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Ognyan Oreshkov


Email: ognyan.oreshkov (at) ulb.be
Phone: +32-2-650 29 56
Fax: +32-2-650 29 41
Address: QuIC - Ecole Polytechnique de Bruxelles
Université Libre de Bruxelles
50 av. F. D. Roosevelt - CP 165/59
B-1050 Bruxelles

Short biography

Ognyan Oreshkov is a Research Associate of the F.R.S.-FNRS. He was born and grew up in Bulgaria, where he studied Theoretical and Mathematical Physics at the University of Sofia. He then moved to Los Angeles to pursue doctoral studies in Physics at the University of Southern California, where he obtained his Ph.D. in 2008 under the supervision of Todd A. Brun. Following his graduation, he worked as a postdoctoral researcher at the Quantum Information Group at the Universitat Autònoma de Barcelona (2008-2009) and at the Quantum Foundations and Quantum Information Theory Group at the University of Vienna (2010). From 2011 to 2016, Ognyan was a postdoctoral fellow at QuIC, where he was funded by a Marie Curie Intra-European Fellowship for Career Development and an F.R.S.-FNRS Chargé de Recherches Fellowship. After nine months as a Research Associate at the University of Oxford in 2017, Ognyan returned to QuIC as a permanent F.R.S.-FNRS researcher.

Research interests

  • Time and causal structure in quantum theory
  • Symmetries and quantum reference frames
  • Foundations of quantum mechanics
  • Quantum information and computation
  • Quantum error correction



J. Wechs, C. Branciard, and O. Oreshkov,
Existence of processes violating causal inequalities on time-delocalised subsystems,
Nat. Commun. 14, 1471 (2023), https://arxiv.org/abs/2201.11832.

J. Barrett, R. Lorenz, and O. Oreshkov,
Cyclic Quantum Causal Models,
Nat. Commun. 12, 885 (2021), http://arxiv.org/abs/2002.12157.

T. Hoffreumon and O. Oreshkov,
The Multi-round Process Matrix,
Quantum 5, 384 (2021), http://arxiv.org/abs/2005.04204.

A. Hertz, O. Oreshkov, and N. J. Cerf,
Multicopy uncertainty observable inducing a symplectic-invariant uncertainty relation in position and momentum phase space,
Phys. Rev. A 100, 052112 (2019), http://arxiv.org/abs/1907.09183.

O. Oreshkov,
Time-delocalized quantum subsystems and operations: on the existence of processes with indefinite causal structure in quantum mechanics,
Quantum 3, 206 (2019), http://arxiv.org/abs/1801.07594.

O. Oreshkov and C. Giarmatzi,
Causal and causally separable processes,
New J. Phys. 18, 093020 (2016), http://arxiv.org/abs/1506.05449.

O. Oreshkov and N. J. Cerf,
Operational quantum theory without predefined time,
New J. Phys. 18, 073037 (2016), http://arxiv.org/abs/1406.3829.

O. Oreshkov and N. J. Cerf,
Operational formulation of time reversal in quantum theory,
Nature Phys. 11, 853-858 (2015), http://arxiv.org/abs/1507.07745.

C. N. Gagatsos, O. Oreshkov, and N. J. Cerf,
Majorization relations and entanglement generation in a beam splitter,
Phys. Rev. A 87, 042307 (2013), http://arxiv.org/abs/1301.5229.

O. Oreshkov, F. Costa, and C. Brukner,
Quantum correlations with no causal order,
Nat. Commun. 3, 1092 (2012), http://arxiv.org/abs/1105.4464.

C. Bény and O. Oreshkov,
Approximate simulation of quantum channels,
Phys. Rev. A 84, 022333 (2011), http://arxiv.org/abs/1103.0649.

O. Oreshkov, J. Calsamiglia, R. Munoz-Tapia, and E. Bagan,
Optimal signal states for quantum detectors,
New J. Phys. 13, 073032 (2011), http://arxiv.org/abs/1103.2365.

O. Oreshkov and J. Calsamiglia,
Adiabatic Markovian dynamics,
Phys. Rev. Lett. 105, 050503 (2010), http://arxiv.org/abs/1002.2219.

C. Bény and O. Oreshkov,
General conditions for approximate quantum error correction and near-optimal recovery channels,
Phys. Rev. Lett. 104, 120501 (2010), http://arxiv.org/abs/0907.5391.

