Erik Sjöqvist
Professor at Department of Physics and Astronomy; Materials Theory
- Mobile phone:
- +46 73 024 58 22
- E-mail:
- erik.sjoqvist@physics.uu.se
- Visiting address:
- Lägerhyddsvägen 5
SE-75237 Uppsala
Sweden - Postal address:
- Box 516
751 20 UPPSALA
Professor at Department of Physics and Astronomy; Materials Theory; Quantum Matter Theory
- Mobile phone:
- +46 73 024 58 22
- E-mail:
- erik.sjoqvist@physics.uu.se
- Visiting address:
- Lägerhyddsvägen 5
SE-75237 Uppsala
Sweden - Postal address:
- Box 516
751 20 UPPSALA
More information is available to staff who log in.
Keywords
- geometric phase
- quantum information
- quantum mechanics
Biography
Erik Sjöqvist is a professor in quantum information theory at Uppsala University since 2005. He received his D.Phil at Uppsala University in 1995 and has been post-doc at University of Durham (UK), Oxford University (UK), and the Atomic Institute in Vienna during 1996-1999. He has been assistant professor 2000-2004 and received his docent degree in 2001. He has been Visiting Research Professor at Centre for Quantum Technologies at NUS, Singapore 2010-2013.
Research
Geometry and topology in quantum mechanics.
Key publications:
E. Sjöqvist et al., Geometric phase for mixed states in interferometry, Phys. Rev. Lett. 85, 2845 (2000). https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.85.2845
N. Johansson and E. Sjöqvist, Optimal topological test for degeneracies of real Hamiltonians, Phys. Rev. Lett. 92, 060406 (2004). https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.92.060406
E. Sjöqvist et al., Non-adiabatic holonomic quantum computation, New J. Phys. 14, 103035 (2012). https://iopscience.iop.org/article/10.1088/1367-2630/14/10/103035/meta
M. Johansson et al., Topological phases and multiqubit entanglement, Phys. Rev. A 85, 032112 (2012). https://journals.aps.org/pra/abstract/10.1103/PhysRevA.85.032112
E. Sjöqvist, Geometry along evolution of mixed quantum states, Phys. Rev. Research 2, 013344 (2020). https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.013344
Publications on arXiv:
Citations:
Publications
Recent publications
- Quantum spin systems (2024)
- Coupled spin-lattice dynamics from the tight-binding electronic structure (2024)
- Coupled atomistic spin-lattice simulations of ultrafast demagnetization in 3d ferromagnets (2024)
- iSWAP-type geometric gates induced by paths on the Schmidt sphere (2024)
- Transmon probe for quantum characteristics of magnons in antiferromagnets (2023)
All publications
Articles
- Quantum spin systems (2024)
- Coupled spin-lattice dynamics from the tight-binding electronic structure (2024)
- Coupled atomistic spin-lattice simulations of ultrafast demagnetization in 3d ferromagnets (2024)
- iSWAP-type geometric gates induced by paths on the Schmidt sphere (2024)
- Transmon probe for quantum characteristics of magnons in antiferromagnets (2023)
- Genuinely noncyclic geometric gates in two-pulse schemes (2023)
- Tunable phonon-driven magnon-magnon entanglement at room temperature (2023)
- Influence of nonlocal damping on magnon properties of ferromagnets (2023)
- Metaheuristic conditional neural network for harvesting skyrmionic metastable states (2023)
- Genetic-tunneling driven energy optimizer for spin systems (2023)
- Geometric and holonomic quantum computation (2023)
- Time-optimal holonomic quantum computation (2022)
- Dark path holonomic qudit computation (2022)
- Entanglement duality in spin-spin interactions (2022)
- Transitionless quantum driving in spin echo (2022)
- Toward a measurement of the effective gauge field and the Born-Huang potential with atoms in chip traps (2022)
- Universal quantum computation and quantum error correction using discrete holonomies (2022)
- Heat-conserving three-temperature model for ultrafast demagnetization in nickel (2022)
- Adiabatic spin dynamics and effective exchange interactions from constrained tight-binding electronic structure theory (2022)
- Magnon-magnon entanglement and its quantification via a microwave cavity (2021)
- Heisenberg and anisotropic exchange interactions in magnetic materials with correlated electronic structure and significant spin-orbit coupling (2021)
