CATS@UCD
  • Home
  • Team
  • Projects
  • Publications
  • Events
Work Package 2: Quantum speed limits in many-body systems
More, as was famously noted, is different. When dealing with quantum many-body systems this statement becomes particularly insightful as we can see the emergence of criticality, where despite a well defined microscopic description, non-trivial and singular behaviours can be exhibited. The use of one-dimensional spin systems as archetypal registers for quantum processing devices means developing a clear understanding of criticality is of utmost importance and equally developing effective techniques to control these systems is paramount. The discovery by Lieb and Robinson showing that communication along nearest neighbour interacting spin systems is bounded by an effective “space-time cone”, somewhat in analogy to the causal light cone, has led to profound developments in the understanding and simulation of complex many-body quantum systems. Interestingly, the quantum speed limit also has been shown to be fundamental in revealing the dynamical features, such as the critical slowing down, when transitioning a critical point in the same systems and recent advances have indicated the dominant role the quantum speed limit plays when attempting to realise precisely these dynamics.

Objective and impact: The main goal of WP2 is to use these two fundamental bounds to develop effective control methods requiring the minimal resources. We will analyse the tools necessary to control critical systems, offering a clear framework for their experimental feasibility. WP2 is thus endowed with broad fundamental and practical relevance. Regarding the former, it will deepen the understanding of criticality and unite two fundamental principles in quantum physics. While for the latter, it will establish the minimal experimental resources necessary to simulate these most remarkable systems.
Picture
Picture
Publications
  1. Discrete and generalized phase space techniques in critical quantum spin chains
    Zakaria Mzaouali, Steve Campbell, and Morad El Baz
    Phys. Lett. A 383, 125932 (2019)
  2. Energetic cost of quantum control protocols
    Obinna Abah, Ricardo Puebla, Anthony Kiely, Gabriele De Chiara, Mauro Paternostro, and Steve Campbell
    New J. Phys. 21, 103048 (2019)
  3. Orthogonality catastrophe as a consequence of the quantum speed limit
    Thomás Fogarty, Sebastian Deffner, Thomas Busch, and Steve Campbell
    Phys. Rev. Lett. 124, 110601 (2020)
  4. Kibble-Zurek scaling in quantum speed limits for shortcuts to adiabaticity
    Ricardo Puebla, Sebastian Deffner, and Steve Campbell
    Phys. Rev. Research 2,  032020(R) (2020)
  5. Fast and robust magnon transport in a spin chain
    Anthony Kiely and Steve Campbell
    New J. Phys. 23, 033033 (2021)
  6. Work statistics and symmetry breaking in an excited state quantum phase transition
    Zakaria Mzaouali, Ricardo Puebla, John Goold, Morad El Baz, and Steve Campbell
    ​Phys. Rev. E 103, 032145 (2021)
  7. Periodically refreshed baths to simulate open quantum many-body dynamics
    Archak Purkayastha, Giacomo Guarnieri, Steve Campbell, Javier Prior, and John Goold
    Phys. Rev. B 104, 045417 (2021)
  8. Counterdiabatic control in the impulse regime
    Eoin Carolan, Anthony Kiely, and Steve Campbell
    Phys. Rev. A 105, 012605 (2022) 
  9. Periodically refreshed quantum thermal machines
    Archak Purkayastha, Giacomo Guarnieri, Steve Campbell, Javier Prior, and John Goold
    Quantum 6, 801 (2022)
  10. Minimal action control method in quantum critical models
    Ainur Kazhybekova, Steve Campbell, and Anthony Kiely
    J. Phys. Commun. 6, 113001 (2022)
  11. Optimal Control in Disordered Quantum Systems
    Luuk Coopmans, Steve Campbell, Gabriele De Chiara, and Anthony Kiely
    Phys. Rev. Research 4, 043138 (2022)
  12. Non-Gaussian work statistics at finite time driving
    Krissia Zawadzki, Anthony Kiely, Gabriel T. Landi, and Steve Campbell
    Phys. Rev. A 107, 012209 (2023)
  13. Entropy of the quantum work distribution
    Anthony Kiely, Eoin O'Connor, Thomás Fogarty, Gabriel T. Landi, and Steve Campbell
    Phys. Rev. Research 5, L022010 (2023)
  14. Quantum work statistics of controlled evolutions
    Steve Campbell
    EPL 143, 68001 (2023)
  15. Multiparameter critical quantum metrology with impurity probes
    George Mihailescu, Abolfazl Bayat, Steve Campbell, and Andrew K. Mitchell
    Quantum Sci. Technol. 9, 035033 (2024)
Powered by Create your own unique website with customizable templates.
  • Home
  • Team
  • Projects
  • Publications
  • Events