Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session U09: Gates and Operations with Trapped Atoms and IonsLive
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Chair: Guido Pagano, Rice |
Thursday, June 3, 2021 2:00PM - 2:12PM Live |
U09.00001: A programmable Fermi-Hubbard tweezer array Benjamin M Spar, Elmer Guardado-Sanchez, Zoe Yan, Waseem S Bakr Over the past few years, fermionic quantum gas microscopes have been used to explore equilibrium and dynamical properties of the Fermi-Hubbard model. However, these studies have been limited by high entropies per particle, which has prevented exploration of both certain low temperature phases of interest and dynamics with controlled initial states. Here we present a new platform to reach record low entropies with a one-dimensional lattice system formed by optical tweezers. Building on the work of [1], we load a degenerate Fermi gas of atoms into an array of four tweezers, creating a band insulator with entropies $<= 0.1 k_b$ per particle, around four times lower than the previous record [2]. We adiabatically introduce four additional empty tweezers and allow for tunneling to create a low entropy correlated state at half filling. We obtain single-site readout by loading the tweezers into an optical lattice quantum gas microscope and subsequently imaging. By generating tweezers with multiple acousto-optical modulators or a spatial light modulator, we plan to expand to a two-dimensional array with hundreds of atoms. In addition to studying lower temperature Fermi-Hubbard physics, with this platform we will be able to study Hamiltonians with flexible geometries and single-site control. |
Thursday, June 3, 2021 2:12PM - 2:24PM Live |
U09.00002: Parallel hybrid quantum circuits in trapped ions with phonon-error mitigation Umang Mishra, Qiming Wu, Yue Shi, Jiehang Zhang Essential to quantum information processing (QIP) are entangling gates, where errors arising from imperfect qubit manipulations cause undesirable decoherence. Error mitigation techniques are hence important for scaling to larger qubit system sizes in the near term. Trapped ion systems are a leading platform for QIP on both the digital and analog fronts, however, quantum simulators in the dispersive coupling regime suffer from phonon errors due to residual spin-phonon entanglements. We develop a scheme to mitigate such errors by utilizing the axial normal-mode structure, while simultaneously offering fast entangling gates with all-to-all connectivity. Such parallel gates are ideal for hybrid analog-digital quantum circuits, with potential applications for studying non-equilibrium quantum many-body physics and quantum chaos. Our regime goes beyond the long-range power-law interactions demonstrated thus far, and can be combined with individual qubit gates to achieve universal quantum computing. |
Thursday, June 3, 2021 2:24PM - 2:36PM Live |
U09.00003: Remote entanglement of 138Ba+ ions in separate traps using visible photons Yao De George Toh, Allison L Carter, Jameson O'Reilly, Sagnik Saha, Andrew Risinger, Christopher R Monroe Trapped atomic ions are one of the leading platforms for quantum computing systems and quantum networks. We report progress on one building block of a trapped-ion quantum network, the remote entanglement of ions in two separate vacuum chambers. Single photons at 493 nm are collected from a 138Ba+ ion in each trap using high numerical aperture (NA=0.6) optics, and Hong-Ou-Mandel interference erases which-path information. Then, a Bell state measurement of the photons heralds entanglement of the two remote qubits. We verify this entanglement by measuring the correlations of the ion states in multiple bases. We present preliminary results for entanglement generation rate and fidelity and also speculate on how this system will scale to larger and more modules. |
Thursday, June 3, 2021 2:36PM - 2:48PM Live |
U09.00004: Reduced mid-circuit measurement error with trapped ions using micromotion John P Gaebler, Juan Pino, Steven A Moses, Joan Dreiling, Caroline Figgatt, Charles H Baldwin, Daniel N Gresh The ability to perform measurements on subsets of qubits without inducing decoherence on the rest of the system is a key capability for many quantum information protocols including error correction, quantum teleportation and measurement-based quantum computing. In many systems, achieving sufficient isolation of neighboring qubits while performing strong measurements on selected qubits is a significant technical challenge. For trapped-ion systems, where laser-induced fluorescence is the standard measurement technique, both stray light from the detection beam as well as the fluorescence from the measured ions can be significant sources of unwanted decoherence of the unmeasured qubits. Here we present a technique using the micromotion of the ions to reduce these sources of decoherence by over an order of magnitude. We implement the technique in Honeywell trapped ions systems where it plays a key role in achieving the low measurement crosstalk error needed for many recent demonstrations. |
Thursday, June 3, 2021 2:48PM - 3:00PM Live |
U09.00005: ABaQuS: A trapped-ion quantum computing system using 133Ba+ qubits Ana Sotirova, Fabian Pokorny, Lee Peleg, Chris Ballance We present the design of a trapped-ion quantum computing system based on 133Ba+ ions. The 133Ba+ ions offer a range of potential qubit states, including magnetically insensitive hyperfine ‘clock’ qubits in the ground level and in the metastable D5/2 level, and optical ‘clock’ qubits spanning the S1/2−D5/2 manifolds, therefore offering an interesting playground for novel qubit addressing, qubit hiding, and laser cooling schemes. The ion's visible light optical transitions [1] allow for the use of off-the-shelf laser components such as high performance fibre-based optical modulators. |
