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**单位：**University of Copenhagen

研究方向：Solid-State Qubits，Nanowires and Nanotubes，Topological Quantum Systems，Novel Devices

**Research at QDev**

The Center for Quantum Devices (QDev, for short) studies how to create, control, measure, and protect quantum coherence and entanglement in solid-state electronic devices.

The miniaturization and scaling of modern electronics, yielding billions of transistors on a chip, has a quantum analog in which quantum states of transistors are made to interact, and hence become entangled, with the specificity of a computer algorithm.

The general power of such a device to communicate, compute, measure, and simulate physical and chemical systems is unknown. From known examples where entanglement serves as a resource, one can expect rich and surprising phenomena to emerge from such a device, reflecting the large space of quantum states compared to the number of classical states.

Once entanglement is brought under control and becomes a resource, the technological harvest has the potential to revolutionize communication, information processing, and simulation of quantum mechanical systems from novel superconducting materials to biomolecules.

**Solid-State Qubits**

Interpreting controlled quantum systems as qubits connects problems of quantum coherence and entanglement to a set of fundamental questions connecting quantum mechanics and information science. In this context, sequences of operations that entangle pairs of quantum states constitute algorithms operating on information encoded into the quantum state of the system.

**Nanowires and Nanotubes**

QDev has a particular interest in materials where the spin environment or spin-orbit coupling can be controlled. Several options exist within nanotubes and nanowires that in addition exhibit one-dimensional transport and allows for integration in hybrid devices. Quantum dots and qubits can readily be made with these materials. The center houses facilities for growth of carbon nanotubes and semiconductor nanowires.

**Topological Quantum Systems**

Recent insights into the role of topology in condensed matter systems has led to remarkable predictions of new classes of materials and excitations in solids, most of which remain unverified by experiment. An interactive theory/experiment/materials program to create, identify, and control non-abelian particles in condensed matter will be a major focus of the Center.

**Novel Devices**

The nanoscale materials and experimental techniques used in quantum devices are useful also for other areas in physics and nanotechnology. QDev research leads to new types of devices and fabrication schemes.