Quantum computation and quantum information
Quantum computation and quantum information
Data Compression Limit for an Information Source of Interacting Qubits
Quantum Information Processing
Ground state entanglement in quantum spin chains
Quantum Information & Computation
Entanglement and separability of quantum harmonic oscillator systems at finite temperature
Quantum Information & Computation
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We investigate the role of entanglement in quantum phase transitions, and show that the success of the density matrix renormalization group (DMRG) in understanding such phase transitions is due to the way it preserves entanglement under renormalization. We provide a reinterpretation of the DMRG in terms of the language and tools of quantum information science which allows us to rederive the DMRG in a physically transparent way. Motivated by our reinterpretation we suggest a modification of the DMRG which manifestly takes account of the entanglement in a quantum system. This modified renormalization scheme is shown, in certain special cases, to preserve more entanglement in a quantum system than traditional numerical renormalization methods.PACS: 03.65.Ud, 73.43.Nq, 05.10.-a