Ferdinand Schmidt-Kaler
University of Mainz
Ion trapOpticsQuantum entanglementPhysicsIonQuantum informationTrapped ion quantum computerAtomic physicsMaterials scienceQubitCondensed matter physicsSpectroscopyLaserQuantum computerQuantum mechanicsQuantum opticsGround stateExcitationQuantumLaser cooling
302Publications
64H-index
11.5kCitations
Publications 265
Newest
#1Justas Andrijauskas (University of Mainz)H-Index: 1
#2Jonas Vogel (University of Mainz)H-Index: 2
Last. Ferdinand Schmidt-Kaler (University of Mainz)H-Index: 64
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#1D. PijnH-Index: 1
Last. Raam UzdinH-Index: 22
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Recently, the principle of \textit{passivity} has been used to set bounds on the evolution of a microscopic quantum system with a thermal initial state. In this work, we experimentally demonstrate the utility of two passivity based frameworks: global passivity and passivity deformation, for the detection of a "hidden" or unaccounted environment. We employ two trapped-ion qubits undergoing unitary evolution, which may optionally be coupled to an unobserved environment qubit. Evaluating the measur...
We demonstrate super-resolution optical sensing of the size of the wave packet of a single trapped ion. Our method is inspired by the well known ground state depletion (GSD) technique. Here, we use a hollow beam to strongly saturate a dipole-forbidden transition around a sub-diffraction limited area at its center and observe state dependent fluorescence. By spatially scanning this laser beam over a single trapped ^{40}\mathrm{Ca}^+ion, we are able to distinguish the wave packet sizes of ions ...
#1Wenbing LiH-Index: 1
#2Sebastian WolfH-Index: 7
Last. Ferdinand Schmidt-KalerH-Index: 64
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We implement three-dimensional polarization gradient cooling of trapped ions. Counter-propagating laser beams near 393\,m impinge in lin\,\perp\,in configuration, at a frequency below the S_{1/2}to P_{3/2}resonance in ^{40}a^+ We demonstrate mean phonon numbers of 5.4(4)at a trap frequency of 2\pi \times 285\,Hz and 3.3(4)at 2\pi\times480\,Hz, in the axial and radial directions, respectively. Our measurements demonstrate that cooling with laser beams detuned to lowe...
#1Felix Stopp (University of Mainz)H-Index: 5
#2Henri LehecH-Index: 1
Last. Ferdinand Schmidt-KalerH-Index: 64
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We present an alternative approach for interconnecting trapped ion processor nodes by a deterministic single ion transfer out of the trap, into a free space trajectory, followed by recapture in the trapping potential. Our experimental realization yields a success probability of 95.1%, namely 715 out of 752 extracted ions are retrapped, cooled and observed after a transport distance of 110mm and a time of flight of 7 \mu. Based on the near-unity operation success, we discuss its application fo...
#1Dmitry BudkerH-Index: 75
#2Peter W. GrahamH-Index: 49
Last. Stefan UlmerH-Index: 24
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We propose the use of trapped ions for detection of millicharged dark matter. Millicharged particles will scatter off the ions, giving a signal either in individual events or in the overall heating rate of the ions. Ion traps have several properties which make them ideal detectors for such a signal. First, ion traps have demonstrated significant isolation of the ions from the environment, greatly reducing the background heating and event rates. Second, ion traps can have low thresholds for detec...
#1Janine HilderH-Index: 1
#2D. PijnH-Index: 1
Last. Ulrich PoschingerH-Index: 26
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Quantum error correction requires the detection of errors by reliable measurements of suitable multi-qubit correlation operators. Here, we experimentally demonstrate a fault-tolerant weight-4 parity check measurement scheme. An additional 'flag' qubit serves to detect errors occurring throughout the parity measurement, which would otherwise proliferate into uncorrectable weight-2 errors on the qubit register. We achieve a flag-conditioned parity measurement single-shot fidelity of 93.2(2)\%. Del...
Abstract The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. We describe the simulation, design, construction and s...
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A single ^{40}a ion is confine in the harmonic potential of a Paul trap and cooled to a temperature of a few mK, with a wave packet of sub-m spatial and sub-m/s velocity uncertainty. Deterministically extracted from the Paul trap, the single ion is propagating over a distance of 0.27 m and detected. By engineering the ion extraction process on the initial wave packet, theoretically modeling the ion trajectories, and studying experimentally the time-of-flight distribution, we directly infer th...
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#2Georg JacobH-Index: 4
Last. Ferdinand Schmidt-KalerH-Index: 64
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