Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session F51: Parametric and Multimode Interactions in Superconducting DevicesFocus
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Sponsoring Units: GQI Chair: Raymond Simmonds , National Institute of Standards and Technology Room: 398 |
Tuesday, March 14, 2017 11:15AM - 11:51AM |
F51.00001: Parametric interactions in multimode cavities Invited Speaker: Srivatsan Chakram Multimode cavities are a promising resource for quantum information and simulation, due to their large accessible Hilbert space, restricted set of decay and decoherence channels, large single-photon lifetimes, and ease of control using superconducting qubits. In this talk, we describe parametric control of a multimode circuit QED system with a superconducting transmon qubit. We show that single transmon charge control, and flux-driven sideband interactions with the cavity modes are sufficient for universal quantum control of the entire multimode manifold. We demonstrate universal gate operations between arbitrary modes, and efficient schemes for generating highly entangled multi-photon states. The realization of fast, tunable parametric interactions in a multimode cavity with tens of highly coherent quantum bits, shows promise for achieving quantum supremacy in the near term. [Preview Abstract] |
Tuesday, March 14, 2017 11:51AM - 12:03PM |
F51.00002: Quantum Flute: Multimode circuit QED with long-lived 3D cavities Ravi Naik, Srivatsan Chakram, Nelson Leung, David McKay, Taekwan Yoon, Peter Groszkowski, Jens Koch, David Schuster Superconducting microwave cavities have been shown to have very long single-photon lifetimes, making them a valuable resource for quantum computation and simulation. One of the major sources of dissipation in such cavities is loss occurring at the seam between two parts of the cavity, which has resulted in the exploration of seamless designs\footnote{M. Reagor, et al., Phys. Rev. B 94, 014506 (2016).}. Here, we present a novel technique for fabricating seamless multimodal cavities, with a variety of mode distributions. We discuss measurements of the quality factors of the cavity modes, as well as schemes for quantum control of the modes using superconducting transmon qubits. [Preview Abstract] |
Tuesday, March 14, 2017 12:03PM - 12:15PM |
F51.00003: Engineering interactions between long-lived cavities Yvonne Gao, Serge Rosenblum, Philip Reinhold, Chen Wang, Christopher Axline, Luigi Frunzio, Steven M. Girvin, Liang Jiang, Mazyar Mirrahimi, Michel H. Devoret, Robert J. Schoelkopf The availability of large Hilbert dimensions and outstanding coherence properties make superconducting cavities promising systems for storing quantum information. Recent experiments in cQED has demonstrated that redundantly encoding logical qubits in such cavities is a hardware-efficient approach toward error-correctable quantum memories. In order to tap into the power of these protected memories for quantum information processing, robust inter-cavity operations are required. A simple way to realise such operations between two cavities is using the non-linearity of the Josephson junction. To do so, we adopt a multi-cavity architecture where a fixed-frequency, single junction transmon simultaneously couples to two highly coherent 3D cavities. Using only external RF drives, we demonstrate transmon-cavity as well as cavity-cavity SWAP operations and show that such interactions are essential building blocks for implementing multi-cavity conditional logics. [Preview Abstract] |
Tuesday, March 14, 2017 12:15PM - 12:27PM |
F51.00004: Cavity-cavity conditional logic Serge Rosenblum, Yvonne Y. Gao, Philip Reinhold, Chen Wang, Christopher Axline, Luigi Frunzio, Steven M. Girvin, Liang Jiang, Mazyar Mirrahimi, Michel H. Devoret, Robert J. Schoelkopf In a superconducting circuit architecture, the highest coherence times are typically offered by 3D cavities. Moreover, these cavities offer a hardware-efficient way of redundantly encoding quantum information. While single-qubit control on a cavity has already been demonstrated, there is a need for a universal two-qubit gate between such cavities. In this talk, we demonstrate a cavity-cavity gate by parametric pumping on a fixed-frequency transmon interacting with the two cavities. Every gate application lowers the state fidelity by only $\sim$1\%, while maintaining an entangling rate on-off ratio of $\sim$29dB. Additionally, we show that the gate is applicable not only to qubits consisting of single photons, but also to more complex encodings. These results illustrate the usefulness of cavities beyond the mere storage of quantum information, and pave the way towards gates between error-corrected logical qubits. [Preview Abstract] |
Tuesday, March 14, 2017 12:27PM - 12:39PM |
