The qubits of a quantum computer can be coded within the ladder of states of a quantum manifold or continuous variable, such as the momentum of a single cold atom [1] or the vibrational state of a trapped ion [2]. While the scaling of such systems limits their potential for quantum information processing (QIP), they are intriguing because they allow an algorithmic approach to the coherent contr...

We demonstrate a multipartite protocol to securely distribute and reconstruct a quantum state. A secret quantum state is encoded into a tripartite entangled state and distributed to three players. By collaborating, any two of the three players can reconstruct the state, while individual players obtain nothing. We characterize this (2,3) threshold quantum state sharing scheme in terms of fidelit...

Using an approach based on the synergy between techniques of quantum information and many-body physics, a study circuits indicates that quality being classically simulated can coexist with having high complexity.

The quantum-to-classical transition is due to environment-induced decoherence, and it depicts how classical dynamics emerges from quantum systems. Previously, the quantum-to-classical transition has mainly been described with memory-less (Markovian) quantum processes. Here we study the complexity of the quantum-to-classical transition through general non-Markovian memory processes. That is, the...

Quantum discord quantifies quantum correlation between quantum systems, which has potential application in quantum information processing. In this paper, we propose a scheme realizing the remote transfer of Gaussian quantum discord, in which another quantum discordant state or an Einstein-Podolsky-Rosen entangled state serves as ancillary state. The calculation shows that two independent optica...