PhD Position in Physics

VU University of Amsterdam

Institution: Vrije Universiteit Amsterdam (VU Amsterdam)
Faculty: Faculty of Science
Department/Group: Quantum Metrology and Laser Applications (QMLA) at LaserLaB Amsterdam
Location: Amsterdam, Netherlands
Contract type: Full-time PhD
Duration: Initially 1 year, extendable up to 4 years (with PhD dissertation at the end)
Salary: €3,059 – €3,881 gross per month (full-time, CAO NU scale P)
Working hours: 38–40 hours/week
Application deadline: Until the position is filled

Project Overview

The PhD project focuses on precision frequency measurement of the fundamental 1S–2S transition in a single trapped He⁺ ion, with the goals to:

• Test higher-order contributions to Quantum Electrodynamics (QED) and search for new physics
• Measure the alpha-particle charge radius with unprecedented precision
• Provide an independent check of the fundamental Rydberg constant

Experimental approach:

• Trapping a He⁺ ion with a Be⁺ ion in a Paul trap
• Sympathetic laser cooling of He⁺ via Be⁺
• Exciting He⁺ with ultrashort pulses at 790 nm and 32 nm (high-harmonic generation)
• Using quantum interference techniques at attosecond timescales
• Leveraging atomic clocks and ultra-stable lasers

Techniques involved:

• Laser physics: frequency combs, ultrafast lasers, high-harmonic generation
• Ultrahigh vacuum and ion-trapping
• Quantum-state control, laser cooling, and quantum-logic spectroscopy
• Experimental design (CAD), electronics, and programming for experimental control

Candidate Profile

Required qualifications:

• Master’s degree in Physics or a related field
• Interest/affinity for atomic, molecular, and optical physics (AMO)
• Team-oriented, curious, enthusiastic, and eager to learn

Desirable experience:

• Experimental physics techniques
• Quantum technology, spectroscopy, or laser physics

Language: Proficiency in English

Work Environment & Benefits

• Work in an international team (~20 scientists)
• Access to state-of-the-art laser labs and infrastructure at LaserLaB
• Full-time 38–40 hours/week with holiday entitlement
• 8% holiday allowance, 8.3% year-end bonus, commuting contribution
• Optional personalized benefits package
• Strong focus on diversity, inclusion, and interdisciplinary collaboration

Application Instructions

Required documents:

• Detailed CV
• Diploma
• Cover letter / motivation letter
• Names and contact details of 2 references

Application method: Via VU Amsterdam application portal (no email applications)

Contact person:

• Prof. Dr. Kjeld Eikema — kjeld.eikema@vu.nl

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