- High-order finite difference method for the Schrödinger equation on deforming domains (2021)
- Majority gate for two-dimensional ferromagnets lacking inversion symmetry (2021)
- Connection between magnetic interactions and the spin-wave gap of the insulating phase of NaOsO3 (2021)
- Exchange constants for local spin Hamiltonians from tight-binding models (2021)
- Realizing nonadiabatic holonomic quantum computation beyond the three-level setting (2021)
- Hierarchy of magnon mode entanglement in antiferromagnets (2020)
- Monopole Field Textures in Interacting Spin Systems (2020)
- Geometry along Evolution of Mixed Quantum States (2020)
- Parallelity of mixed quantum ensembles (2020)
- Geometric phase of very slow neutrons (2020)
- Equation of motion and the constraining field in ab initio spin dynamics (2020)
- Environment-assisted holonomic quantum maps (2019)
- Entangling power of holonomic gates in atom-based systems (2018)
- Path-shortening realizations of nonadiabatic holonomic gates (2018)
- The role of quantum coherence in dimer and trimer excitation energy transfer (2017)
- Proposed neutron interferometry test of Berry's phase for a circulating planar spin (2017)
- Robust paths to realize nonadiabatic holonomic gates (2017)
- Composite nonadiabatic holonomic quantum computation (2017)
- Rydberg-atom-based scheme of nonadiabatic geometric quantum computation (2017)
- Single-shot realization of nonadiabatic holonomic quantum gates in decoherence-free subspaces (2017)
- Geometric phases for mixed states of the Kitaev chain (2016)
- Spin-electric Berry phase shift in triangular molecular magnets (2016)
- Quantum nonlocality in the excitation energy transfer in the Fenna-Matthews-Olson complex (2016)
- Single-loop multiple-pulse nonadiabatic holonomic quantum gates (2016)
- Nonadiabatic holonomic single-qubit gates in off-resonant Λ systems (2016)
- Conceptual aspects of geometric quantum computation (2016)
- Realization of a holonomic quantum computer in a chain of three-level systems (2015)
- Geometric phases in quantum information (2015)
- Realization of adiabatic Aharonov–Bohm scattering with neutrons (2015)
- Fast non-Abelian geometric gates via transitionless quantum driving (2015)
- Universal Non-adiabatic Holonomic Gates in Quantum Dots and Single-Molecule Magnets (2014)
- Non-Abelian geometric phases in a system of coupled quantum bits (2014)
- Classification scheme of pure multipartite states based on topological phases (2014)
- Quantum computation in noiseless subsystems with fast non-Abelian holonomies (2014)
- Non-Abelian off-diagonal geometric phases in nano-engineered four-qubit systems (2013)
- Unifying Geometric Entanglement and Geometric Phase in a Quantum Phase Transition (2013)
- Comment on `Detecting non-Abelian geometric phases with three-level Λ systems' (2013)
- Three-qubit topological phase on entangled photon pairs (2013)
- Validity of the rotating-wave approximation in nonadiabatic holonomic quantum computation (2013)
- Topological phases and multiqubit entanglement (2012)
- Robustness of nonadiabatic holonomic gates (2012)
- Relative state measures of correlations in bipartite quantum systems (2012)
- Non-Adiabatic Holonomic Quantum Computation (2012)
- Non-adiabatic holonomic quantum computation in decoherence-free subspaces (2012)
- Non-Abelian quantum holonomy of hydrogen-like atoms (2011)
- Correlation-induced non-Abelian quantum holonomies (2011)
- Open system effects on slow light and electromagnetically induced transparency (2011)
- Global asymmetry of many-qubit correlations (2011)
- Geometric local invariants and pure three-qubit states (2011)
- Spin-orbit-coupled Bose-Einstein condensate in a tilted optical lattice (2010)
- Hidden parameters in open-system evolution unveiled by geometric phase (2010)
- Entanglement-induced geometric phase of quantum states (2010)
- Berry phase and fidelity susceptibility of the three-qubit Lipkin–Meshkov–Glick ground state (2010)
- Jahn-Teller-induced Berry phase in spin-orbit-coupled Bose-Einstein condensates (2009)
- Experimentally testable geometric phase of sequences of Everett's relative quantum states (2009)
- Nodal free geometric phases (2008)
- Holonomy for quantum channels (2008)
- A new phase in quantum computation (2008)
