Quantum @ DTU Physics
DTU Physics
DTU Physics - QPIT section
Quantum Physics and Information Technology
bigQ Center of Excellence
Center for Macroscopic Quantum States
Ulrik Lund Andersen
Section head, Center leader
Alexander
Huck
Jonatan
Bohr Brask
Jonas
Neergaard-Nielsen
Tobias
Gehring
>65 PhDs, postdocs, engineers, admin, faculty
>20 nationalities
Many international collaborators and visitors
Research focus
Continuous-variable
quantum information
Solid-state spin systems
Quantum information theory
Quantum optomechanics
State-of-the art labs, hardware
Spin-offs
Quantum random number generators
CV-QKD systems
Diamond magnetic field sensors
Selected topics
Continuous-variable
quantum information
Solid-state spin systems
Quantum information theory
Quantum optomechanics
CV-QKD
Quantum sensing and learning
Measurement-based quantum computing
Quantum networking, distributed protocols
Gaussian Boson Sampling
Other squeezed light applications
Non-Gaussian states (cats, GKP, multimode)
Lithium niobate integrated sources
Liu, Brunel, et al., Science 389, 1332 (2025)
Quantum advantage in learning
Quantum advantage in learning
~ 15 min
~ 20 Myr
Liu, Brunel, et al., Science 389, 1332 (2025)
Madsen, et al., Science 366, 369 (2019)
Cluster state QC platform
A continuous-variable measurement-based quantum computer
based on temporally encoded cluster states.
Cluster state QC platform
Universal Gaussian gate set implemented by homodyne measurements
Madsen, et al., Nat. Phys. 17, 1018 (2021)
Distributed sensing
Estimate a global (distributed) parameter:
Different task
Estimating/sensing an unknown phase shift
Distributed sensing
Estimate a global (distributed) parameter:
Different task
Estimating/sensing an unknown phase shift
Distributed sensing
Estimating/sensing an unknown phase shift
Guo et al., Nat. Phys. 16, 281 (2020)
Networked cluster states
Ongoing work: entangle cluster states in different labs for distributed computing
50~60 m fiber link
Integrated quantum sources
Squeezed, entangled and cluster states from LNOI resonators
Integrated quantum sources
0.2 dB two-mode-squeezing (entanglement) from two sources on same chip
