Publications
135 results found
Newman D, Mintert F, Nazir A, 2017, Performance of a quantum heat engine at strong reservoir coupling, Physical Review E: Statistical, Nonlinear, and Soft Matter Physics, Vol: 95, ISSN: 1539-3755
We study a quantum heat engine at strong coupling between the system and the thermal reservoirs. Exploiting a collective coordinate mapping, we incorporate system-reservoir correlations into a consistent thermodynamic analysis, thus circumventing the usual restriction to weak coupling and vanishing correlations. We apply our formalism to the example of a quantum Otto cycle, demonstrating that the performance of the engine is diminished in the strong coupling regime with respect to its weakly coupled counterpart, producing a reduced net work output and operating at a lower energy conversion efficiency. We identify costs imposed by sudden decoupling of the system and reservoirs around the cycle as being primarily responsible for the diminished performance, and we define an alternative operational procedure which can partially recover the work output and efficiency. More generally, the collective coordinate mapping holds considerable promise for wider studies of thermodynamic systems beyond weak reservoir coupling.
Witt B, Rudnicki L, Tanimura Y, et al., 2017, Exploring complete positivity in hierarchy equationsof motion, New Journal of Physics, Vol: 19, ISSN: 1367-2630
We derive a purely algebraic framework for the identi cation of hierarchyequations of motion that induce completely positive dynamics and demonstrate the applicability of our approach with several examples. We nd bounds on the violation of complete positivity for microscopically derived hierarchy equations of motion and construct well-behaved phenomenological models with strongly non-Markovian revivals of quantum coherence.
Haddadfarshi F, Mintert, 2016, High fidelity quantum gates of trapped ions mediated by a dissipative bus mode, New Journal of Physics, Vol: 18, ISSN: 1367-2630
We describe entangling quantum gates for trapped ions mediated bya dissipative bus mode and show that suitably designed, polychromatic controlpulses decrease ion-phonon entanglement substantially while maintaining the mediatedinteraction. In particular for multi-qubit gates this yields a signi cant improvement ingate performance.
Haddadfarshi F, Mintert F, 2016, High fidelity quantum gates of trapped ions in the presence of motional heating, NEW JOURNAL OF PHYSICS, Vol: 18, ISSN: 1367-2630
Nyman RA, Marelic J, Zajiczek LF, et al., 2016, Spatiotemporal coherence of non-equilibrium multimode photon condensates, New Journal of Physics, Vol: 18, ISSN: 1367-2630
We report on the observation of quantum coherence of Bose–Einstein condensed photons in an optically pumped, dye-filled microcavity. We find that coherence is long-range in space and time above condensation threshold, but short-range below threshold, compatible with thermal-equilibrium theory. Far above threshold, the condensate is no longer at thermal equilibrium and is fragmented over non-degenerate, spatially overlapping modes. A microscopic theory including cavity loss, molecular structure and relaxation shows that this multimode condensation is similar to multimode lasing induced by imperfect gain clamping.
Dive B, Burgarth D, Mintert F, 2016, Isotropy and control of dissipative quantum dynamics, PHYSICAL REVIEW A, Vol: 94, ISSN: 2469-9926
Verdeny A, Mintert F, 2015, Tunable Chern insulator with optimally shaken lattices, PHYSICAL REVIEW A, Vol: 92, ISSN: 1050-2947
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- Citations: 14
von Prillwitz K, Rudnicki L, Mintert F, 2015, Contrast in multipath interference and quantum coherence, PHYSICAL REVIEW A, Vol: 92, ISSN: 1050-2947
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- Citations: 20
Noebauer T, Angerer A, Bartels B, et al., 2015, Smooth optimal quantum control for robust solid-state spin magnetometry, Physical Review Letters, Vol: 115, ISSN: 0031-9007
We experimentally demonstrate a simple yet versatile optimal quantum control technique that achieves tailored robustness against qubit inhomogeneities and control errors while requiring minimal bandwidth. We apply the technique to nitrogen-vacancy (NV) centers in diamond and verify its performance using quantum process tomography. In a wide-field NV center magnetometry scenario, we achieve a homogeneous sensitivity across a 33% drop in control amplitude, and we improve the sensitivity by up to 2 orders of magnitude for a normalized detuning as large as 40%, achieving a value of 20 nT Hz−1/2 μm3/2 in sensitivity times square root volume.
Tranter A, Sofia S, Seeley J, et al., 2015, The Bravyi-Kitaev transformation: Properties and applications, INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Vol: 115, Pages: 1431-1441, ISSN: 0020-7608
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- Citations: 88
Cui J, Mintert F, 2015, Robust control of long-distance entanglement in disordered spin chains, New Journal of Physics, Vol: 17, ISSN: 1367-2630
We derive temporally shaped control pulses for the creation of long-distance entanglement in disordered spin chains. Our approach is based on a time-dependent target functional and a time-local control strategy that permits us to ensure that the description of the chain in terms of matrix product states is always valid. With this approach, we demonstrate that long-distance entanglement can be created even for substantially disordered interaction landscapes.
