QUIE2T Quantum Information Entanglement-Enabled Technologies

 - Quantum key distribution with continuous variables: theoretical and experimental work on long-distance system performance and side channel induced attacks

- Quantum cryptographic primitives: theoretical and experimental work on secret sharing, coin flipping, entanglement verification in the presence of adversaries

- Theory of Quantum Computation and Quantum Information including measurement-based quantum computing, entanglement theory and foundations of physics

On the 4th of February 2011 the European Commission has sent us the official approval to our request to add Basel Universität (UNIBAS) among the AQUTE partners, following the move of Professor Philipp Treutlein from München (LMU, AQUTE partner P11) to Basel.

The Q-ESSENCE project meeting will take place during the QIPC 2011 conference in Zurich. The exact time is 16:30-18:50 on the Friday 9th September 2011. A joint dinner will follow afterwards.

In this work, the authors show how random numbers can be generated in a certified manner using the non-local correlation of entangled quantum states. The randomness of the generated symbols is private and device-independent. Moreover, they perform an experimental proof-of-principle realization of the theoretical formalism.

Device-Independent Quantum Key Distribution protocols aim at establishing a secret key between two honest parties whose security is independent of the details of the devices used in the protocol. In this work, the authors propose an implementation of this idea using a noiseless photon amplifier. The proposal suggest that positive secret-key rates may be obtained using near-future technology.

The authors establish methods for quantum state tomography based on compressed sensing. These methods are specialized for quantum states that are fairly pure, and they offer a significant performance improvement on large quantum systems: they require only simple Pauli measurements, use fast convex optimization, are stable against noise, and can be applied to states that are only approximately low rank.

Matrix product states (MPS) represent a powerful ansatz for the computation of ground state properties of local Hamiltonians. In this work, the authors define MPS in the continuum limit, without any reference to an underlying lattice parameter. This allows extending the density matrix renormalization group and variational matrix product state formalism to quantum field theories and continuum models in 1 spatial dimension.

The authors propose a novel approach to prepare mesoscopic mechanical systems in superposition, or entangled states at room temperatures. A promising setup for the implementation of these ideas consists of levitated nanospheres coupled to high-finesse cavities.

The authors propose a novel approach to prepare mesoscopic mechanical systems in superposition, or entangled states at room temperatures. A promising setup for the implementation of these ideas consists of levitated nanospheres coupled to high-finesse cavities.

Complex networks represent one of the most active research topics, as they found application in many different scenarios, from studied of internet to propagation of diseases. In this work, the authors extend the concept of a random network, arguably the simplest example of complex network, to the quantum domain. They show that the obtained model has a completely distinct behavior of the critical probabilities at which different subgraphs appear.