• Review on spin qubits

    G. Burkard, T. D. Ladd, A. Pan, J. M. Nichol, and J. R. Petta, Rev. Mod. Phys. 95, 025003 (2023).

    Spin qubits, employing the fundamental quantum property of intrinsic angular momentum of individual electrons and nuclei, continue to develop and evolve. This review summarizes progress in four current qubit types: single spin qubits, donor spin qubits, singlet triplet spin qubits, and exchange-only spin qubits. 

    Read more

  • Research focus

    Our research is focused on quantum computing, spin physics and spin qubits, hybrid quantum systems, 2D materials, time-domain quantum optics.

    The figure shows an artist's impression of electron spin qubits inside semiconductor quantum dots.

    Please find out more.

Current news

Ability of error correlations to improve the performance of variational quantum algorithms

J. Kattemölle and G. Burkard
Phys. Rev. A 107, 042426 (2023)

Selected as Editor's Suggestion.

The quantum approximate optimization algorithm (QAOA) has the potential of providing a useful quantum advantage on noisy intermediate-scale quantum (NISQ) devices. The effects of uncorrelated noise on variational quantum algorithms such as QAOA have been studied intensively. Recent experimental results, however, show that the errors impacting NISQ devices are significantly correlated. We introduce a…

Read more

 

 

Fingerprints of Qubit Noise in Transient Cavity Transmission

P. M. Mutter, G. Burkard
Phys. Rev. Lett. 128, 236801 (2022)

Noise affects the coherence of qubits and thereby places a bound on the performance of quantum computers. We theoretically study a generic two-level system with fluctuating control parameters in a photonic cavity and find that basic features of the noise spectral density are imprinted in the transient transmission through the cavity. We obtain analytical expressions for generic noise and proceed to study the cases of quasistatic,…

Read more