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Format: 2020-06-06
Format: 2020-06-06
Format: 2020-06-06

29th Sep 2011

We study the ability to control d-dimensional quantum systems (qudits) encoded in the hyperfine spin of alkali-metal atoms through the application of radio- and microwave-frequency magnetic fields in the presence of inhomogeneities in amplitude and detuning. Such a capability is essential to the design of robust pulses that mitigate the effects of experimental uncertainty and also for application to tomographic addressing of particular members of an extended ensemble. We study the problem of preparing an arbitrary state in the Hilbert space from an initial fiducial state.

28th Sep 2011

We have realized a hybrid optomechanical system by coupling ultracold atoms to a micromechanical membrane. The atoms are trapped in an optical lattice, which is formed by retro-reflection of a laser beam from the membrane surface. In this setup, the lattice laser light mediates an optomechanical coupling between membrane vibrations and atomic center-of-mass motion. We observe both the effect of the membrane vibrations onto the atoms as well as the backaction of the atomic motion onto the membrane.

28th Sep 2011

We measure the frequency dependence of the mechanical quality factor (Q) of SiN membrane oscillators and observe a resonant variation of Q by more than two orders of magnitude. The frequency of the fundamental mechanical mode is tuned reversibly by up to 40% through local heating with a laser. Several distinct resonances in Q are observed that can be explained by coupling to membrane frame modes. Away from the resonances, the background Q is independent of frequency and temperature in the measured range.

14th Sep 2011

After the successful Industry Sessions held at the previous QIPC meetings in Barcelona’07 and Rome’09, the event at QIPC'11 again offered a platform for exchanges between academic researchers and industry leaders.

There were presentations by Dr. Bruno Michel, from IBM Research, Zürich, who talked about 'Computing after scaling: New computation paradigms', and Dr. Grégoire Ribordy, CEO of ID Quantique, who are celebrating their 10th anniversary this year. The title of his presentation was accordingly 'Commercializing QITechnology for 10 years'.

13th Sep 2011

A dedicated channel on youtube to collect popular video clips on key scientific ideas explored within QIPC. This is sponsored by projects funded by FP6 and FP7 programs of the European Commission.

Visit TheQubitLab.

12th Sep 2011

The QUIE2T-sponsored international conference on Quantum Information Processing and Communication (QIPC 2011) was held at ETH Zurich from September 5 - 9, 2011.

6th Sep 2011

We introduce a protocol to drive many body quantum systems into long-lived entangled states, protected from decoherence by big energy gaps. With this approach it is possible to implement scalable entanglement-storage units. We test the protocol in the Lipkin-Meshkov-Glick model, a prototype many-body quantum system that describes different experimental setups.

1st Aug 2011

We are happy to announce that, by decision of the QUIE2T Advisory Board of Experts and upon approval by the QUIE2T Coordination Steering committee, the

2011 European Quantum Information Young Investigator Award

has been awarded jointly to

26th Jul 2011

We investigate the out-of-equilibrium dynamics of the one-dimensional quantum Ising model after a sudden quench in the transverse magnetic field. While for a translationally invariant system the statistical description of the asymptotic order parameter correlations after the quench can be performed in terms of the generalized Gibbs ensemble, we show that a breaking of translational invariance, e.g. by perturbing the boundary conditions, disrupts its validity.

25th Jul 2011

Considerable efforts are currently devoted to the preparation of ultracold neutral atoms in the strongly correlated quantum Hall regime. However, the necessary angular momentum is very large and in experiments with rotating traps this means spinning frequencies extremely near to the deconfinement limit; consequently, the required control on parameters turns out to be too stringent. Here we propose instead to follow a dynamic path starting from the gas initially confined in a rotating ring.

30th Jun 2011

wp-2.2: Quantum light sources

30th Jun 2011

wp-1.3: Metrology at the quantum-quantum interface

30th Jun 2011

wp-2.5: Quantum communication test beds

30th Jun 2011

wp-2.4: Design and comparison of quantum communication technologies

30th Jun 2011

wp-2.4: Design and comparison of quantum communication technologies

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