Project description

Subject: Physics.

The Trapped Ion Quantum Technology group at Stockholm University invites applications for a PhD position on our trapped Rydberg ion project. The successful PhD applicant will design and build a cryogenic ion trapping experiment for realising a fast quantum processor with trapped Rydberg ions. The cryogenic environment will reduce decoherence due to black-body radiation.

Trapped Rydberg ions are a new system for quantum computation. By laser pulses the ions’ outermost electron is excited to a high-lying Rydberg orbital [1]. Such Rydberg ions are million times bigger than ions in the ground state, and due to their size obtain very peculiar properties. In particular, trapped ions can be entangled via a strong Rydberg interaction in less than an microsecond [2]. This method supports fast entangling gates in large ions crystals, thus enabling a fast trapped ion quantum computer.

The experimental PhD project will take place in the Trapped Ion Quantum Technology group at Stockholm University and is part of the Swedish Graduate School in Quantum Technologies funded by the Wallenberg Centre for Quantum Technology - WACQT. For more information see



[1] G. Higgins, et al., Coherent control of a single trapped Rydberg ion, Physical Review Letters 119 (22), 220501 (2017).

[2] C Zhang, et al., Sub-microsecond entangling gate between trapped ions via Rydberg interaction, arXiv:1908.11284.


Ref. No. SU FV-1193-21

Closing date: 23 April 2021

Complete information here.