Publications Christian F. ROOS
2025
Preprints
- Bounded-Error Quantum Simulation via Hamiltonian and Lindbladian Learning arXiv:2511.23392
- Spin-Locking Spectroscopy of Harmonic Motion arXiv:2510.08732
Article
- Measuring full counting statistics in a trapped-ion quantum simulator PRL 135, 160601 (2025).
2024
Articles
- Characterization of ion-trap-induced ac magnetic fields Phys. Rev. A 110, 63101 (2024).
- Motional-state analysis of a trapped ion by ultranarrowband composite pulses Phys. Rev. A 110, 53103 (2024).
- Observing the quantum Mpemba effect in quantum simulations PRL 133, 10402 (2024).
- Correlation Spectroscopy with Multiqubit-Enhanced Phase Estimation Phys. Rev. X 14, 24 (2024).
2023
Preprint
- Single-ion optical autocorrelator arXiv:2312.03679
Articles
- Exploring Large-Scale Entanglement in Quantum Simulation Nature 624, 539 (2023).
- Observation of magnon bound states in the long-range, anisotropic Heisenberg model Phys. Rev. X 13, 031017-12 (2023).
- Sideband thermometry of ion crystals PRX Quantum 4, 40346 (2023).
- Experimental observation of thermalization with noncommuting charges PRX Quantum 4, 20318 (2023).
- Controlling two-dimensional Coulomb crystals of more than 100 ions in a monolithic radio-frequency trap PRX Quantum 4, 20317 (2023).
- Quantum-enhanced sensing on optical transitions through finite-range interactions Nature 621, 740 (2023).
2022
Articles
- Controlling long ion strings for quantum simulation and precision measurements Phys. Rev. A 105, 52426 (2022).
- Observing emergent hydrodynamics in a long-range quantum magnet Science 376, 720 (2022).
2021
Article
- Ultraviolet Laser Pulses with Multigigahertz Repetition Rate and Multiwatt Average Power for Fast Trapped-Ion Entanglement Operations Phys. Rev. Applied 15, 24054 (2021).
2020
Articles
- Polarization-gradient cooling of 1D and 2D ion Coulomb crystals New J. Phys. 22, 103013 (2020).
- Quantum information scrambling in a trapped-ion quantum simulator with tunable range interactions Phys. Rev. Lett. 124, 240505 (2020).
- Cross-Platform Verification of Intermediate Scale Quantum Devices Phys. Rev. Lett. 124, 10504 (2020).
2019
Articles
- Ultrafast coherent excitation of a Ca+ ion New J. Phys. 21, 83025 (2019).
- Self-verifying variational quantum simulation of lattice models Nature 569, 360 (2019).
- Statistical correlations between locally randomized measurements: a toolbox for probing entanglement in many-body quantum states Phys. Rev. A 99, 52323 (2019).
- Frequency measurement of the 1S0,F=5/2 to 3P1,F=7/2 transition of 27Al+ via quantum logic spectroscopy with 40Ca+ New J. Phys. 21, 103003 (2019).
- Probing Renyi entanglement entropy via randomized measurements Science 364, 260 (2019).
- Environment-assisted quantum transport in a 10-qubit network Phys. Rev. Lett. 122, 50501 (2019).
2018
Articles
- Quantum chemistry calculations on a trapped-ion quantum simulator Phys. Rev. X 8, 31022 (2018).
- Observation of Entangled States of a Fully Controlled 20-Qubit System Phys. Rev. X 8, 21012 (2018).
2017
Articles
- Efficient tomography of a quantum many-body system Nature Phys. 13, 1158 (2017).
- Direct observation of dynamical quantum phase transitions in an interacting many-body system Phys. Rev. Lett. 119, 80501 (2017).
- Revealing quantum statistics with a pair of distant atoms Phys. Rev. Lett. 119, 160401 (2017).
2016
Article
- Electromagnetically-induced-transparency ground-state cooling of long ion strings Phys. Rev. A 93, 53401 (2016).
2015
Articles
- Sympathetic cooling and detection of a hot trapped ion by a cold one New J. Phys. 17, 103001 (2015).
- Measurement of dipole matrix elements with a single trapped ion Phys. Rev. Lett. 115, 143003 (2015).
- Spectroscopy of interacting quasiparticles in trapped ions Phys. Rev. Lett. 115, 100501 (2015).
2014
Articles
- Quasiparticle engineering and entanglement propagation in a quantum many-body system Nature 511, 202 (2014).
- Experimental Violation of Multipartite Bell Inequalities with Trapped Ions Phys. Rev. Lett. 112, 100403 (2014).
2013
Articles
- A quantum information processor with trapped ions New J. Phys. 15, 123012 (2013).
- Measurement-based quantum computation with trapped ions Phys. Rev. Lett. 111, 210501 (2013).
- Experimental generation of quantum discord via noisy processes Phys. Rev. Lett. 111, 100504 (2013).
