Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session A24: Superconducting and Quantum MetamaterialsInvited
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Sponsoring Units: DCMP Chair: Kevin Osborn, University of Maryland Room: New Orleans Theater C |
Monday, March 13, 2017 8:00AM - 8:36AM |
A24.00001: Emergent and Nonlinear Properties of Macroscopic Quantum Metamaterials Invited Speaker: Steven Anlage |
Monday, March 13, 2017 8:36AM - 9:12AM |
A24.00002: Nonlinear electromagnetic response of superconducting quantum metamaterials Invited Speaker: Shiro Kawabata Metamaterials are artificial electromagnetic materials consisting of artificial atoms, that is, artificial structures whose sizes are small compared to the wavelength of respective electromagnetic (EM) wave. The effective permittivity and permeability of metamaterials can be controlled at will by changing shapes and arrangements of the artificial atoms. The concept of metamaterial is quite useful for fabricating novel optical devices such as cloaking devices. Recently, quantum metamaterial (QMM), which utilizes superconducting qubits as artificial atoms, has been theoretically proposed and its prototypes have been realized experimentally [1,2]. Unlike conventional metamaterials composed of classical elements, QMMs are expected to show several unique EM responses originating from quantum superposition and entanglement of qubits. In this talk, we will present our recent theoretical studies on the nonlinear EM response of a QMM based on superconducting qubit arrays. Especially, we will discuss on a peculiar lasing phenomena [3] and the formation of a superconducting-vortex state [4] in such systems. [1] P. Macha, G. Oelsner, J. M. Reiner, M. Marthaler, S. Andre, G. Schon, U. Hubner, H. G. Meyer, E. Il'ichev, and A.V. Ustinov, Nature Comm. 5, 5146 (2014). [2] K. Kakuyanagi, Y. Matsuzaki, C. Deprez, H. Toida, K. Semba, H. Yamaguchi, W. J. Munro, and S. Saito, arXiv:1606.04222. [3] H. Asai, S. Savel'ev, S. Kawabata, A. Zagoskin, Phys. Rev. B 91 (2015)134513. [4] H. Asai, S. Kawabata, A. Zagoskin, S. Savel'ev, arXiv:1605.04929. [Preview Abstract] |
Monday, March 13, 2017 9:12AM - 9:48AM |
A24.00003: Coherent Response of Superconducting Qubit Arrays Invited Speaker: Alexey Ustinov A large array of qubits can be viewed as a quantum metamaterial, e.g., an artificially fabricated medium composed of two-level systems acting as artificial atoms. The electromagnetic wave propagation through such a medium is accompanied by excitation of intrinsic quantum transitions within individual meta-atoms and modes corresponding to the interactions between them. We have studied the microwave propagation through arrays of superconducting qubits. I will present experimental results on arrays of flux and transmon qubits coupled to resonators. The studied systems constitute different implementations of quantum metamaterials in the sense that many artificial atoms are coupled collectively to the quantized mode of a photon field. More recent experiments involve qubit arrays embedded into transmission lines. Here we employed two-cell superconducting flux qubits featuring tunneling between mirror-symmetric fluxoidal states. By varying an external magnetic field, we detected strong variations of the metamaterial transparency that are explained by magnetic flux localization and tunneling between metastable states in the two-cell flux qubits forming the quantum metamaterial. [Preview Abstract] |
Monday, March 13, 2017 9:48AM - 10:24AM |
A24.00004: Collective coupling in hybrid superconducting circuits Invited Speaker: Shiro Saito Hybrid quantum systems utilizing superconducting circuits have attracted significant recent attention, not only for quantum information processing tasks but also as a way to explore fundamentally new physics regimes. In this talk, I will discuss two superconducting circuit based hybrid quantum system approaches. The first is a superconducting flux qubit - electron spin ensemble hybrid system in which quantum information manipulated in the flux qubit can be transferred to, stored in and retrieved from the ensemble. Although the coherence time of the ensemble is short, about 20 ns, this is a significant first step to utilize the spin ensemble as quantum memory for superconducting flux qubits. The second approach is a superconducting resonator - flux qubit ensemble hybrid system in which we fabricated a superconducting LC resonator coupled to a large ensemble of flux qubits. Here we observed a dispersive frequency shift of approximately 250 MHz in the resonators transmission spectrum. This indicates thousands of flux qubits are coupling to the resonator collectively. Although we need to improve our qubits inhomogeneity, our system has many potential uses including the creation of new quantum metamaterials, novel applications in quantum metrology and so on. [Preview Abstract] |
Monday, March 13, 2017 10:24AM - 11:00AM |
A24.00005: Qubit lattice coherence induced by electromagnetic pulses in superconducting metamaterials Invited Speaker: George Tsironis |
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