Dive B, Mintert F, Burgarth D, 2015, Quantum simulations of dissipative dynamics: Time dependence instead of size, PHYSICAL REVIEW A, Vol: 92, ISSN: 2469-9926
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- Citations: 11
Verdeny A, Mintert F, 2015, Structure-dynamics relation in shaken optical lattices, PHYSICAL REVIEW A, Vol: 92, ISSN: 1050-2947
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- Citations: 3
Mintert FM, Cui J, 2015, Long distance entanglement in disordered spin chains, New Journal of Physics, ISSN: 1367-2630
We derive temporally shaped control pulses for the creation of long-distance entanglement in disorderedspin chains. Our approach is based on a time-dependent target functional and a time-local control strategythat permits to ensure that the description of the chain in terms of matrix product states is always valid. Withthis approach, we demonstrate that long-distance entanglement can be created even for substantially disorderedinteraction landscapes.
Levi F, Mostarda S, Rao F, et al., 2015, Quantum mechanics of excitation transport in photosynthetic complexes: a key issues review, REPORTS ON PROGRESS IN PHYSICS, Vol: 78, ISSN: 0034-4885
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- Citations: 41
Haddadfarshi F, Cui J, Mintert F, 2015, Completely Positive Approximate Solutions of Driven Open Quantum Systems, PHYSICAL REVIEW LETTERS, Vol: 114, ISSN: 0031-9007
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- Citations: 17
Ra Y-S, Tichy MC, Lim H-T, et al., 2014, Comment on 'Non-monotonic projection probabilities as a function of distinguishability', NEW JOURNAL OF PHYSICS, Vol: 16, ISSN: 1367-2630
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- Citations: 4
Valido AA, Levi F, Mintert F, 2014, Hierarchies of multipartite entanglement for continuous-variable states, PHYSICAL REVIEW A, Vol: 90, ISSN: 1050-2947
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- Citations: 15
Verdeny A, Rudnicki L, Mueller CA, et al., 2014, Optimal Control of Effective Hamiltonians, PHYSICAL REVIEW LETTERS, Vol: 113, ISSN: 0031-9007
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- Citations: 12
Levi F, Mintert F, 2014, A quantitative theory of coherent delocalization, New Journal of Physics, Vol: 16, ISSN: 1367-2630
We define a quantitative measure of coherent delocalization; similarly to the concept of entanglement measures, we require that a measure of coherent delocalization may never increase under processes that do not create coherent superpositions. After a complete characterization of such processes, we prove that a set of recently introduced functions that characterize coherent delocalization never grow under such processes and thus are indeed valid measures.
Jacobsen SH, Mintert F, 2014, Optimal correction of independent and correlated errors, JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, Vol: 47, ISSN: 1751-8113
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- Citations: 2
Ra Y-S, Tichy MC, Lim H-T, et al., 2014, Non-monotonic quantum to classical transition in multiparticle interference, Conference on Advances in Photonics of Quantum Computing, Memory, and Communication VII, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Bartels B, Mintert F, 2013, Smooth optimal control with Floquet theory, PHYSICAL REVIEW A, Vol: 88, ISSN: 1050-2947
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- Citations: 21
Verdeny A, Mielke A, Mintert F, 2013, Accurate Effective Hamiltonians via Unitary Flow in Floquet Space, PHYSICAL REVIEW LETTERS, Vol: 111, ISSN: 0031-9007
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- Citations: 50
Witt B, Mintert F, 2013, Stationary quantum coherence and transport in disordered networks, NEW JOURNAL OF PHYSICS, Vol: 15, ISSN: 1367-2630
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- Citations: 27
Lucas F, Mintert F, Buchleitner A, 2013, Tailoring many-body entanglement through local control, PHYSICAL REVIEW A, Vol: 88, ISSN: 1050-2947
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- Citations: 13
Ra Y-S, Tichy MC, Lim H-T, et al., 2013, Observation of detection-dependent multi-photon coherence times, NATURE COMMUNICATIONS, Vol: 4, ISSN: 2041-1723
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- Citations: 30
Mostarda S, Levi F, Prada-Gracia D, et al., 2013, Structure-dynamics relationship in coherent transport through disordered systems, NATURE COMMUNICATIONS, Vol: 4, ISSN: 2041-1723
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- Citations: 19
Hisch T, Liertzer M, Pogany D, et al., 2013, Pump-Controlled Directional Light Emission from Random Lasers, PHYSICAL REVIEW LETTERS, Vol: 111, ISSN: 0031-9007
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- Citations: 91
Levi F, Mintert F, 2013, Hierarchies of Multipartite Entanglement, PHYSICAL REVIEW LETTERS, Vol: 110, ISSN: 0031-9007
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- Citations: 49
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