Ground state entanglement energetics
نویسندگان
چکیده
منابع مشابه
Ground-state entanglement of the BCS model.
The concept of local concurrence is used to quantify the entanglement between a single qubit and the remainder of a multiqubit system. For the ground state of the BCS model in the thermodynamic limit the set of local concurrences completely describes the entanglement. As a measure for the entanglement of the full system we investigate the average local concurrence (ALC). We find that the ALC sa...
متن کاملEntanglement energetics at zero temperature.
We show how many-body ground state entanglement information may be extracted from subsystem energy measurements at zero temperature. Generically, the larger the measured energy fluctuations are, the larger the entanglement is. Examples are given with the two-state system and the harmonic oscillator. Comparisons made with recent qubit experiments show that this type of measurement provides anoth...
متن کاملGround state entanglement and geometric entropy in the Kitaev model
We study the entanglement properties of the ground state in Kitaev’s model. This is a two-dimensional spin system with a torus topology and non-trivial four-body interactions between its spins. For a generic partition (A,B) of the lattice we calculate analytically the von Neumann entropy of the reduced density matrix ρA in the ground state. We prove that the geometric entropy associated with a ...
متن کاملGround State Entanglement in One Dimensional Translationally Invariant Quantum Systems
We examine whether it is possible for one-dimensional translationally-invariant Hamiltonians to have ground states with a high degree of entanglement. We present a family of translationally invariant Hamiltonians {Hn} for the infinite chain. The spectral gap of Hn is Ω(1/poly(n)). Moreover, for any state in the ground space of Hn and anym, there are regions of sizem with entanglement entropy Ω(...
متن کاملGround-State Entanglement Gives Birth to Quantum Energy Teleportation
Ground-state entanglement induces emergence of negativeenergy-density regions in quantum systems by squeezing zero-point oscillation, keeping total energy of the systems nonnegative. By use of the negativity of quantum energy density, protocols of quantum energy teleportation are proposed that transport energy to distant sites by local operations and classical communication. The energy is telep...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physica E: Low-dimensional Systems and Nanostructures
سال: 2005
ISSN: 1386-9477
DOI: 10.1016/j.physe.2005.05.024