Highlights for SOLID

Results tagged as highlights of the project.

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Format: 2019-08-25
Format: 2019-08-25
Format: 2019-08-25


Mar 22, 2012

Superconducting qubits shine out among other qubit implementations with respect to their excellent scalability. In collaboration with the group of E. Ilichev at IPHT in Jena, the Karlsruhe experimental group of A. Ustinov has performed experiments on a chip containing 7 flux qubits. A newly developed measurement scheme based on frequency multiplexing allowed the researchers to read out all qubits simultaneously, using only a single signal cable.


Mar 21, 2012

We have realized a novel device in which a semiconductor double quantum dot is dipole coupled to a GHz-frequency high-quality transmission line resonator. This approach allows us to characterize the properties of the double dot by measuring both its dispersive and dissipative interaction with the resonator. In addition to providing a new readout mechanism, this architecture has the potential to isolate the dots from the environment and to provide long distance coupling between spatially separated dots.


Mar 21, 2012

The Toffoli gate is a three-qubit operation that inverts the state of a target qubit conditioned on the state of two control qubits. It enables universal reversible classical computation, forms a universal set of gates in quantum computation together with a Hadamard gate and is also a key element in quantum error correction schemes. Here, Andreas Wallraff and colleagues at ETH-Zurich demonstrated the implementation of a Toffoli gate with three superconducting transmon qubits coupled to a microwave resonator.


Mar 21, 2012

Teleportation of a quantum state may be used for distributing entanglement between distant qubits in quantum communication and for quantum computation. In this publication, the group of Andreas Wallraff at ETH Zurich demonstrated the implementation of a teleportation protocol, up to the single-shot measurement step, with superconducting qubits coupled to a microwave resonator. Using full quantum state tomography and evaluating an entanglement witness, they show that the protocol generates a genuine tripartite entangled state of all three qubits.


Mar 21, 2012

A team of scientists of the Kavli Institute of Nanoscience of TU Delft and the FOM Foundation has succeeded in very accurately initializing and reading out a mini-quantum computer comprising four quantum bits on a chip of diamond. This breakthrough marks an important step towards a quantum computer and makes it possible to test advanced quantum protocols, such as teleportation, on a chip. The researchers have published their results in Nature 477, 574 (2011).   http://www.nature.com/nature/journal/v477/n7366/full/nature10401.html


Mar 21, 2012

We have embedded an artificial atom, a superconducting "transmon" qubit, in an open transmission line and investigated the strong scattering of incident microwave photons (~GHz). When an input coherent state, with an average photon number N<<1 is on resonance with the artificial atom, we observe extinction of up to 90% in the forward propagating field. We use two-tone spectroscopy to study scattering from excited states and we observe electromagnetically induced transparency (EIT).


Mar 21, 2012

CEA has operated a two-qubit processor fitted with high fidelity single-shot readout and able to demonstrate quantum speed-up [1-2]. With this processor, CEA performed: The process tomography of a high fidelity universal gate Sqrt (ISwap); The demonstration of quantum speed-up for the Grover search algorithm for the first time in an electrical processor.


Mar 20, 2012

Although the quantum Rabi model is the simplest model describing the coupling of quantum light and matter, only now has an analytical solution been found.    http://physics.aps.org/articles/v4/68

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