Quantum Theory of Many-Body Systems
Techniques and Applications
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11 Result(s)
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Alexandre M. Zagoskin
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Article
Open AccessRenninger’s Gedankenexperiment, the collapse of the wave function in a rigid quantum metamaterial and the reality of the quantum state vector
A popular interpretation of the “collapse” of the wave function is as being the result of a local interaction (“measurement”) of the quantum system with a macroscopic system (“detector”), with the ensuing loss...
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Quasi-superradiant soliton state of matter in quantum metamaterials
Strong interaction of a system of quantum emitters (e.g., two-level atoms) with electromagnetic field induces specific correlations in the system accompanied by a drastic increase of emitted radiation (superr...
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Open AccessQuantum metamaterials in the microwave and optical ranges
Quantum metamaterials generalize the concept of metamaterials (artificial optical media) to the case when their optical properties are determined by the interplay of quantum effects in the constituent ‘artific...
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Open AccessToroidal qubits: naturally-decoupled quiet artificial atoms
The requirements of quantum computations impose high demands on the level of qubit protection from perturbations; in particular, from those produced by the environment. Here we propose a superconducting flux q...
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Superconducting Quantum Metamaterials
Quantum metamaterials is a concept bridging the fields of conventional metamaterials and quantum processing in solid state. These are artificial media comprised of quantum coherent, specifically designed unit ...
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Book
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Chapter
Green’s Functions at Zero Temperature
When we discussed one-particle states in the second quantization representation, from the formally mathematical point of view any complete set of functions dependent on the coordinates (spin, etc.) of one particl...
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Methods of the Many-Body Theory in Superconductivity
The discovery of superconductivity by Kamerlingh Onnes in 1911 was a real challenge for contemporary physical theory. The theory of metals developed by Drude on the basis of classical statistical physics, whil...
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Basic Concepts
Technically speaking, physics deals only with one-body and many-body problems (because the two-body problem reduces to the one-body case, and the three-body problem does not, and is already insolvable). Still,...
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More Green’s Functions, Equilibrium and Otherwise, and Their Applications
The formalism we have developed so far is limited to zero temperature (i.e., to the ground state) properties of many-body systems. As you remember, this is because the ground state is always nondegenerate, so ...
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Article
Oxygen diffusion and dynamical disorder in high-T c superconductors: low frequency noise in superconducting tunnel junctions
The equilibrium diffusion fluctuations of oxygen concentration in HTSC are considered as a possible source of the low frequency current/voltage noise in tunnel junctions near the transition temperature in the ...
