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 S08: Quantum Gates, Algorithms, and Architectures IIILive
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Chair: Henry Luo, JQI |
Thursday, June 3, 2021 10:30AM - 10:42AM Live |
S08.00001: Universal quantum computation and quantum error correction with ultracold atomic mixtures Valentin Kasper, Daniel González Cuadra, Apoorva Hegde, Andy Xia, Alexandre Dauphin, Felix Huber, Eberhard Tiemann, Maciej Lewenstein, Fred Jendrzejewski, Philipp Hauke Quantum information platforms made great progress in the control of many-body entanglement and the implementation of quantum error correction, but it remains a challenge to realize both in the same setup. Here, we propose a mixture of two ultracold atomic species as a platform for universal quantum computation with long-range entangling gates, while providing a natural candidate for quantum error-correction. In this proposed setup, one atomic species realizes localized collective spins of tunable length, which form the fundamental unit of information. The second atomic species yields phononic excitations, which are used to entangle collective spins. Finally, we discuss a finite-dimensional version of the Gottesman-Kitaev-Preskill code to protect quantum information encoded in the collective spins, opening up the possibility to universal fault-tolerant quantum computation in ultracold atom systems. |
Thursday, June 3, 2021 10:42AM - 10:54AM Live |
S08.00002: A system for coherent site-resolved control of an array of neutral-atom qubits, part I Mickey P McDonald, Krish Kotru, Brian J Lester, Remy P Notermans, Kayleigh Cassella, Stanimir Kondov, Albert Ryou, Tsung-Yao Wu, Nicole Crisosto, Lucas Peng, Eli Megidish, Peter Battaglino, Sandeep Narayanaswami, Ciro Nishiguchi, Raul Atkinson, Emme Yarwood, Joseph Lauigan, Robin Coxe, Jonathan P King, Benjamin Bloom Individually-trapped neutral atoms are a promising technology for scalable quantum computation. Such systems offer high readout fidelity, control over excursions to Rydberg states for qubit interactions, and spatial manipulation of many-atom arrays. Our quantum computer creates qubits from individually trapped 87Sr atoms, whose nuclear spin structure allows us to make use of extremely long-lived qubit states in the electronic ground state, and whose complex level structure enables both fast cooling and reliable shelving. We present our recent progress building and proving out this machine, with an emphasis on state preparation, imaging, and dynamic rearrangement of occupied trap sites. Our machine typically operates by loading atoms into a large 2-dimensional array of optical tweezers, and closed-loop manipulation allows for rearrangement into arbitrary patterns using a secondary set of dynamically controllable traps. We discuss our imaging scheme, including cooling, its limitations, and how we achieve high-fidelity state-selective readout. |
Thursday, June 3, 2021 10:54AM - 11:06AM Live |
S08.00003: A system for coherent site-resolved control of an array of neutral-atom qubits, part II Krish Kotru, Brian Lester, Mickey P McDonald, Kayleigh Cassella, Lucas Peng, Remy Notermans, Stanimir Kondov, Albert Ryou, Tsung-Yao Wu, Nicole Crisosto, Eli Megidish, Peter Battaglino, Sandeep Narayanaswami, Ciro Nishiguchi, Raul Atkinson, Emme Yarwood, Joseph Lauigan, Robin Coxe, Jonathan P King, Benjamin J Bloom Individually-trapped neutral atoms are a promising technology for scalable quantum computation. Such systems offer high readout fidelity, control over excursions to Rydberg states for qubit interactions, and spatial manipulation of many-atom arrays. Here we present a method for achieving single-qubit control over individual atomic qubits confined in arrays of optical tweezers. This approach differs from previous implementations of single qubit control that required global addressing of the atomic ensemble; by leveraging advances in agile RF instrumentation we achieve phase and amplitude control of the light incident on each atom, giving access to full SU(2) control of the Hilbert space. Capitalizing on the long coherence times of strontium, we aim to scale this quantum control to arbitrarily large arrays of qubits in a parallelizable manner. Here, we demonstrate the coherent, site-resolved single-qubit manipulations of an array of neutral-atom qubits. |
Thursday, June 3, 2021 11:06AM - 11:18AM Live |
S08.00004: Long-term continuous operation of an AMO platform for neutral atom quantum computing Remy P Notermans, Nicole Crisosto, Robin Coxe, Brian J Lester, Krish Kotru, Mickey P McDonald, Stanimir Kondov, Albert Ryou, Tsung-Yao Wu, Kayleigh Cassella, Lucas Peng, Eli Megidish, Peter Battaglino, Sandeep Narayanaswami, Ciro Nishiguchi, Raul Atkinson, Emme Yarwood, Joseph Lauigan, Jonathan P King, Benjamin J Bloom Building a scalable individually-trapped neutral atom quantum computing platform is both a scientific and engineering challenge. Typically involving multiple laser systems, many optical paths, and miscellaneous electronic systems, providing and improving uptime of an entire platform can be an arduous task involving costly labor in a typical laboratory environment. |
Thursday, June 3, 2021 11:18AM - 11:30AM Live |