F51.00005: Superconducting metamaterial resonators: analysis of mode structure Haozhi Wang, Matthew Hutchings, Sagar Indrajeet, Francisco Rouxinol, Matthew LaHaye, B.L.T. Plourde, Bruno G. Taketani, Frank K. Wilhelm, Alexander Zhuravel, Alexey Ustinov Metamaterial transmission line resonators fabricated from superconducting thin films exhibit novel mode spectra that can be used for multi-mode experiments with superconducting qubits. For certain configurations of the circuit elements, these structures have a dispersion relation that is a falling function of wavenumber, leading to a high density of narrow modes in the typical frequency range of transmon qubits. We present Laser Scanning Microscope images of the microwave current distribution while driving the various metamaterial resonances and we compare these with numerical simulations of the microwave behavior of these structures, including the effects of stray reactances in the circuit elements. We demonstrate that the wavelength of the metamaterial modes in fact grows with increasing frequency, characteristic of a left-handed system. [Preview Abstract] |
Tuesday, March 14, 2017 12:39PM - 12:51PM |
F51.00006: Multi-mode Experiments with Superconducting Qubits and Metamaterial Resonators. Sagar Indrajeet, Matthew Hutchings, Haozhi Wang, Britton Plourde, Bruno Taketani, Frank Wilhelm Metamaterial resonant structures made from arrays of lumped circuit elements can exhibit significantly different mode spectra compared to resonators made from conventional distributed transmission lines. In particular, left-handed resonators can be used to produce a high density of modes in the same frequency range where superconducting qubits are typically operated. We present a series of low-temperature measurements of such a superconducting metamaterial resonator coupled to a flux-tunable transmon qubit. Using a separate conventional resonator to read out the qubit state, we are able to track the qubit as we tune it through many of the metamaterial resonances. We present measurements of the qubit coherence as a function of frequency in this multi-mode system as well as measurements of Stark shifts of the qubit transition while driving a separate microwave tone in the vicinity of the various metamaterial modes. [Preview Abstract] |
Tuesday, March 14, 2017 12:51PM - 1:03PM |
F51.00007: Multimode Entanglement Generation in a Parametric Superconducting Cavity C. W. S. Chang, A. M. Vadiraj, P. Forn-Díaz, C. M. Wilson Parametric processes in microwave system are a source of nonclassical radiation with a number of potential applications in quantum information processing. Here we have implemented and experimentally verified a source of entangled microwave fields. Implementing a tunable, multimode microwave resonator with 3 modes in the common 4-12 GHz range, we performed two-mode parametric down-conversion between pairs of modes and observed the induced correlations in their voltage quadratures. With the system gain and noise calibrated using a shot noise tunnel junction, we have verified pairwise entanglement among the frequency modes. By introducing a second pump tone, its possible to simultaneously observe correlations between all 3 modes. We study the possibility of generating multimode entanglement in this way. [Preview Abstract] |
Tuesday, March 14, 2017 1:03PM - 1:15PM |
F51.00008: Non-resonant interactions between superconducting circuits coupled through a dc-SQUID X. Y. Jin, F. Lecocq, K. Cicak, S. S. Kotler, G. A. Peterson, J. D. Teufel, J. Aumentado, R. W. Simmonds We use a flux-biased direct current superconducting quantum interference device (dc-SQUID) to generate non-resonant tunable interactions between transmon qubits and resonators modes. By modulating the flux to the dc-SQUID, we can create an interaction with variable coupling rates from zero to greater than 100 MHz. We explore this system experimentally and describe its operation. Parametric coupling is important for constructing larger coupled systems, useful for both quantum information architectures and quantum simulators. [Preview Abstract] |
Tuesday, March 14, 2017 1:15PM - 1:27PM |
F51.00009: Preparing quasienergy states on demand: a parametric oscillator Yaxing Zhang, Mark Dykman We study a parametrically driven nonlinear oscillator where the driving frequency is close to twice the oscillator eigenfrequency. We show that, by judiciously choosing the frequency detuning, one can prepare any even quasienergy (Floquet) state of the oscillator by adiabatically increasing the driving strength where the oscillator is initially in the ground state. This is a consequence of a remarkable feature of the system: the quasienergies of the Floquet states do not cross each other with the varying field strength, but can cross with the varying frequency detuning. For sufficiently strong field, the lowest (or highest, depending on the sign of the Duffing nonlinearity parameter) quasienergy state is a symmetric or an antisymmetric superposition of two (generally squeezed) coherent states of the oscillator with the same amplitudes and opposite phases. We find the Wigner distribution of the prepared states. We also discuss the Landau-Zener transitions in the Floquet dynamics and show that one can prepare on demand a superposition of quasienergy states via controlled nonadiabaticity. Of special interest is the transient radiation emitted by the oscillator after it has been prepared in a given quasienergy state. We find the characteristic spectrum of this radiation. [Preview Abstract] |
