Bulletin of the American Physical Society
46th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 60, Number 7
Monday–Friday, June 8–12, 2015; Columbus, Ohio
Session B7: Quantum Computation and Simulation |
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Chair: Mark Saffman, University of Wisconsin Room: Delaware CD |
Tuesday, June 9, 2015 10:30AM - 10:42AM |
B7.00001: Scrolling the quantum optical frequency comb: one-way quantum computing with hybrid time-frequency entanglement Olivier Pfister, Pei Wang, Rafael Alexander, Moran Chen, Niranjan Sridhar, Nicolas Menicucci On the heels of the experimental demonstrations of record-scale one-dimensional cluster-state entanglement --- suitable for implementing single-qumode quantum computing gates --- in the time domain [S. Yokoyama et al., Nat. Photon. 7, 982 (2013)] and the frequency domain [M. Chen et al., Phys. Rev. Lett. 112, 120505 (2014)], we show here that both degrees of freedom can be combined to generate a two-dimensional square-grid cluster-state --- suitable for universal quantum computing --- from a single optical parametric oscillator. This method, the most compact yet, has the potential to reach $10^{9}$ entangled qumodes, based on the current state of the art. [Preview Abstract] |
Tuesday, June 9, 2015 10:42AM - 10:54AM |
B7.00002: Realization of Quantum Integer-Spin Chains with Controllable Interactions Paul Hess, Philip Richerme, Crystal Senko, Jacob Smith, Aaron Lee, Itsik Cohen, Alex Retzker, Chris Monroe The physics of interacting integer-spin chains has been a topic of intense theoretical interest, particularly in the context of symmetry-protected topological phases. However, there has not been a controllable model system to study this physics experimentally. We demonstrate how spin-dependent laser forces on trapped $^{171}$Yb$^+$ ions can be used to engineer an effective system of interacting spin-1 particles. Our system evolves coherently under an applied spin-1 XY Hamiltonian with tunable, long-range couplings, and all three quantum levels at each site participate in the dynamics. This experimental platform enables future studies of symmetry-protected order in spin-1 systems and their use in quantum applications. [Preview Abstract] |
Tuesday, June 9, 2015 10:54AM - 11:06AM |
B7.00003: Quantum Thermalization and Localization in Trapped Ions Jacob Smith, Paul Hess, Harvey Kaplan, Aaron Lee, Brian Neyenhuis, Lexi Parsagian, Phil Richerme, Christopher Monroe Trapped-ion quantum simulators have proven useful in exploring quantum-many-body physics that is difficult to examine in condensed-matter experiments or using classical simulation. Here, we present experiments that investigate thermalization in closed quantum systems. Fully-connected Ising and XY models with tunable disorder are encoded within a chain of $^{171}$Yb$^+$ ions. We prepare arbitrary non-equilibrium initial states and determine if these states thermalize after a long time evolution. One could expect to observe prethermal or many-body localized behavior in our system depending upon the initial conditions and the amount of disorder present. [Preview Abstract] |
Tuesday, June 9, 2015 11:06AM - 11:18AM |
B7.00004: Quantum Simulation of Electronic Structure by Quantum Coupled-Cluster with a Trapped Ion System Shen Yangchao, Xiang Zhang, Shuaining Zhang, Jin-Ning Zhang, Man-Hong Yung, Kihwan Kim We report an experimental simulation of the electronic structure of a molecular ion based on a quantum version of the coupled-cluster method. The quantum method combines essential features from both classical and quantum computation in a way that can go beyond the limitations of the classical implementation of the unitary coupled-cluster method. The implementation was performed using a trapped multi-level ion (171Yb$+)$ controlled by microwave. The energies of the ground and excited states of a Helium hydride (HeH$^{+})$ were obtained as a function of the nuclear separation. The effects of a simulated electric field on the chemical bond beyond the perturbation regime were studied. Our results represent a step towards a new and practical approach for studying various molecular process through quantum simulation. This work was supported by the National Basic Research Program of China under Grants No. 2011CBA00300 (No. 2011CBA00301), the National Natural Science Foundation of China 11374178 and 041303016. [Preview Abstract] |
Tuesday, June 9, 2015 11:18AM - 11:30AM |
B7.00005: A 2D Array of 100's of Ions for Quantum Simulation and Many-Body Physics in a Penning Trap Justin Bohnet, Brian Sawyer, Joseph Britton, John Bollinger Quantum simulations promise to reveal new materials and phenomena for experimental study, but few systems have demonstrated the capability to control ensembles in which quantum effects cannot be directly computed. One possible platform for intractable quantum simulations may be a system of 100's of $^9$Be$^+$ ions in a Penning trap, where the valence electron spins are coupled with an effective Ising interaction in a 2D geometry. Here we report on results from a new Penning trap designed for 2D quantum simulations. We characterize the ion crystal stability and describe progress towards bench-marking quantum effects of the spin-spin coupling using a spin-squeezing witness. We also report on the successful photodissociation of BeH$^+$ contaminant molecular ions that impede the use of such crystals for quantum simulation. This work lays the foundation for future experiments such as the observation of spin dynamics under the quantum Ising Hamiltonian with a transverse field. [Preview Abstract] |