S08.00005: Fundamental limits of neutral atom entanglement using Rydberg dressing Anupam Mitra, Sivaprasad T Omanakuttan, Michael J Martin, Grant Biedermann, Ivan Deutsch The Rydberg blockade phenomenon has been used to entangle neutral Rubidium, Cesium, Strontium and Ytterbium atoms. Adiabatic Rydberg dressing, involving an adiabatic passage from ground states to Rydberg states and back, is a way of introducing the interaction energy of Rydberg atoms to ground state atoms to generate ground state entanglement with direct Rydberg excitation. Recently, we showed that adiabatic Rydberg dressing using one-photon transition from ground to Rydberg states and spin echo can be used to implement a Mølmer-Sørensen gate for neutral atoms that is robust to many experimental imperfections. We extend the analysis to study the implementation of rapid adiabatic passage using a two-photon transition, which does not require the use of an ultra-violet laser, and is easier to implement experimentally. We also study the fundamental limits to entanglement generation using the adiabatic Rydberg dressing paradigm and its scaling with Rabi frequency, detuning, interaction energy and Rydberg state lifetime. Finally, we explore the forces between Rydberg dressed atoms and find that the effective soft-core potential between Rydberg dressed ground states leads to negligible forces. We find that entangling gate fidelities comparable to the one-photon excitation are achievable with the two-photon excitation with experimental imperfections, providing a more experimentally-feasible approach to obtain high fidelity and robust gates for neutral atom-based quantum computation. |
Thursday, June 3, 2021 11:30AM - 11:42AM Live |
S08.00006: Quantum Reservoir Computing using Neutral Atoms Rodrigo Araiza Bravo, Khadijeh Najafi, Xun Gao, Susanne F Yelin The field of quantum neuromorphic computing takes inspiration from the brain to design learning protocols resilient to the noise in current NISQ devices. We introduce a quantum reservoir computer using arrays of neutral atoms. We show that the high control of state-of-the-art atom array experiments gives our proposal the power to simulate biological learning tasks and robust short-term memory. We draw parallels between our proposal and classical neuroscience models of neural circuits. Our proposal hopes to widen the applicability of current quantum computing platforms in both machine learning and computational neuroscience. |
Thursday, June 3, 2021 11:42AM - 11:54AM Live |
S08.00007: Towards noise-resilient quantum optimization Madelyn Cain, Leo X Zhou, Hannes Pichler, Soonwon Choi, Mikhail Lukin The adiabatic algorithm is a promising algorithm for finding the ground states of Hamiltonians. However, its implementation is generally sensitive to noise that causes excitations from the adiabatic ground state. Correcting these excitations in a fault-tolerant way is impractical for near-term experiments. Nevertheless, by co-designing implementations to address the dominant noise sources in a given experimental platform, one can significantly mitigate the effects of noise. In this work, we develop a framework for characterizing the effects of dissipation and non-adiabaticity on the adiabatic algorithm. We apply it to study intermediate-state spontaneous emission in neutral atom arrays during adiabatic evolution [Ebadi et al. arXiv:2012.12281]. We show that in systems of neutral atoms with Rydberg interactions, such spontaneous scattering is less destructive than the bare emission rates suggest. Next, we compare two classes of algorithms with identical Hamiltonian dynamics, and show that they have very different noise properties. We give simple conditions for choosing the more noise-robust version of the two. Finally, we design and analyze a STIRAP-inspired protocol which minimizes the number of emission events during the algorithm. |
Thursday, June 3, 2021 11:54AM - 12:06PM Live |
S08.00008: Quantum Optimal Control of Nuclear Spin for Quantum Logic with Qudits Sivaprasad T Omanakuttan, Anupam Mitra, Michael J Martin, Ivan Deutsch Quantum optimal control is a powerful tool for the robust realization of quantum information processing tasks such as preparation of nonclassical quantum states and implementation of unitary maps. We studied quantum optimal control of the the spin I=9/2 nucleus of 87 Sr, an alkaline earth atom that has attracted substantial recent attention for metrology, quantum simulation and quantum computing. By employing nuclear spin magnetic resonance in the presence of a laser-induced nonlinear AC Stark shift, the system is controllable; we can design any SU(10) unitary matrix acting on the d=10 dimensional manifold of nuclear magnetic sublevels. We design control waveforms that generate the fundamental gates required for universal qudit logic gates. We also study experimental trade-offs including the affects of decoherence and robustness to imperfections |
Thursday, June 3, 2021 12:06PM - 12:18PM Live |
S08.00009: Sub-ensemble qubit measurements in neutral atom quantum computers using state-selective EIT Felipe Giraldo Mejia, Aishwarya Kumar, Tsung-Yao Wu, Peng Du, David S. S Weiss The ability to measure a sub-ensemble of qubits is needed for both quantum error correction (QEC) and one-way quantum computation. However, in atomic systems it is difficult to protect nearby quantum information while some qubits are being measured. We propose a method to achieve this sub-ensemble state detection for neutral atom qubits using a combination of site-selective state transfers and electromagnetically-induced transparency (EIT). First, the qubits to be measured will be transferred out of the qubit basis and into two auxiliary magnetic sublevels. Second, EIT light will be turned on to protect all the magnetic sublevels except for one that is needed for detection. Both qubit states can be measured in turn, to check for atom loss. The measured atoms can be recooled and reinitialized into the qubit basis after detection. A simple extension of this method can also be used to measure qubit leakage errors. We will present our calculations for Cs but expect that the central ideas can be extended to other atomic systems. |
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