Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session C08: Quantum Simulation with Trapped IonsRecordings Available
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Chair: Allison Carter, NIST/CU Boulder Room: Salon 7/8 |
Tuesday, May 31, 2022 11:00AM - 11:12AM |
C08.00001: Trapped ions in optical tweezers Matteo Mazzanti, Rima X Schüssler, Clara Robalo Pereira, Zeger Egbert Dirk Ackerman, Zhenlin Wu, Juan D Arias Espinoza, Thomas Feldker, Arghavan Safavi-Naini, Rene Gerritsma We present progress on our experimental setup where we will engineer spin spin interactions between trapped ions, for such system the effective spin-spin interactions between the ions are mediated by the crystal phonons. |
Tuesday, May 31, 2022 11:12AM - 11:24AM |
C08.00002: Probing Many-Body Quantum Chaos on a Trapped Ion Quantum Simulator Kate S Collins, Arinjoy De, William N Morong, Lata Kh Joshi, Andreas Elben, Amit Vikram, Benoît Vermersch, Victor M Galitski, Peter Zoller, Christopher R Monroe It is challenging to identify characteristics of chaos in a quantum system. The spectral form factor (SFF) and its generalization, the partial spectral form factor (PSFF), provide information about the statistics of energy eigenvalues and eigenstates of a many-body quantum system. Recent work\footnote{L. K. Joshi \textit{et al.}, PRX \textbf{12}, 011018 (2022).} has developed an experimentally feasible protocol to measure the SFF and PSFF in quantum spin systems. This scheme enables the direct testing of universal random matrix theory and eigenstate thermalization hypothesis predictions of quantum chaotic systems. We present the implementation of this protocol on our trapped ion quantum simulator employing the use of local random rotations and measurements. |
Tuesday, May 31, 2022 11:24AM - 11:36AM |
C08.00003: Quantum simulation of 2D Weyl equation in a magnetic field Yue Jiang, Minglei Cai, Yukai Wu, Quanxin Mei, Wending Zhao, Xiuying Chang, Lin Yao, Li He, Zichao Zhou, Luming Duan Quantum simulation of relativistic quantum mechanics has been proposed and performed in well-controlled quantum systems like trapped ions. However, previous experiments only study 1D spatial dynamics, while properties like spin dynamics and response to magnetic fields that appear only in higher spatial dimensions remain unexplored. Here we simulate the dynamics of a Weyl particle in 2D, which is a minimal model to demonstrate nontrivial spin dynamics and coupling to external magnetic fields. We show the linear dispersion relation of free Weyl particles and the discrete Landau levels in a magnetic field, and we explicitly measure the spatial and spin dynamics from which the conservation of helicity can be verified. Our work demonstrates the trapped-ion system as a powerful quantum simulator, and extends its application in particle physics with the additional spatial and spin degrees of freedom. |
Tuesday, May 31, 2022 11:36AM - 11:48AM |
C08.00004: Quantum simulation of chemical dynamics on a trapped-ion quantum computer Alexander Rasmusson, Marissa D'Onofrio, Joshua Apanavicius, Philip Richerme Simulating the dynamics of quantum chemical systems is a promising application of quantum computers. While most quantum algorithms and experimental demonstrations have focused on calculations of electronic structure in molecules, a recently developed protocol [1] has proposed techniques to simulate nuclear dynamics as well. Expanding upon this protocol, we map the quantum nuclear Hamiltonian of a shared proton in 2,2'-bipyridine directly onto quantum gates that can be implemented on an ion-trap quantum computer. Exploiting underlying structures in the nuclear Hamiltonian, we reduce the number of required quantum gates to a level achievable by current NISQ-era devices. Finally, we implement our quantum circuit on IonQ's 11-qubit trapped-ion quantum processor, where the nuclear time-evolution operator is translated into an exact decomposition of quantum gates. We observe the full time dynamics of the nuclear wavepacket evolution in two dimensions, which enables us to extract its characteristic vibrational frequencies, and ultimately its complete energy eigenspectrum. Our approach offers a new paradigm for simulating quantum chemical dynamics problems using NISQ-era devices. |
Tuesday, May 31, 2022 11:48AM - 12:00PM |
C08.00005: Analog quantum simulation of chemical dynamics with a trapped-ion system Ting Rei Tan, Ryan J MacDonell, Tomas Navickas, Tim Wöhlers-Reichel, Arjun Rao, Michael Biercuk, Cornelius Hempel, Ivan Kassal The simulation of a quantum chemical system is challenging using conventional computers, particularly in strong vibronic (vibrational + electronic) coupling regimes where the Born-Oppenheimer approximation breaks down. We show that vibronic coupling Hamiltonians representing ultrafast molecular dynamics can be efficiently simulated on quantum systems with coupled internal states and bosonic modes. Furthermore, this "mixed qudit boson" (MQB) approach can be extended to time-domain measurements used to reproduce molecular absorption spectra. We present preliminary experimental results performed with a trapped-ion system. |