Thursday, June 3, 2021 3:00PM - 3:12PM Live |
U09.00006: Optimizing Voltage Waveforms for Ion-Shuttling Operations Luke Qi Trapped ions are a promising candidate for quantum information processing and quantum sensing. As experiments with ions increase in size and complexity, a trap array-based architecture for an ion trap with many independent zones is a promising approach. A crucial element in the operation of a trap array is the ability to split, move and recombine chains of ions on diabatic timescales and without incurring excessive decoherence of information stored in ion qubits. Here, we present an end-to-end numerical simulation pipeline of the ion shuttling process to optimize voltage waveforms that are pre-compensated for voltage-generation electronics, vacuum-system wiring, and electrode filtering. We simulate robust protocols generated with Shortcuts-to-Adiabaticity principles and compare the results with experimental results achieved using precision-timing, high-speed hardware. We run diabatic splitting experiments on an ion trap tailored to providing a large quartic confinement. The software and protocols presented here may provide a new standard method for optimizing voltage waveforms in future ion-shuttling experiments. |
Thursday, June 3, 2021 3:12PM - 3:24PM Live |
U09.00007: Optical Rotation of Few-Ion Crystals in a Linear Paul Trap Arpita Pal, Duc H Le, A. Ozawa, T. Udem, M. Bhattacharya The linear Paul trap provides a widely-used architecture in the field of quantum computing and quantum information processing. However, the rotational motion of ions has not accrued much attention until a recent study by E. Urban et al. [1], where trap voltages were engineered to coherently control a two-ion crystal. Ionic rotors are expected to be a promising candidate for precision measurements, stimulating Hawking radiation, and studying Aharonov-Bohm type physics. Here we explore a variety of few ion-Coulomb crystal conformations by regulating appropriate confinement strengths along the radial and axial directions of a linear radio-frequency trap and investigate their rotation under the influence of an asymmetrically placed Gaussian cooling beam. Specifically, we present a detailed theoretical characterization of the radiation-pressure induced rotation of a two-ion crystal inside the trap. We also present experimental data with which the theoretical calculations agree very well. Our work opens up the investigation of circular, elliptical, planar as well as non-planar ion rotation. |
Thursday, June 3, 2021 3:24PM - 3:36PM Live |
U09.00008: Microwave-driven high-fidelity quantum logic with 43Ca+ Marius Weber, Clemens Löschnauer, Jochen Wolf, Kaitlin Gili, Joseph Goodwin, Thomas Harty, Ryan K Hanley, Andrew Steane, David Lucas Magnetic field gradients produced in the near-field of a conductor carrying microwave current are sufficiently large to facilitate strong coupling between a trapped ion’s spin and motional degrees of freedom [1, 2]. Using this technique, we have previously shown that near-field microwave control of trapped-ion qubits is possible with two-qubit gate fidelities of 99.7(1) % [3], a fidelity which is approaching the state-of-the-art previously attained using laser-driven techniques. |
Thursday, June 3, 2021 3:36PM - 3:48PM Live |
U09.00009: Experimental quantum-enhanced bosonic learning machine with trapped ions Chi-Huan Nguyen, KO-WEI TSENG, Jaren H Gan, Gleb Maslennikov, Dzmitry Matsukevich The infinite-dimensional Hilbert space of bosonic systems can be utilized as the feature space for quantum machine learning. This approach offers a hardware-efficient solution with potential quantum speedups to the classification of both classical and quantum data. Here we demonstrate a quantum-enhanced bosonic learning machine with a system of trapped Yb171 ions. We encode information into the motional states of ions using a universal embedding circuit and apply a constant-dept SWAP test to measure the overlap of the states. We highlight the application of the bosonic learning machine by implementing the unsupervised K-mean algorithm to recognize a pattern in a set of high-dimensional quantum states. Using the discovered clusters as a training data set for the supervised k-NN algorithm, we demonstrate the classification of unknown quantum states with high accuracy. |
Thursday, June 3, 2021 3:48PM - 4:00PM Live |
U09.00010: Implementation of Ising-type interaction via phase stable Raman addressing in a cryogenic trapped-ion quantum simulator Arinjoy De, Lei Feng, Wen Lin Tan, Christopher R Monroe Trapped-ion quantum simulators are great platforms to explore wide-range of many-body systems. In such a simulator, we engineer tunable long-range spin-spin interaction between the qubits encoded in the hyperfine clock state of 171Yb+, using the Molmer-Sorensen (MS) entangling gate protocol [1]. An accurate simulation of many-body systems requires extensive spatial and temporal phase coherences of MS gate protocol, typically limited by the phase fluctuations due to optical path instabilities and ions' motion [2]. We demonstrate an Ising-type interaction using Raman addressing beams, which is insensitive to such phase fluctuations. We chose appropriate laser frequencies so that the momentum transfer to the ion from the red and blue sideband transition are in opposite direction, which eliminates the dependence of the qubit's phases on optical path lengths of the driving laser fields [3]. We further characterize and compare this phase-insensitive scheme with the usual phase-sensitive implementation of the Ising-type Hamiltonian and explore the benefits and limitations of both schemes. |
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