11:51AM - 12:27PM |
X28.00002: Quantum acoustics: creation and control of multi-phonon Fock states Invited Speaker: Robert Schoelkopf Quantum states of mechanical motion can be important resources for quantum information, metrology, and studies of fundamental physics. There have recently been several new demonstrations that advance our ability to generate, control, and measure individual quanta of motion. In our approach, we combine a superconducting qubit with a piezoelectric transducer, which can couple to high quality factor bulk acoustic resonators [1]. In analogy with cavity QED, this system allows for strong coupling between the electrical excitations of the qubit and single Gigahertz phonons trapped in a single-crystal substrate, opening new capabilities for manipulation of mechanical degrees of freedom in the quantum domain. First, we show that a single excitation can be controllably swapped back and forth between the qubit and the acoustic resonator. Next, by employing a flip-chip geometry and a phononic “supercavity” made by curving one side of the substrate, we observe increased phonon lifetimes approaching 100 microseconds, comparable to state-of-the-art qubit coherence times. Using this system, we can then carry out a protocol to climb the phonon ladder, creating multi-photon Fock states or superpositions of Fock states, and measuring the Wigner function of the results using the qubit. I will talk about the prospects of using these mechanical degrees of freedom as multi-mode memories and as probes of the fundamental mechanisms of decoherence in quantum systems. |
Friday, March 6, 2020 12:27PM - 1:03PM |
X28.00003: Amir Safavi-Naeini Invited Talk
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Friday, March 6, 2020 1:03PM - 1:39PM |
X28.00004: Ania Claire Jayich Invited Talk
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Friday, March 6, 2020 1:39PM - 2:15PM |
X28.00005: Nanotube Electro-Mechanical Resonators Invited Speaker: Adrian Bachtold Mechanical resonators based on carbon nanotubes feature a series of truly exceptional properties. Carbon nanotubes are the lightest resonators fabricated thus far. The mechanical vibrations are enormously sensitive to the electrons flowing through the nanotube, and vice versa. Taking advantage of this coupling, we developed a novel detection method that allows us to measure the mechanical vibrations of nanotube resonators with an unprecedented sensitivity [1]. In this talk, I will discuss our efforts to cool the amplitude of the thermal vibrations to a few quanta [2]. Cooling is achieved using a simple yet powerful method, which consists in applying a constant (DC) current of electrons through the suspended nanotube in a dilution fridge. I will also present results where we strongly couple mechanical vibrations to the two electron states involved in single-electron tunnelling (SET). It effectively creates a highly nonlinear potential for mechanical vibrations despite the relatively low quanta population (about 80 quanta). This enables us to demonstrate the polaronic nature of charge transport through a nanoelectromechanical device. |
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