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Home › 10. QUANTUM COMPUTATION › 15. IMPLEMENTATIONS: QUANTUM OPTICS

15.20.Lp Linear Paul traps

Formation of helical ion chains

Fri, 2016-06-03 13:11 - Oliver Marty
Date: 
2015-10-20 - 2016-01-25
Author(s): 

R. Nigmatullin, A. del Campo, G. De Chiara, G. Morigi, M. B. Plenio, and A. Retzker

Reference: 

Phys. Rev. B 93, 014106

URL: 

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.014106

We study the nonequilibrium dynamics of the linear-to-zigzag structural phase transition exhibited by an ion chain confined in a trap with periodic boundary conditions. The transition is driven by reducing the transverse confinement at a finite quench rate, which can be accurately controlled. This results in the formation of zigzag domains oriented along different transverse planes. The twists between different domains can be stabilized by the topology of the trap, and under laser cooling the system has a chance to relax to a helical chain with nonzero winding number.

  • 12.10.+i Simulations of many-body interactions
  • Result
  • SIQS
  • 15.20.Lp Linear Paul traps
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Structural phase transitions and topological defects in ion Coulomb crystals

Fri, 2016-06-03 12:35 - Oliver Marty
Date: 
2015-03-01 - 2015-12-01
Author(s): 

Heather L. Partner, Ramil Nigmatullin, Tobias Burgermeister, Jonas Keller, Karsten Pyka, Martin B. Plenio, Alex Retzker, Wojciech H. Zurek, Adolfo del Campo, Tanja E. Mehlstäubler

Reference: 

Physica B: Condensed Matter, Volume 460, Pages 114–118

URL: 

http://www.sciencedirect.com/science/article/pii/S0921452614008850

We use laser-cooled ion Coulomb crystals in the well-controlled environment of a harmonic radiofrequency ion trap to investigate phase transitions and defect formation. Topological defects in ion Coulomb crystals (kinks) have been recently proposed for studies of nonlinear physics with solitons and as carriers of quantum information. Defects form when a symmetry breaking phase transition is crossed nonadiabatically. For a second order phase transition, the Kibble–Zurek mechanism predicts that the formation of these defects follows a power law scaling in the rate of the transition.

  • Result
  • SIQS
  • 15.20.Lp Linear Paul traps
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Controlling the transport of an ion: classical and quantum mechanical solutions

Fri, 2016-03-04 09:11 - Werner Weiss
Date: 
2014-07-09
Author(s): 

H. A. Fürst, M. H. Goerz, U. G. Poschinger, M. Murphy, S. Montangero, T. Calarco, F. Schmidt-Kaler, K. Singer, C. P. Koch

Reference: 

New J. Phys. 16, 075007 (2014)
http://dx.doi.org/10.1088/1367-2630/16/7/075007

URL: 

http://iopscience.iop.org/article/10.1088/1367-2630/16/7/075007

  • H2020
  • QIPC
  • PICC
  • 15.10.Ie Ions: electronic states
  • Result
  • SIQS
  • 15.10.Iv Ions: vibrational states
  • 05.70.+o Quantum information & quantum control
  • Other
  • 15.20.Lp Linear Paul traps
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From classical to quantum criticality

Fri, 2016-03-04 09:00 - Werner Weiss
Date: 
2014-06-11
Author(s): 

D. Podolsky, E. Shimshoni, P. Silvi, S. Montangero, T. Calarco, G. Morigi, S. Fishman

Reference: 

Phys. Rev. B 89, 214408 (2014)
http://dx.doi.org/10.1103/PhysRevB.89.214408

URL: 

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.214408

We study the crossover from classical to quantum phase transitions at zero temperature within the framework of

  • 02.10.+t Quantum-Classical Transition
  • 12.10.+i Simulations of many-body interactions
  • H2020
  • QIPC
  • Result
  • SIQS
  • 15.20.Lp Linear Paul traps
  • Read more

Phonon-to-spin mapping in a system of a trapped ion via optimal control

Thu, 2016-03-03 15:05 - Werner Weiss
Date: 
2015-11-23
Author(s): 

M. M. Müller, U.G. Poschinger, T. Calarco, S. Montangero, F. Schmidt-Kaler

Reference: 

Phys. Rev. A 92, 053423 (2015)
http://dx.doi.org/10.1103/PhysRevA.92.053423

URL: 

http://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.053423

We propose a protocol for measurement of the phonon number distribution of a harmonic oscillator based on selective mapping to a discrete spin-1/2 degree of freedom. We consider a system of a harmonically trapped ion, where a transition between two long-lived states can be driven with resolved motional sidebands. The required unitary transforms are generated by amplitude-modulated polychromatic radiation fields, where the time-domain ramps are obtained from numerical optimization by application of the chopped random basis algorithm (CRAB).

