Bulletin of the American Physical Society
APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014; Denver, Colorado
Session G32: Invited Session: Superconducting Qubits |
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Sponsoring Units: GQI DCMP Chair: Matthias Steffen, IBM Room: 708-712 |
Tuesday, March 4, 2014 11:15AM - 11:51AM |
G32.00001: Steps Toward Fault-Tolerant Quantum Computing with 2D and 3D Superconducting Qubits Invited Speaker: Douglas McClure Recent improvements in superconducting qubit coherence times, entangling gates, and measurement techniques have set the stage for high-fidelity demonstrations of multi-qubit operations needed for performing error correction in architectures such as the surface code. Using a planar network of transmon qubits and superconducting resonators, we benchmark a complete set of high-fidelity single- and two-qubit gates on a three-qubit sub-section of the surface code. Combining these gates with high-fidelity individual single-shot readouts, we deterministically entangle two non-nearest-neighbor qubits to implement a parity check operation, an essential component of surface code error correction. A complementary system consisting of three-dimensional cavities linked by individually placed transmon qubits provides an additional platform for the investigation of loss mechanisms and entangling schemes. Using this architecture, we demonstrate high-fidelity entanglement between arbitrary qubit pairs in a three-qubit, four-cavity network. [Preview Abstract] |
Tuesday, March 4, 2014 11:51AM - 12:27PM |
G32.00002: Deterministic Quantum Teleportation with Feed-Forward in a Solid State System Invited Speaker: Andreas Wallraff Using modern micro and nano-fabrication techniques combined with superconducting materials we realize electronic circuits the dynamics of which are governed by the laws of quantum mechanics. Making use of the strong interaction of photons with superconducting quantum two-level systems realized in these circuits we investigate both fundamental quantum effects of light and applications in quantum information processing. In this talk I will discuss the deterministic teleportation of a quantum state in a macroscopic quantum system with near unit success probability at a rate of 10 kHz [1]. Teleportation is useful for distributing entanglement between distant qubits in a quantum network and for realizing universal and fault-tolerant quantum computation. Previously, we have demonstrated the implementation of a teleportation protocol up to the single-shot measurement step [2]. Now we have realized a new device in which four qubits are coupled pair-wise to three resonators. Making use of parametric amplifiers [3] coupled to the output of two of the resonators we are able to perform high-fidelity single-shot read-out. Based on a close to ideal Bell-measurement identifying all four Bell-states in a single joint two-qubit measurement we have implemented fast feed-forward to complete the teleportation process. In this setup we have demonstrated teleportation by individually post-selecting on any Bell-state, by deterministically and simultaneously distinguishing between all four Bell states, and by implementing the feed-forward step to have the protocol succeed with near unit probability [1]. In all instances, we demonstrate that the fidelity of the teleported states and the fidelity of the teleportation process are above the thresholds imposed by classical physics. The presented experiments are expected to contribute to the realization of quantum communication over small and medium scale distances with microwave photons in the foreseeable future. \\[4pt] [1] L. Steffen et al., Nature 500, 319 (2013). \newline [2] M. Baur et al., Phys. Rev. Lett. 108, 040502 (2012). \newline [3] C. Eichler et al., Phys. Rev. Lett. 107, 113601 (2011). [Preview Abstract] |
Tuesday, March 4, 2014 12:27PM - 1:03PM |
G32.00003: Two-qubit parity meters in 3D and 2D circuit QED Invited Speaker: Leonardo DiCarlo Non-demolition measurements of multi-qubit observables and feedback control conditioned on their outcomes are essential for quantum error correction. We present two implementations of two-qubit parity meters in circuit QED. In 3D, we match the dispersive coupling of two qubits to a common cavity to encode parity in the transmission of an applied microwave pulse. In 2D, we first encode the parity of two data qubits in the computational state of an ancillary qubit using resonant interactions, and subsequently project the ancilla using a dedicated, dispersively-coupled resonator. A key advantage of this second scheme is the protection of data qubits from dephasing by measurement photons. First applications of these parity meters include probabilistic entanglement by measurement, and deterministic entanglement using digital feedback control. Current efforts target the implementation of measurement-based bit-flip error correction. [Preview Abstract] |
Tuesday, March 4, 2014 1:03PM - 1:39PM |
G32.00004: Applications of superconducting circuits to quantum computing Invited Speaker: Frank Wilhelm Superconducting circuits containing Josephson junctions are strong contenders for the implementation of a quantum computer. At its 15 year mark, the field has seen tremendous progress with an increase of coherence by six orders of magnitude and it is now taking off from the few- to the multi-qubit level. I will present highlights of research on the level of single devices, in particular the strong increase of coherence that counter-intuitively comes with a growth in device size, as well as readout. I will cover challenges related to multi-qubit systems focusing on precise multi-qubit control and calibration, and present an outlook on future architectures dictated by the requirements of fault tolerance. [Preview Abstract] |
Tuesday, March 4, 2014 1:39PM - 2:15PM |
G32.00005: Fault-tolerant quantum computing with superconducting qubits Invited Speaker: John Preskill I review and assess the theory of fault-tolerant quantum computing, emphasizing applications to superconducting circuits. Topic considered include topological codes, protection against biased noise, and error-resistant hardware. [Preview Abstract] |
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