Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session H10: Rydberg Atom Arrays |
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Chair: Joonhee Choi, Stanford Room: 207 |
Wednesday, June 7, 2023 8:00AM - 8:12AM |
H10.00001: State-dependent potentials for the ground and clock state in ultracold ytterbium Tim O Hoehn, Etienne Staub, Guillaume Brochier, David Gröters, Bharath Hebbe Madhusudhana, Nelson Darkwah Oppong, Monika Aidelsburger The ground and meta-stable clock state pair in ytterbium provides an excellent resource for quantum metrology, simulation and computation applications. Being capable of individually addressing the two optical clock qubit states in a state-selective manner enhances the controllability of such systems, allowing for novel methods for state preparation, read-out or simulation schemes. Utilizing high-resolution clock spectroscopy, we present the first measurements of the Yb ground-state tune-out wavelength and of two new magic wavelengths as well as a route towards the determination of the clock-state tune-out wavelength. We further showcase how this will be used in our hybrid tweezer-lattice experiment to probe and engineer lattice gauge theories, using state-dependent potentials to robustly implement local gauge invariance. |
Wednesday, June 7, 2023 8:12AM - 8:24AM |
H10.00002: Rydberg synthetic dimensions with singlet Rydberg states in strontium Yi Lu, Chuanyu Wang, Robert A Brienza, Soumya K Kanungo, Tom C Killian, F B Dunning Rydberg states provide a flexible platform for the construction of synthetic dimensions for quantum simulation of particle motion through lattice potentials. We report results of synthetic dimensions experiments using mm-wave coupled strontium singlet Rydberg states, which correspond to individual sites in the synthetic lattice. We have characterized the resonant frequencies and AC stark shifts of nS-(n+1)S, nS-nP and nS-nD transitions in the range of n=56-70 in 84Sr. Coherence times of up to ~40us were observed for these mm-wave transitions with Rabi coupling frequencies on the order of a few 100kHz, which is an improvement over previous work with triplet Rydberg series [1]. In a simulation of the Su-Schrieffer-Heeger (SSH) Hamiltonian with its topologically protected edge states, we will report progress towards expanding the size of the synthetic space and probing the time evolution of populations in the Rydberg states. |
Wednesday, June 7, 2023 8:24AM - 8:36AM |
H10.00003: Exploring quench dynamics as a shortcut to adiabaticity in programmable atoms arrays Alexander Lukin, Alexei Bylinskii, Jesse Amato-Grill, Florian Huber, Sergio Cantu, Boris Braverman, Benjamin Schiffer, Dominik Wild, Rhine Samajdar, Maskara Nishad, Cain Maddie, Donggyu Kim, Nathan Gemelke, Mikhail D Lukin The ability to prepare ground states of quantum Hamiltonians via an adiabatic protocol is typically determined by the smallest energy gap during quantum evolution. This poses a challenge for large quantum systems, in particular in instances where the minimum gap scales super-exponentially with system size. We experimentally investigate the breakdown of the quantum adiabatic algorithms for such hard instances of the maximum independent set problem and demonstrate a method to circumvent this limitation. Using QuEra's Aquila programmable quantum simulator based on Rydberg atom arrays, we experimentally realize a hybrid adiabatic-quench-adiabatic protocol as a remedy to the diverging adiabatic timescale and find that it significantly outperforms adiabatic algorithms. We observe quantum-scar-like dynamics for different quench durations, demonstrating that a sweep-quench-sweep approach quantum algorithm can provide a shortcut to adiabaticity for a certain class of problems where adiabatic algorithms fail. |
Wednesday, June 7, 2023 8:36AM - 8:48AM |
H10.00004: Many-body localized discrete time crystal using Rydberg dressing Anupam Mitra, Tameem Albash, Grant Biedermann, Ivan H Deutsch Time crystals are an example of non-equilibrium quantum many-body phases, and these phases have been demonstrated on noisy intermediate scale quantum (NISQ) systems like superconducting circuits [1], nitrogen vacancy centers [2], dipolar systems [3] and trapped ions. Recently, a discrete time crystal using many-body localization was proposed, and demonstrated using superconducting qubits [1, 5]. [TA1] [AM2] We propose the implementation of a many-body localized discrete time crystal in a 1D array of qubits encoded in neutral atoms. We describe the implementation using time-periodic Floquet dynamics with alternating one-qubit rotations and two-qubit entanglers with spatial disorder. One-qubits gates are implemented using collective addressing of qubit states of the atoms and the two-qubit entanglers are implemented using the Van der Waals interactions between highly excited Rydberg states through adiabatic Rydberg dressing gates [6]. We analyze sources of imperfections and decoherence and discuss the implementation of the time crystal phase using contemporary experiments. We also show evidence towards a simple matrix product state description of the time crystal phase, suggesting that the many-body localized discrete time crystal may be an instance of a phenomenon that is both robust to noise and efficiently simulatable [TA3] [AM4] using classical computers. |
