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Nuclear spin dynamics in double quantum dots: Fixed points, transients, and intermittency

Mon, 2013-02-11 16:04 - Daniel Rudolph
Date: 
2013-02-11
Author(s): 

M. S. Rudner, F. H. L. Koppens, J. A. Folk, L. M. K. Vandersypen, and L. S. Levitov

Reference: 

Phys. Rev. B 84, 075339 (2011)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.84.075339

Resolving Spin-Orbit and Hyperfine Mediated Electric Dipole Spin Resonance in a Quantum Dot

Mon, 2013-02-11 15:55 - Daniel Rudolph
Date: 
2012-07-13
Author(s): 

M. Shafiei, K. C. Nowack, C. Reichl, W. Wegscheider, L. M. K. Vandersypen

Reference: 

arXiv:1207.3331 [quant-ph]

URL: 

http://arxiv.org/abs/1207.3331

We investigate the electric manipulation of a single electron spin in a single gate-defined quantum dot. We observe that so-far neglected shifts between the hyperfine and spin-orbit mediated electric dipole spin resonance conditions have important consequences at high magnetic fields. In experiments using adiabatic rapid passage to robustly invert the electron spin, the resonance shifts lead to an unusually wide and asymmetric response as a function of magnetic field. Simulations support the interpretation of the lineshape in terms of four different resonance conditions.

Experimental Monte Carlo Quantum Process Certification

Mon, 2013-02-11 11:15 - Daniel Rudolph
Date: 
2012-06-28
Author(s): 

L. Steffen, M. P. da Silva, A. Fedorov, M. Baur, and A. Wallraff

Reference: 

Phys. Rev. Lett. 108, 260506 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.108.260506

Quantum-control approach to realizing a Toffoli gate in circuit QED

Mon, 2013-02-11 11:13 - Daniel Rudolph
Date: 
2012-02-13
Author(s): 

V. M. Stojanović, A. Fedorov, A. Wallraff, and C. Bruder

Reference: 

Phys. Rev. B 85, 054504 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.85.054504

Quantum dot admittance probed at microwave frequencies with an on-chip resonator

Mon, 2013-02-11 11:11 - Daniel Rudolph
Date: 
2012-09-04
Author(s): 

T. Frey, P. J. Leek, M. Beck, J. Faist, A. Wallraff, K. Ensslin, T. Ihn, and M. Büttiker

Reference: 

Phys. Rev. B 86, 115303 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.86.115303

Demonstrating W-type entanglement of Dicke states in resonant cavity quantum electrodynamics

Mon, 2013-02-11 11:08 - Daniel Rudolph
Date: 
2012-11-30
Author(s): 

J. A. Mlynek, A. A. Abdumalikov, Jr., J. M. Fink, L. Steffen, M. Baur, C. Lang, A. F. van Loo, and A. Wallraff

Reference: 

Phys. Rev. A 86, 053838 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevA.86.053838

Quantum Heating of a Nonlinear Resonator Probed by a Superconducting Qubit

Mon, 2013-02-11 11:06 - Daniel Rudolph
Date: 
2013-01-22
Author(s): 

F. R. Ong, M. Boissonneault, F. Mallet, A. C. Doherty, A. Blais, D. Vion, D. Esteve, and P. Bertet

Reference: 

Phys. Rev. Lett. 110, 047001 (2013)

URL: 

http://link.aps.org/doi/10.1103/PhysRevLett.110.047001

We measure the quantum fluctuations of a pumped nonlinear resonator using a superconducting artificial atom as an in situ probe. The qubit excitation spectrum gives access to the frequency and amount of excitation of the intracavity field fluctuations, from which we infer its effective temperature. These quantities are found to be in agreement with theoretical predictions; in particular, we experimentally observe the phenomenon of quantum heating.

 

Electron spin resonance detected by a superconducting qubit

Mon, 2013-02-11 11:04 - Daniel Rudolph
Date: 
2012-08-10
Author(s): 

Y. Kubo, I. Diniz, C. Grezes, T. Umeda, J. Isoya, H. Sumiya, T. Yamamoto, H. Abe, S. Onoda, T. Ohshima, V. Jacques, A. Dréau, J.-F. Roch, A. Auffeves, D. Vion, D. Esteve, and P. Bertet

Reference: 

Phys. Rev. B 86, 064514 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.86.064514

Circuit quantum electrodynamics with a nonlinear resonator

Mon, 2013-02-11 11:02 - Daniel Rudolph
Date: 
2012-09-01
Author(s): 

P. Bertet, F. R. Ong, M. Boissonneault, A. Bolduc, F. Mallet, A. C. Doherty, A. Blais, D. Vion, D. Esteve

Reference: 

Book chapter in "Fluctuating Nonlinear Oscillators" by Oxford University Press, edited by Mark Dykman (published in 2012)

URL: 

http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199691388.0...

Quantum speeding-up of computation demonstrated in a superconducting two-qubit processor

Mon, 2013-02-11 10:33 - Daniel Rudolph
Date: 
2012-04-05
Author(s): 

A. Dewes, R. Lauro, F. R. Ong, V. Schmitt, P. Milman, P. Bertet, D. Vion, and D. Esteve

Reference: 

Phys. Rev. B 85, 140503(R) (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.85.140503

We operate a superconducting quantum processor consisting of two tunable transmon qubits coupled by a swapping interaction, and equipped with nondestructive single-shot readout of the two qubits. With this processor, we run the Grover search algorithm among four objects and find that the correct answer is retrieved after a single run with a success probability between 0.52 and 0.67, which is significantly larger than the 0.25 achieved with a classical algorithm. This constitutes a proof of concept for the quantum speed-up of electrical quantum processors.

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