SESSION 10: Neutral atoms

Chair: (Poul Jessen (University of Arizona))
8:30am - 9:15amMark Saffman, University of Wisconsin-Madison (invited)
Scalable quantum computing with neutral atoms
Abstract. One of the daunting challenges in developing a practical quantum computer is the need to scale to a very large number of qubits. Neutral atoms are one of the most promising approaches for meeting this challenge. I will describe our recent results implementing quantum gates, including new adiabatic pulse sequences, in a large 2D array of atomic qubits.
9:15am - 9:45amHikaru Tamura, University of Michigan
Phase-matched scattering from a reconfigurable array of trapped neutral atoms
Abstract. We investigate phase-matched scattering from arrays of cold atoms that are confined in optical tweezers in one- and two-dimensional geometries. For a linear chain, we observe phase-matched reflective scattering in a cone about the symmetry axis of the array that scales as the square of the number of atoms in the chain. For two linear chains of atoms, the phase-matched reflective scattering is enhanced or diminished as a result of Bragg scattering. Such scattering can be used for mapping collective states within an array of neutral atoms onto propagating light fields and for establishing quantum links between separated arrays.
9:45am - 10:15amAnupam Mitra, University of New Mexico CQuIC
Generation of high-fidelity Molmer-Sorenson interactions between neutral atoms using adiabatic Rydberg dressing
Abstract. Arrays of optically trapped neutral atoms interacting through the Rydberg dipole blockade mechanics is a promising platform for scalable quantum information processors including universal quantum computers, analog quantum simulators, and quantum sensors. Critical to the performance of these devices is high-fidelity two-qubit interactions. We show that by strongly dressing ground states with Rydberg states in the presence of the blockade we can implement high fidelity entangling interactions on clock-state qubits. This gate can be made robust to imperfections such as atomic thermal motion, laser inhomogeneities, and an imperfect Rydberg blockade. In particular, we show that the error in implementing a two-qubit entangling gate is dominated by errors in the single atom light shift, and this can be easily mitigated using adiabatic dressing, interleaved with a spin echo. This implements a two-qubit Mølmer-Sørenson gate. Current modest experimental parameters allow a gate fidelity of >99.5%, and a path to higher gate fidelities is achievable with stronger Rydberg blockade, longer Rydberg state lifetimes and larger Rabi frequencies. We also study the application of the Mølmer-Sørenson interaction to many-body systems with multiple qubits.

SQuInT Chief Organizer
Akimasa Miyake, Associate Professor

SQuInT Co-Organizer
Brian Smith, Associate Professor UO

SQuInT Program Committee
Postdoctoral Fellows:
Markus Allgaier (UO OMQ)
Sayonee Ray (UNM CQuIC)
Pablo Poggi (UNM CQuIC)
Valerian Thiel (UO OMQ)

SQuInT Event Co-Organizers (Oregon)
Jorjie Arden
Holly Lynn

SQuInT Event Administrator (Oregon)
Brandy Todd

SQuInT Administrator (CQuIC)
Gloria Cordova
505 277-1850

SQuInT Founder
Ivan Deutsch, Regents' Professor, CQuIC Director

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