- Entanglement-enhanced detection of single-photon scattering events Nature Photon. 7, 633 (2013).
- Entanglement growth in quench dynamics with variable range interactions Phys. Rev. X 3, 031015 (2013).
2012
Articles
- Viewpoint: Moving traps offer fast delivery of cold ions Physics 5, 94 (2012).
- Quantum tomography in position and momentum space Eur. Phys. J. D 66, 222 (2012).
- News and Views: Simulating magnetism Nature 484, 461 (2012).
- Quantum simulations with trapped ions Nature Phys. 8, 277 (2012).
2011
Articles
- Quantum simulation of quantum field theories in trapped ions Phys. Rev. Lett. 107, 260501 (2011).
- Quantum simulation of the Majorana equation and unphysical operations Phys. Rev. X 1, 021018 (2011).
- Relativistic quantum mechanics with trapped ions New J. Phys. 13, 095003 (2011).
- Universal Digital Quantum Simulation with Trapped Ions Science 334, 57 (2011).
- Simulating open quantum systems: from many-body interactions to stabilizer pumping New J. Phys. 13, 085007 (2011).
- An open-system quantum simulator with trapped ions Nature 470, 491 (2011).
- Quantum simulation of the Klein paradox with trapped ions Phys. Rev. Lett. 106, 060503 (2011).
Proceeding
- Quantum simulation of relativistic quantum physics with trapped ions 22nd International Conference on Atomic Physics (Cairns, Australia, 2010-07-25) J. Phys. Conf. Ser. 264, 012020 (2011).
2010
Articles
- Experimental multiparticle entanglement dynamics induced by decoherence Nature Phys. 6, 943 (2010).
- Klein tunneling and Dirac potentials in trapped ions Phys. Rev. A 82, 020101(R) (2010).
- Short-time-interaction quantum measurement through an incoherent mediator Phys. Rev. A 81, 062126 (2010).
- Realization of a Quantum Walk with One and Two Trapped Ions Phys. Rev. Lett. 104, 100503 (2010).
- Compatibility and noncontextuality for sequential measurements Phys. Rev. A 81, 022121 (2010).
- Quantum simulation of the Dirac equation Nature 463, 71 (2010).
2009
Articles
- Realization of universal ion-trap quantum computation with decoherence-free qubits Phys. Rev. Lett. 103, 200503 (2009).
- Theory of cross phase modulation for the vibrational modes of trapped ions DFG - Physik, Math. u. Geowissen. 373, 422 (2009).
- Absolute frequency measurement of the 40Ca+ 4s 2S1/2 - 3d 2D5/2 clock transition Phys. Rev. Lett. 102, 023002 (2009).
- Optimal control of entangling operations for trapped-ion quantum computing Phys. Rev. A 79, 012312 (2009).
- Deterministic entanglement of ions in thermal states of motion 11, 023002 (2009).
- High-fidelity entanglement of 43Ca+ hyperfine clock states Phys. Rev. A 79, 020304 (2009).
- State-independent experimental test of quantum contextuality Nature 460, 494 (2009).
Proceedings
- Absolute frequency measurement of the 40Ca+ S1/2-D5/2 clock transition Proceedings of the 7th symposium on frequency standards and metrology 7th symposium on frequency standards and metrology (Pacific Grove, 2008-10-05) , 108 (2009).
- Ca+ quantum bits for quantum information processing Physica Scripta T137, 014008 (2009).
2008
Articles
- Ion trap quantum gates with amplitude-modulated laser beams 10, 013002 (2008).
- Dynamics of entanglement Nature Phys. 4, 97 (2008).
- Towards fault-tolerant quantum computing with trapped ions Nature Phys. 4, 463 (2008).
- Nonlinear coupling of continuous variables at the single quantum level Phys. Rev. A 77, 040302(R) (2008).
- Geometric phase gate on an optical transition for ion trap quantum computation Phys. Rev. A 77, 050303(R) (2008).
- Experimental quantum information processing with 43Ca+ ions Phys. Rev. A 77, 062306 (2008).
- Precision measurement of the branching fractions of the 4p 2P3/2 decay of Ca II Eur. Phys. J. D 50, 13 (2008).
- Quantum computing with trapped ions Physics Reports 469, 155-203 (2008).
Proceeding
- Quantum information processing and Ramsey spectroscopy with trapped ions Laser Spectroscopy: Proceedings of the XVIII International Conference (ICOLS) (Telluride, USA, 2007-06-24) , 53 (2008).
2007
Articles
- Robust state preparation of a single trapped ion by adiabatic passage J. Mod. Opt. , 1541 (2007).
- Measurement of the hyperfine structure of the S1/2-D5/2 transition in 43Ca+ Phys. Rev. A 75, 032506 (2007).
- Quantum teleportation with atoms: quantum process tomography 9, 211 (2007).
