Please join us for our first AMO/QI seminar of the Fall semester! Dr. Rainer Blatt, University of Innsbruck will be our speaker. He will give a talk titled: Quantum Computation and Quantum Simulation With Strings of Trapped Ca+ Ions

Abstract:
This talk reviews the advanced capabilities of the Innsbruck trapped-ion quantum computer [1}. We present an overview of the available quantum toolbox and discuss the scalability of the approach. With up to 50 ion qubits under our control, we conduct quantum simulations to investigate quantum transport [2] and hydrodynamics features [3}. We also use the quantum toolbox to optimize quantum metrology parameters [4] and demonstrate quantum-enhanced sensing on an optical transition through collective quantum correlations [5]. Additionally, we explore large-scale entanglement using quantum simulations [6]. To protect quantum computers from noise, we encode logical quantum information redundantly into multiple qubits using error- correcting codes. Furthermore, we ensure that all operations on the quantum register adhere to a fault-tolerant circuit design to prevent the spread of uncontrolled errors when manipulating logical quantum states with imperfect operations. We demonstrate a fault-tolerant universal set of gates on two logical qubits in the trapped-ion quantum computer [7].

[1]  I. Pogorelov et al., PRX Quantum 2, 020343 (2021)

[2]  C. Maier et al., Phys. Rev. Lett. 122, 050501 (2019)

[3]  M. K. Joshi et al., Science 376, 720 (2022)

[4]  C. D. Marciniak et al., Nature 603, 604 (2022)

[5]  J. Franke et al., Nature 621, 740 (2023)

[6]  M. K. Joshi et al., Nature 624, 539 (2023)

[7]  L. Postler et al., Nature 605, 675 (2022)