Tuesday, March 14, 2017 1:27PM - 1:39PM |
F51.00010: Purcell protection with strong measurability in a longitudinally coupled three-qubit system Sumeru Hazra, Suman Kundu, Tanay Roy, Madhavi Chand, Meghan P. Patankar, R. Vijay The standard dispersive readout technique in circuit-QED introduces a channel of relaxation via the measurement cavity due to the Purcell effect. Detuning the qubit from the cavity to suppress Purcell decay reduces the dispersive shift while Purcell filters require additional microwave circuitry. We propose a novel multi-qubit circuit, the ``trimon'', where three coupled anharmonic oscillator modes behave as three longitudinally coupled qubits in the 3D circuit-QED architecture. One dipolar mode is coupled to the cavity directly whereas the other orthogonal dipolar mode and the quadrupolar mode are ideally uncoupled from the resonator and hence Purcell protected. The directly coupled qubit leads to the standard dispersive shift on the cavity while the uncoupled qubits show dispersive shifts via the inter-qubit longitudinal coupling. We will demonstrate the Purcell protection of the uncoupled qubits when the coupled qubit is tuned very close to the resonator frequency for strong dispersive shift. Finally, we will discuss the potential of this device as an ``ideal qubit'' to replace the standard transmon qubits in many applications. Reference: arXiv:1610.07915. [Preview Abstract] |
Tuesday, March 14, 2017 1:39PM - 1:51PM |
F51.00011: Multi-mode superconducting circuit implementing all-to-all longitudinal coupling in a five qubit system Madhavi Chand, Suman Kundu, Tanay Roy, Sumeru Hazra, Meghan P. Patankar, R. Vijay Recently, we introduced a new multi-mode quantum device called the ``trimon'' to implement three transmon-like qubits with pairwise longitudinal coupling. Here, we extend that idea to a superconducting circuit with five normal modes and show the experimental characterization of the resulting five qubits. We will present data confirming their transmon-like properties and viable coherence times. We will also characterize the coupling of these modes to one another and to their environment. We will discuss the possibility of constructing circuits with larger number of normal modes and a general formalism to theoretically analyse such systems. We will conclude by discussing potential applications in quantum information processing. Reference: arXiv: 1610:07915. [Preview Abstract] |
Tuesday, March 14, 2017 1:51PM - 2:03PM |
F51.00012: Quantum correlations in microwave frequency combs Thomas Weissl, Shan W. Jolin, David B. Haviland Non-linear superconducting resonators are used as parametric amplifiers in circuit quantum electrodynamics experiments [1]. When a strong pump is applied to a non-linear microwave oscillator, it correlates vacuum fluctuations at signal and idler frequencies symmetrically located around the pump, resulting in two-mode squeezed vacuum. When the non-linear oscillator is pumped with a frequency comb, complex multipartite entangled states can be created as demonstrated with experiments in the optical domain [2, 3]. Such cluster states are considered to be a universal resource for one-way quantum computing. With our microwave measurement setup it is possible to pump and measure response at as many as 42 frequencies in parallel, with independent control over all pump amplitudes and phases. We show results of two-mode squeezing for of pairs of tones in a microwave frequency comb. The squeezing is created by four-wave mixing of a pump tone applied to a non-linear coplanar-waveguide resonator. [1] E. Thol\'{e}n et al., Appl. Phys. Lett.~90, 253509~(2007) [2] M. Chen et al., PRL \textbf{112}, 120505 (2014) [3] J. Roslund et al., Nat. Phot. 2013.340 (2013) [Preview Abstract] |
Tuesday, March 14, 2017 2:03PM - 2:15PM |
F51.00013: Engineering matter interactions using squeezed vacuum Sina Zeytinoglu, Atac Imamoglu, Sebastian Huber Virtually all interactions that are relevant for atomic and condensed matter physics are mediated by the quantum fluctuations of the electromagnetic field vacuum. Consequently, controlling the latter can be used to engineer the strength and the range of inter-particle interactions. Recent experiments have used this premise to demonstrate novel quantum phases or entangling gates by embedding electric dipoles in photonic cavities or waveguides which modify the electromagnetic fluctuations. In this talk, we demonstrate theoretically that the enhanced fluctuations in the anti-squeezed quadrature of a squeezed vacuum state allows for engineering interactions between electric dipoles without the need for a photonic cavity or waveguide. Thus, the strength and range of the resulting dipole-dipole coupling can be engineered by dynamically changing the spatial profile of the squeezed vacuum in a travelling-wave geometry. [Preview Abstract] |
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