Beating the limits with initial correlations

Daniel Basilewitsch, Rebecca Schmidt, Dominique Sugny, Sabrina Maniscalco, Christiane P. Koch

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
216 Downloads (Pure)


Fast and reliable reset of a qubit is a key prerequisite for any quantum technology. For real world open quantum systems undergoing non-Markovian dynamics, reset implies not only purification, but in particular erasure of initial correlations between qubit and environment. Here, we derive optimal reset protocols using a combination of geometric and numerical control theory. For factorizing initial states, we find a lower limit for the entropy reduction of the qubit as well as a speed limit. The time-optimal solution is determined by the maximum coupling strength. Initial correlations, remarkably, allow for faster reset and smaller errors. Entanglement is not necessary.

Original languageEnglish
Article number113042
Pages (from-to)1-16
JournalNew Journal of Physics
Issue number11
Publication statusPublished - 1 Nov 2017
MoE publication typeA1 Journal article-refereed


  • quantum control
  • state preparation
  • superconducting qubits

Fingerprint Dive into the research topics of 'Beating the limits with initial correlations'. Together they form a unique fingerprint.

Cite this