- High-fidelity ion-trap quantum computing with hyperfine clock states URL
- Precision spectroscopy with two correlated atoms 89, 483 (2007).
2006
Articles
- Designer atoms for quantum metrology Nature 443, 319 (2006).
- Generalized spin-queezing inequalities in N-qubit systems Phys. Rev. A 74, 052319 (2006).
- Process tomography of ion trap quantum gates Phys. Rev. Lett. 97, 220407 (2006).
Proceedings
- Controlling three atomic qubits Physical Realizations of Quantum Computing , 108 (2006).
- Long lived entangled states Foundations of Quantum Mechanics in the Light of New Technology ISQM-Tokyo (Tokyo, Japan, 2005-08-22) , 33 (2006).
- Precision spectroscopy with entangled states: Measurement of electric quadrupole moments Atomic physics 20 (Innsbruck, Austria, 2006-07-16) , 111-118 (2006).
2005
Articles
- Scalable multi-particle entanglement of trapped ions Nature 438, 646 (2005).
- Robust Entanglement 81, 151 (2005).
- New experimental and theoretical approach to the 3d ²D-level lifetimes of ⁴⁰Ca⁺ Phys. Rev. A 71, 032504 (2005).
Proceedings
- Teleportation with Atoms Atomic Physics (Rio De Janeiro) 19, 341-349 (2005).
- Entanglement of trapped ions Laser Spectroscopy ICOLS XVII, 392 (2005).
2004
Articles
- Control and Measurment of Three-Qubit Entangled States Science 304, 1478 (2004).
- Bell States of Atoms with Ultralong Lifetimes and Their Tomographic State Analysis Phys. Rev. Lett. 92, 220402 (2004).
- Spontaneous Emission Lifetime of a Single Trapped Ca+ Ion in a High Finesse Cavity Phys. Rev. Lett. 92, 203002 (2004).
- Ion Trap Quantum Computing with Ca+ Ions Quant. Inf. Proc. 3, 1-5 (2004).
- Deterministic quantum teleportation with atoms Nature 429, 734 (2004).
2003
Articles
- How to realize a universal quantum gate with trapped ions Appl. Phys. B Las. Opt. 77, 789 (2003).
- Realization of the Cirac-Zoller controlled-NOT quantum gate Nature 422, 408 (2003).
- Continuous loading of a non-dissipative atom trap 61, 187 (2003).
- Injection of a cold atomic beam into a magnetic guide Laser Phys. 13, 605 (2003).
- Propagation of guided atoms Comm. Nonlin. Sci. Num. 8, 315 (2003).
2002
Article
- Loading of a cold atomic beam into a magnetic guide Eur. Phys. J. D 20, 107 (2002).
Proceedings
- Laser Cooling of trapped ions Laser Physics at the limit , 243-260 (2002).
- Sideband cooling and state manipulation: Application in precision spectroscopy Proc. 6th Symp. Frequency Standards and Metrology , 376-384 (2002).
2001
Articles
- Laser cooling with electromagnetically induced transparency: Application to trapped samples of ions or neutral atoms Appl. Phys. B Las. Opt. 73, 807 (2001).
- Sympathetic ground state cooling and coherent manipulation with two-ion-crystals J. Opt. B: Quantum Semiclass. Opt. 3, 34 (2001).
Proceedings
- Towards quantum information with trapped Calcium ions Quantum Communication, Computing and Measurement 3 , 179 (2001).
- Experiments towards quantum information with trapped Calcium ions Atomic Physics (Proceedings of the ICAP 2000) 17, 130 (2001).
2000
Articles
- Experimental demonstration of ground state laser cooling with electromagnetically induced transparency Phys. Rev. Lett. 85, 5547 (2000).
- Sympathetic ground state cooling and coherent manipulation with two-ion-crystals J. Opt. B: Quantum Semiclass. Opt. 3, S3 (2000).
- Speed of ion trap quantum information processors Phys. Rev. A 62, 042305 (2000).
- Investigating a qubit candidate: Spectroscopy on the S1/2 to D5/2 transition of a trapped calcium ion in a linear Paul trap Phys. Rev. A 61, 023405 (2000).
- Ground state cooling, quantum state engineering, and study of decoherence in Paul traps J. Mod. Opt. 47, 2573 (2000).
- Addressing and cooling of single ions in Paul traps Fortschr. Phys. 48, 623 (2000).
1999
Article
- Quantum state engineering on an optical transition and decoherence in a Paul trap Phys. Rev. Lett. 83, 4713 (1999).
Proceedings
- Single ions in Paul traps Laser Spectroscopy XIV, 246 (1999).
- Single Ions in Paul traps Decoherence: Theoretical, Experimental and Conceptual Problems , (1999).
1997
Article
- Random networks of crosslinked manifolds J. Phys. A: Math. Gen. 30, 1967 (1997).