Tuesday, May 31, 2022 12:00PM - 12:12PM |
C08.00006: Digital Quantum Simulation of the Schwinger Model and Symmetry Protection with Trapped Ions Nhung H Nguyen, Minh C Tran, Yingyue Zhu, Alaina Green, Cinthia H Alderete, Zohreh Davoudi, Norbert M Linke Tracking the dynamics of physical systems in real time is a prime application of digital quantum computers. Using a trapped-ion system with up to six qubits, we simulate the real-time dynamics of a lattice gauge theory in 1+1 dimensions, i.e., the lattice Schwinger model, and demonstrate nonperturbative effects such as pair creation for times much longer than previously accessible. We study the gate requirement of two formulations of the model using the Suzuki-Trotter product formula, as well as the trade-off between errors from the ordering of the Hamiltonian terms, the Trotter step size, and experimental imperfections. To mitigate experimental errors, a recent symmetry-protection protocol for suppressing coherent errors and a symmetry-inspired post-selection scheme are applied. This work demonstrates the integrated theoretical, algorithmic, and experimental approach that is essential for efficient simulation of lattice gauge theories and other complex physical systems. |
Tuesday, May 31, 2022 12:12PM - 12:24PM |
C08.00007: Individual Addressing in a Two-Dimensional Ion Microtrap Array Using Global Laser Beams Justin F Niedermeyer, Nathan K Lysne, Andrew C Wilson, Daniel H Slichter, Dietrich Leibfried Two-dimensional arrays of ions trapped in individual, dynamically tunable microtraps are a promising technology for quantum computation and simulation. To simulate complex quantum systems such as coupled spins on a two-dimensional lattice in an ion microtrap array, it is useful to address individual ions with laser beams to engineer specific quantum states or to perform readout. However, the two-dimensional layout and µm-scale inter-ion distances in such arrays make addressing individual ions with separate laser beams challenging, especially as the number of ions increases. We will discuss the use of micromotion to address and read out selected ions in a three-ion microtrap array. We apply array-site-specific electric fields to trapped 9Be+ ions, moving them away from their pseudopotential minima to induce a controlled amount of micromotion along the wavevector(s) of the addressing beam(s) 1, 2. This changes the coupling of global laser beams to ions at these sites, enabling site-resolved individual ion addressing. We will present experimental results on fidelity and crosstalk of this micromotion-induced single-ion addressing technique. |
Tuesday, May 31, 2022 12:24PM - 12:36PM |
C08.00008: Parametric Amplification in a Penning Trap for Enhanced Quantum Simulation and Sensing Bryce Bullock, Matthew J Affolter, Jennifer F Lilieholm, Allison L Carter, John J Bollinger, Wenchao Ge Trapped ion systems have been shown to be an ideal platform for quantum simulation and sensing in part due to the exquisite control of their collective motional modes (phonons). Parametric amplification to squeeze these collective modes offers a potential improvement in the experimental sensitivity to small displacements, and an enhanced phonon mediated spin-spin interaction for entanglement generation. |
Tuesday, May 31, 2022 12:36PM - 12:48PM |
C08.00009: High quality, individual optical manipulation of ions in a trapped-ion quantum simulator Sainath Motlakunta, Chung-You Shih, Nikhil Kotibhaskar, Anthony Vogliano, Jingwen Zhu, Roland Hablutzel Marrero, Darian Mclaren, Rajibul Islam S.Motlakunta, C.Y. Shih, N.Kotibhaskar, A.Vogliano, J.Zhu, D. Mclaren, R.Hablützel, R.Islam |
Tuesday, May 31, 2022 12:48PM - 1:00PM |
C08.00010: Hamiltonian Engineering on a hyper-sphere with a trapped ion quantum simulator Qiming Wu, Yue Shi, Jiehang Zhang Trapped ion systems utilize the collective normal modes to mediate effective spin-spin interactions, thereby realizing quantum computers and simulators. We demonstrate ways to engineer Hamiltonians with a trapped ion chain by addressing the axial modes, in which the mode spectrum is sparse and has near equal mode spacings. This allows us to generate flexible spin-spin interactions with mode addressing while eliminating all residual spin-phonon interactions. We demonstrate quantum simulations of spin Hamiltonians in high-dimensional geometries by applying frequency-modulated two-tone laser fields to sequentially address different modes. By choosing the gate time and interaction strength of each layer, we encode different connectivity configurations of qubits and apply a digital-analog model to implement Ising Hamiltonians on a square-lattice (4 qubits), a sphere (6 qubits), and a four-dimensional hyper-sphere (8 qubits). Our results can be applied to fast parallel gates and stimulate a new direction of digital-analog hybrid quantum simulation. |
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