Wednesday, June 7, 2023 8:48AM - 9:00AM |
H10.00005: Towards a 171Yb atom array in a near-concentric cavity Neville Chen, Calvin Sun, Aakash V, Nathan Zachar, Yaashnaa Singhal, Healey Kogan, Jacob Covey Neutral atom arrays have been demonstrated to be a promising architecture for quantum computing. In particular, 171-ytterbium has been shown to be an excellent atomic species for computation due to its nuclear spin of 1/2. We expand upon this architecture by adding an optical cavity that strongly couples to the atomic array, thereby enabling high fidelity readout at readout times close to 3 orders of magnitude faster than the typical few 10s of milliseconds. Moreover, the cavity can be used to enhance the collection of photons on the telecom transition for sending quantum information between nodes in a quantum network to a second computation node. In this talk, we discuss our designs of the platform to support both functionalities. We use a Fabry-Perot cavity in the near-concentric geometry, which would create a tightly focused spot of waist radius roughly 13 (21) μm at a wavelength of 556 (1390) nm. We have generated a MOT in this system and are working towards trapping atoms in a clock-magic tweezer array. We will describe our progress in exploring this novel cavity QED system atom-by-atom. |
Wednesday, June 7, 2023 9:00AM - 9:12AM |
H10.00006: Nondestructive readout of nuclear spin qubits in a 171Yb atom array William Huie, Xiye Hu, Lintao Li, Zhubing Jia, Jacob Covey Neutral atom arrays have seen increasing attention and development as a platform for quantum information science; the I = 1/2 nuclear spin in 171Yb is emerging as a promising system in which to implement quantum information processing. With an array of atoms in tweezers at the magic trapping wavelength for the optical clock transition, we demonstrate consecutive, nondestructive readouts of the nuclear spin states and present Rabi oscillations with second-scale decay rates. We also present work on excitation to the metastable “clock” state and coherently convertible, dual-type nuclear spin qubits, as well as efforts toward remote entanglement generation. These results constitute an important step towards resource- and time-efficient measurement-based quantum computation and, with the metastable nuclear spin qubit, telecom-band quantum networking. |
Wednesday, June 7, 2023 9:12AM - 9:24AM |
H10.00007: Neutral-Atom Based Quantum Computing with Nuclear-Spin Qubits, Part I Krish Kotru We present progress toward a neutral-atom based quantum computer. Our architecture uses the nuclear spin degree of freedom in the ground states of alkaline-earth and alkaline-earth-like atoms to define a highly stable qubit with long coherence times. Building on this foundation, we implement and present progress on the various capabilities required for quantum computation, such as atom rearrangement, state-dependent readout, and gate operations. |
Wednesday, June 7, 2023 9:24AM - 9:36AM |
H10.00008: Neutral-Atom Based Quantum Computing with Nuclear-Spin Qubits, Part II Matthew Norcia We present progress toward a neutral-atom based quantum computer. Our architecture uses the nuclear spin degree of freedom in the ground states of alkaline-earth and alkaline-earth-like atoms to define a highly stable qubit with long coherence times. Building on this foundation, we present progress on the development of our next-generation machines, including trapping, preparation, coherent manipulation, and detection of our qubit array. |
Wednesday, June 7, 2023 9:36AM - 9:48AM |
H10.00009: A cryogenic neutral atom optical tweezer array ting you tan, Ting-Wei Hsu, Zhenpu Zhang, Matteo Marinelli, Daniel H Slichter, Adam M Kaufman, Cindy A Regal Scalable ultracold Rydberg atom arrays provide an intriguing platform for programmable quantum computation. We present a new system for the control of 2D Rydberg qubit arrays of 87Rb atoms embedded in a cryogenic environment. The setup leverages two main features: a low-vibration cryostat and a high optical access vacuum chamber. Compared to conventional room-temperature setups, cryopumping improves the atom vacuum lifetime to fully leverage the scalability of Rydberg platforms, and a 30 K environment extend the Rydberg lifetime to several times its value at room temperature. The high-optical access vacuum chamber will allow the creation and control of a large array using a 2D optical lattice with the site-resolved addressability and interaction control aided by optical tweezers. We will harness a bi-chromatic magic lattice to provide identical confinement for both ground and Rydberg states. We report our results on trapping atoms within the cryogenic environment, as well as preliminary results on qubit control. |
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