- Non-Abelian generalization of off-diagonal geometric phases (2007)
- Operational approach to the Uhlmann holonomy (2007)
- Noncyclic geometric changes of quantum states (2006)
- Geometric phase in weak measurements (2006)
- Manifestations of quantum holonomy in interferometry (2006)
- Weak cloning of an unknown quantum state (2006)
- Off-diagonal quantum holonomy along density operators (2005)
- Searching for degeneracies of real Hamiltonians using homotopy classification of loops in SO(n) (2005)
- Mixed-state non-Abelian holonomy for subsystems (2005)
- Adiabatic geometric phases in hydrogenlike atoms (2005)
- Adiabatic approximation for weakly open systems (2005)
- Kinematic approach to off-diagonal geometric phases of nondegenerate and degenerate mixed states (2005)
- Quantum adiabatic search with decoherence in the instantaneous energy eigenbasis (2005)
- Robustness of the adiabatic quantum search (2005)
- Optimal topological test for degeneracies of real Hamiltonians (2004)
- Geometry of decomposition dependent evolutions of mixed states (2004)
- Quantal interferometry with dissipative internal motion (2004)
- Comment on `Geometric phases for mixed states during cyclic evolutions' (2004)
- On the alleged nonlocal and topological nature of the molecular Aharonov-Bohm effect (2004)
- Kinematic approach to mixed state geometric phase in nonunitary evolution (2004)
- Effect of intersubsystem coupling on the geometric phase in a bipartite system (2004)
- Mixed state geometric phases, entangled systems, and local unitary transformations (2003)
- Generalization of the geometric phase to completely positive maps (2003)
- Off-diagonal geometric phases for mixed states (2003)
- Off-diagonal generalization of the mixed-state geometric phase (2003)
- Noncyclic geometric quantum computation (2003)
- Precession and interference in the Aharonov-Casher and scalar Aharonov-Bohm effect (2003)
- Noncyclic mixed state phase in SU(2) polarimetry (2003)
- Measuring Pancharatnam's relative phase for SO(3) evolutions using spin polarimetry (2003)
- Reply to Comment on `Locality and topology in the molecular Aharonov-Bohm effect' (2003)
- Uhlmann's geometric phase in presence of isotropic decoherence (2003)
- Relation between geometric phases of entangled bi-partitesystems and their subsystems (2003)
- Reply to Comment on `Geometric phases for mixed states in interferometry' (2002)
- Towards a quantum Hall effect for atoms using electric fields (2002)
- Quantum computation using the Aharonov-Casher set up (2002)
- Comment on `Complementarity between Local and Nonlocal Topological Effects' (2002)
- Locality and topology in the molecular Aharonov-Bohm effect (2002)
- Quantal phase in split-beam interferometry (2001)
- Proposed interferometry test of noncyclic geometric phase (2001)
- Quantal phase for nonmaximally entangled photons (2000)
- Geometric phase for entangled spin pairs (2000)
- Degree of electron-nuclear entanglement in molecular states (2000)
- Anandan–Aharonov–Casher oscillations in a simply connected region (2000)
- Geometric phases for mixed states in interferometry (2000)
- Remarks on identical particles in de Broglie-Bohm theory (1999)
- Quantal trajectories for adiabatic and nonadiabatic regimes of vibronic systems (1999)
- Mobile flux line in an Aharonov-Bohm system (1999)
- Extending the quantal adiabatic theorem (1998)
- Analysis of electron transport in a two-dimensional structure using quantal trajectories (1998)
- Berry's phase in pilot-wave theory (1998)
- A quantum mechanical angle anholonomy (1997)
- Galilean noninvariance of geometric phase (1997)
- Geometric phase, quantum measurements, and the de Broglie-Bohm model (1997)
- Noncyclic geometric phase, coherent states, and the time-dependent variational principle (1997)
- Fractional statistics in Bohm's theory (1995)
- The molecular Aharonov-Bohm effect for bound states beyond the adiabatic approximation (1994)
Books
Chapters
Conferences
- On geometric phases for quantum trajectories (2006)
- Off-diagonal mixed state phases in unitary evolution (2003)
- Pancharatnam revisited (2002)
- Degree of electron-nuclear entanglement in the E x e Jahn-Teller system (1999)
- Geometric phase-shifts in pilot-wave theory (1995)
Other