O. Оreshkov and J. Calsamiglia,
Comment on “Nongeometric Conditional Phase Shift via Adiabatic Evolution of Dark Eigenstates: A New Approach to Quantum Computation”,
Phys. Rev. Lett. 103, 188901 (2009), http://arxiv.org/abs/0910.5694.

O. Oreshkov,
Holonomic quantum computation in subsystems,
Phys. Rev. Lett. 103, 090502 (2009), http://arxiv.org/abs/0905.1249.

O. Oreshkov, T. A. Brun, and D. A. Lidar,
Scheme for fault-tolerant holonomic computation on stabilizer codes,
Phys. Rev. A 80, 022325 (2009), http://arxiv.org/abs/0904.2143.

O. Оreshkov and J. Calsamiglia,
Distinguishability measures between ensembles of quantum states,
Phys. Rev. A 79, 032336 (2009), http://arxiv.org/abs/0812.3832.

O. Оreshkov, T. A. Brun, and D. A. Lidar,
Fault-tolerant holonomic quantum computation,
Phys. Rev. Lett. 102, 070502 (2009), http://arxiv.org/abs/0806.0875.

O. Oreshkov, D. A. Lidar, and T. A. Brun,
Operator quantum error correction for continuous dynamics,
Phys. Rev. A 78, 022333 (2008), http://arxiv.org/abs/0806.3145.

B. Shaw, M. M. Wilde, O. Oreshkov, I. Kremsky, and D. A. Lidar,
Encoding one logical qubit into six physical qubits,
Phys. Rev. A 78, 012337 (2008), http://arxiv.org/abs/0803.1495.

O. Oreshkov,
Robustness of operator quantum error correction with respect to initialization errors,
Phys. Rev. A 77, 032333 (2008), http://arxiv.org/abs/0709.3533.

H. Krovi, O. Oreshkov, M. Ryazanov, and D. A. Lidar,
Non-Markovian dynamics of a qubit coupled to an Ising spin bath,
Phys. Rev. A 76, 052117 (2007), http://arxiv.org/abs/0707.2096.

O. Oreshkov and T. A. Brun,
Continuous quantum error correction for non-Markovian decoherence,
Phys. Rev. A 76, 022318 (2007), http://arxiv.org/abs/0705.2342.

O. Oreshkov and T. A. Brun,
Infinitesimal local operations and differential conditions for entanglement monotones,
Phys. Rev. A 73, 042314 (2006), http://arxiv.org/abs/quant-ph/0506181.

O. Oreshkov and T. A. Brun,
Weak measurements are universal,
Phys. Rev. Lett. 95, 110409 (2005), http://arxiv.org/abs/quant-ph/0503017.

Book chapters

O. Оreshkov,
Continuous-time quantum error correction,
In “Quantum error correction”, edited by D. A. Lidar and T. A. Brun, (Cambridge University Press, 2013), http://arxiv.org/abs/1311.2485.

O. Оreshkov, T. A. Brun, and D. A. Lidar,
Fault tolerance for holonomic quantum computation,
In “Quantum error correction”, edited by D. A. Lidar and T. A. Brun, (Cambridge University Press, 2013), http://arxiv.org/abs/1312.0165.


R. Kunjwal and O. Oreshkov,
Nonclassicality in correlations without causal order,

T. Hoffreumon and O. Oreshkov,
Projective characterization of higher-order quantum transformations,

E. Castro-Ruiz and O. Oreshkov,
Relative subsystems and quantum reference frame transformations,

J. Barrett, R. Lorenz, and O. Oreshkov,
Quantum Causal Models,

O. Oreshkov,
Topics in quantum information and the theory of open quantum systems,
Ph.D. thesis, University of Southern California (2008), http://arxiv.org/abs/0812.4682.


The Fund For Scientific Research (F.R.S.-FNRS),

The John Templeton Foundation (https://www.templeton.org),
Project (International Consortium): The Quantum Information Structure of Spacetime

FWO and F.R.S.-FNRS,
Project (Excellence of Science Consortium): Creating highly entangled quantum states in the NISQ era

Wallonia-Brussels Federation (ARC Consolidation Grant),
Project: Quantum Physics and Information with Indefinite Causal Structure,