Ground State Entanglement in Spin Systems
نویسندگان
چکیده
منابع مشابه
Quantum Energy Teleportation by use of Ground State Entanglement of Spin Chain Systems
Entanglement opens the door to a lot of attractive quantum tasks including quantum teleportation, which teleports any unknown quantum state to distant places only by local operations and classical communication (LOCC). In this Letter, I propose a quantum energy teleportation protocol for spin chain systems, which transports energy to distant sites only by LOCC. In principle, the dissipation rat...
متن کاملQuantum Energy Teleportation by Ground State Entanglement of Spin Chain Systems
We propose a quantum energy teleportation protocol for spin chain systems which transports energy to distant sites only by local operations and classical communication. The protocol utilizes ground state entanglement among spins. A notable property of the protocol is that the dissipation rate of energy in transport is strongly suppressed because energy is not transmitted, but instead classical ...
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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(...
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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...
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We consider quantum spin systems defined on finite sets V equipped with a metric. In typical examples, V is a large, but finite subset of Z. For finite range Hamiltonians with uniformly bounded interaction terms and a unique, gapped ground state, we demonstrate a locality property of the corresponding ground state projector. In such systems, this ground state projector can be approximated by th...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics Supplement
سال: 2005
ISSN: 0375-9687
DOI: 10.1143/ptps.157.164