Tuesday, June 9, 2015 11:30AM - 11:42AM |
B7.00006: Entangling gates in trapped ions using arbitrary individual addressing and pulse shaping Caroline Figgatt, Shantanu Debnath, Norbert Linke, Lenore Koenig, Christopher Monroe We present progress towards quantum gates between arbitrary pairs of $^{171}$Yb$^{+}$ ions in a linear chain using individual optical addressing. A pulsed laser drives Raman transitions [1], using the beat note between frequency comb lines of counter-propagating Raman beams to couple the ion spins to the collective transverse modes of motion of the ion chain. Individual optical addressing of each ion with one Raman beam allows gates between arbitrary pairs of ions. A pulse shaping scheme is usedthat modulates the phase and amplitude of the Raman laser to drive high-fidelity entangling gates that are insensitive to detuning errors [2]. We can apply these gates programmatically to perform algorithms using concatenated operations. \\[4pt] [1] D. Hayes et. al., Phys. Rev. Lett. 104, 140501 (2010)\\[0pt] [2] T. Choi et al., Phys. Rev. Lett. 112, 19502 (2014) [Preview Abstract] |
Tuesday, June 9, 2015 11:42AM - 11:54AM |
B7.00007: Progress Towards Quantum Simulation Using Micro-fabricated Ion Traps K. Wright, G. Ji, C. Rickerd, K. Collins, C. Monroe We report on current experimental progress towards using a surface electrode trap for quantum simulation. We use a micro-fabricated trap developed collaboratively between the Georgia Tech Research Institute (GTRI) and Honeywell International known as the Ball Grid Array (BGA) trap. This trap features 96 electrodes for fine control of the DC potential as well as a small footprint allowing for tight focusing of interaction lasers. We discuss the experimental system which utilizes the BGA trap, loading of Yb171 ions in this trap, and deterministic loading of chains of five or more ions. We hope to take advantage of the features of this new trap architecture in order to perform a small scale Boson Sampling experiment. [Preview Abstract] |
Tuesday, June 9, 2015 11:54AM - 12:06PM |
B7.00008: Phonon down-conversion in a linear ion trap Shiqian Ding, Gleb Maslennikov, Roland Hablutzel, Huanqian Loh, Dzmitry Matsukevich Ions confined in a Paul trap are well isolated from the environment and their motion in the trap is usually well approximated by a set of normal modes. However, Coulomb interaction between trapped ions is nonlinear and can introduce coupling between the normal modes of motion. We report our experimental work on coherent coupling between axial and radial modes of motion in the ion crystal formed by two Yb+ ions. We show that under the resonant conditions one phonon in the axial motional mode of the ion crystal can be down-converted into two phonons in the radial mode of motion. [Preview Abstract] |
Tuesday, June 9, 2015 12:06PM - 12:18PM |
B7.00009: Deterministic Generation of High NOON States in Phonon Modes of a Trapped-Ion System Junhua Zhang, Mark Um, Luming Duan, Kihwan Kim We deterministically generate high NOON states (up to N=8) in two motional modes of a single 171Yb+ ion trapped in a three-dimensional harmonic potential. We develop a composite-pulse sequence that creates an arbitrary multi-mode phonon state. We implement anti-Jaynes-Cummings interaction between internal levels and multiple motional modes in a trapped ion system by stimulated Raman laser beams. We apply the scheme to generate a highly entangled NOON state and verify it by observing the characteristic $N$ parity oscillations within a phase range of 2 $\pi$. The NOON states can be applied to quantum information processing, quantum metrology including phase sensitive measurements of mechanical oscillations. Moreover, our generation scheme is not limited to the NOON state and can be used to prepare other useful entangled phonon states. [Preview Abstract] |
Tuesday, June 9, 2015 12:18PM - 12:30PM |
B7.00010: Quantum simulation of Dirac tachyons with trapped ions via quantum measurement Tony Lee, Unai Alvarez-Rodriguez, Xiao-Hang Cheng, Lucas Lamata, Rajibul Islam, Enrique Solano It has been predicted that particles with imaginary mass, called tachyons, would be able to travel faster than the speed of light. So far, there has not been any experimental evidence for tachyons in either natural or engineered systems. Here, we describe how to experimentally realize Dirac tachyons with trapped ions: quantum measurement on a Dirac particle causes it to have an imaginary mass so that it travels faster than the effective speed of light in the system. We show that a Dirac tachyon must have spinor-motion entanglement in order to be superluminal. We also show that it exhibits significantly more Klein tunneling than a normal Dirac particle. We provide example experimental numbers and show that our scheme is feasible using current technology. [Preview Abstract] |
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