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Superconducting qubits shine out among other qubit implementations with respect to their excellent scalability

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.

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The amplification of a microwave signal by a strongly driven solid-state two-level quantum system

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Coherent Frequency Conversion in a Superconducting Artificial Atom with Two Internal Degrees of Freedom

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Dipole Coupling of a Double Quantum Dot to a Microwave Resonator

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.

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Implementation of a Toffoli gate with superconducting circuits

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.

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