Realizing Distance-Selective Interactions in a Rydberg-Dressed Atom Array.

Simon Hollerith,Valentin Walther,Immanuel Bloch,Antonio Rubio-Abadal,David Wei,Johannes Zeiher,Pascal Weckesser,Christian Gross,Rick Van Bijnen,Jun Rui,Andreas Kruckenhauser,Daniel Adler,Kritsana Srakaew

doi:10.1103/physrevlett.128.113602

Abstract

Measurement-based quantum computing relies on the rapid creation of large-scale entanglement in a register of stable qubits. Atomic arrays are well suited to store quantum information, and entanglement can be created using highly-excited Rydberg states. Typically, isolating pairs during gate operation is difficult because Rydberg interactions feature long tails at large distances. Here, we engineer distance-selective interactions that are strongly peaked in distance through off-resonant laser coupling of molecular potentials between Rydberg atom pairs. Employing quantum gas microscopy, we verify the dressed interactions by observing correlated phase evolution using many-body Ramsey interferometry. We identify atom loss and coupling to continuum modes as a limitation of our present scheme and outline paths to mitigate these effects, paving the way towards the creation of large-scale entanglement.

Highlights

Measurement-based quantum computing relies on the rapid creation of large-scale entanglement in a register of stable qubits
Isolating pairs during gate operation is difficult because Rydberg interactions feature long tails at large distances
The one-way or measurement-based quantum computer [1] has been suggested as an alternative to usual gate-based digital quantum computers. Contrary to the latter approach, the entanglement required for a calculation is created up front by creating a highly entangled cluster state [2], and the subsequent circuit is imprinted through controlled local measurements and subsequent feedback

Summary

Introduction

Measurement-based quantum computing relies on the rapid creation of large-scale entanglement in a register of stable qubits. Realizing Distance-Selective Interactions in a Rydberg-Dressed Atom Array We engineer distance-selective interactions that are strongly peaked in distance through off-resonant laser coupling of molecular potentials between Rydberg atom pairs. We verify the dressed interactions by observing correlated phase evolution using many-body Ramsey interferometry.

Results

Conclusion