Quantum Initiative: Quantum Lunch

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.

The organizing committee includes Malcolm Boshier (P-21), Lukasz Cincio (T-4), Diego Dalvit (T-4), Changhyun Ryu (P-21) , Nikolai Sinitsyn (T-4), Rolando Somma (T-4), Yigit Subasi (T-4), Christopher Ticknor (T-1), and Wojciech Zurek (T-4).

For more information, or to nominate a speaker, contact Yigit Subasi or Lukasz Cincio.

To add your name to the Quantum Lunch email list, contact Kacy Hopwood.

Thursday November 2, 2017
12:30 PM - 2:00 PM

Speaker: Michael Martin (Sandia National Laboratory)

Technical Host: Malcolm Boshier

TOPIC: Quantum science with laser-dressed Rydberg atoms

Abstract
Neutral atom-based qubits are highly scalable and controllable. With optical excitation of high-lying, strongly interacting Rydberg states, one can achieve on-demand, laser-controlled interactions for quantum logic operations. We present studies of entangling operations from a two-atom system employing single ultracold cesium atoms that interact via single-photon laser coupling to a Rydberg level [1]. Importantly, the Rydberg-dressed many-body Hamiltonian permits pairwise and beyond-pairwise interaction regimes. In a two-atom system, we have demonstrated isomorphism to the Jaynes-Cumming model of cavity QED, which will scale to larger atom numbers and enable the application of techniques from quantum control [2,3]. We describe a detailed study of a controlled-phase (CPHASE) gate that is insensitive to the detrimental effects of atomic motion and spurious light shifts, and that should enable high-quality entangling operation between atom pairs or within larger ensembles. We also present work towards larger-scale systems employing reconfigurable traps formed via digital holography, with the goal of scaling the successes of the two-atom system.

[1] Y.-Y. Jau et al., "Entangling atomic spins with a Rydberg-dressed spin-flip blockade," Nat. Phys. 12, 71-74 (2016)
[2] J. Lee et al., "Demonstration of the Jaynes-Cummings ladder with Rydberg-dressed atoms," Phys. Rev.A 95, 041801(R) (2106).
[3] T. Keating et al., "Arbitrary Dicke-State Control of Symmetric Rydberg Ensembles," Phys. Rev. Lett. 117, 213601 (2016)