  • 01.10.+i Encoding, processing and transmission of information via physical systems
  • H2020
  • QIPC
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • Result
  • SIQS
  • 15.10.Iv Ions: vibrational states
  • 15.20.Lp Linear Paul traps
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Observation of entanglement propagation in a quantum many-body system

Wed, 2014-01-22 13:04 - Christian Roos
Date: 
2014-01-21 - 2014-01-22
Author(s): 

P. Jurcevic, B. P. Lanyon, P. Hauke, C. Hempel, P. Zoller, R. Blatt, C. F. Roos

Reference: 

ArXiv:1401:5387

URL: 

http://arxiv.org/abs/1401.5387

The key to explaining a wide range of quantum phenomena is understanding how entanglement propagates around many-body systems. Furthermore, the controlled distribution of entanglement is of fundamental importance for quantum communication and computation. In many situations, quasiparticles are the carriers of information around a quantum system and are expected to distribute entanglement in a fashion determined by the system interactions.

  • QIPC
  • 15.10.Ie Ions: electronic states
  • SIQS
  • 04.80.+d Entanglement dynamics in composite quantum systems
  • 15.20.Lp Linear Paul traps
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Frustrated Quantum Spin Models with Cold Coulomb Crystals

Tue, 2013-04-09 09:49 - Mattia Giardini
Date: 
2011-11-11
Author(s): 

A. Bermudez, J. Almeida, F. Schmidt-Kaler, A. Retzker, M. B. Plenio

Reference: 

URL: http://link.aps.org/doi/10.1103/PhysRevLett.107.207209
DOI: 10.1103/PhysRevLett.107.207209
PACS: 75.10.Jm, 03.67.Ac, 05.30.Rt, 37.10.Ty

We exploit the geometry of a zigzag cold-ion crystal in a linear trap to propose the quantum simulation of a paradigmatic model of long-ranged magnetic frustration. Such a quantum simulation would clarify the complex features of a rich phase diagram that presents ferromagnetic, dimerized-antiferromagnetic, paramagnetic, and floating phases, together with previously unnoticed features that are hard to assess by numerics.

  • AQUTE
  • Quantum Metrology, Sensing and Imaging
  • Result
  • 15.10.Iv Ions: vibrational states
  • 15.20.Lp Linear Paul traps
  • Read more

Precision measurements in ion traps using slowly moving standing waves

Tue, 2013-04-09 08:51 - Mattia Giardini
Date: 
2011-10-11
Author(s): 

Walther, A.; Poschinger, U.; Singer, K.; Schmidt-Kaler, F.

Reference: 

Origin: SPRINGER

DOI: 10.1007/s00340-011-4740-8
Bibliographic Code: 2012ApPhB.107.1061W

URL: 

http://link.springer.com/article/10.1007%2Fs00340-011-4740-8

The present paper describes the experimental implementation of a measuring technique employing a slowly moving, near-resonant, optical standing wave in the context of trapped ions. It is used to measure several figures of merit that are important for quantum computation in ion traps and which are otherwise not easily obtainable.

  • 41.10.+p Quantum enhanced measurements
  • AQUTE
  • Quantum Computation
  • Result
  • 15.20.Lp Linear Paul traps
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Rydberg excitation of trapped cold ions: a detailed case study

Thu, 2011-09-29 15:11 - Donatella Rosetti
Date: 
2011-07-29
Author(s): 

F. Schmidt-Kaler, T. Feldker, D. Kolbe, J. Walz, M. Müller, P. Zoller, W. Li, I. Lesanovsky

Reference: 

New Journal of Physics 13, 075014 (2011)
doi:10.1088/1367-2630/13/7/075014

We present a detailed theoretical and conceptual study of a planned experiment to excite Rydberg states of ions trapped in a Paul trap. The ultimate goal is to exploit the strong state-dependent interactions between Rydberg ions to implement quantum information processing protocols and simulate the dynamics of strongly interacting spin systems. We highlight the promise of this approach when combining the high degree of control and readout of quantum states in trapped ion crystals with the novel and fast gate schemes based on interacting giant Rydberg atomic dipole moments.

  • 15.10.–p Quantum Optics: Physical qubits
  • AQUTE
  • Quantum Computation
  • 15.10.Ie Ions: electronic states
  • 15.20.Lp Linear Paul traps
  • Read more

Frustrated Quantum Spin Models with Cold Coulomb Crystals

Thu, 2011-09-29 15:00 - Donatella Rosetti
Date: 
2011-08-04
Author(s): 

A. Bermudez, J. Almeida, F. Schmidt-Kaler, A. Retzker, M. B. Plenio

Reference: 

arXiv:1108.1024 (2011)

We exploit the geometry of a zig-zag cold-ion crystal in a linear trap to propose the quantum simulation of a paradigmatic model of long-ranged magnetic frustration. Such a quantum simulation would clarify the complex features of a rich phase diagram that presents ferromagnetic, dimerized antiferromagnetic, paramagnetic, and floating phases, together with previously unnoticed features that are hard to assess by numerics. We analyze in detail its experimental feasibility, and provide supporting numerical evidence on the basis of realistic parameters in current ion-trap technology.

  • AQUTE
  • Quantum Metrology, Sensing and Imaging
  • 15.10.Iv Ions: vibrational states
  • 15.20.Lp Linear Paul traps
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