Understanding sites like moviesjoy reddit requires examining multiple perspectives and considerations. SiteTypes Included with ITensor · ITensorMPS.jl. Site indices with the "Fermion" SiteType represent spinless fermion sites with the states $|0\rangle$, $|1\rangle$, corresponding to zero fermions or one fermion. SiteSet Class for specifying the local Hilbert space of each site of a lattice by storing the associated site index.
A SiteSet does not store any information about the topology of the lattice, just the number of sites and information about each site. ITensor comes with specialized subclasses of SiteSet, such as the SpinHalf and SpinOne classes, which provide facilities to create sites of a ... SiteType and op, state, val functions · ITensorMPS.jl. Documentation for ITensorMPS.jl.state(s::Index, name::String; kwargs...) Return an ITensor corresponding to the state named name for the Index s.
The returned ITensor will have s as its only index. The terminology here is based on the idea of a single-site state or wavefunction in physics. The state function is implemented for various Index tags by overloading either the state or state ... From another angle, physics (SiteType) System Examples · ITensorMPS.jl. The function state is used to define states (single-site wavefunctions) that sites can be in.
For example, the "Qubit" site type includes definitions for the "0" and "1" states as well as the "+" (eigenstate of X operator) state. Home · ITensorMPS.jl. psi0 = random_mps(sites) # Plan to do 5 passes or 'sweeps' of DMRG, # setting maximum MPS internal dimensions # for each sweep and maximum truncation cutoff # used when adapting internal dimensions: nsweeps = 5 maxdim = [10, 20, 100, 100, 200] cutoff = 1.0e-10 # Run the DMRG algorithm, returning energy # (dominant eigenvalue) and optimized MPS SiteType and op · ITensors.jl. op(opname::String, s::Index; kwargs...) Return an ITensor corresponding to the operator named opname for the Index s.
The operator is constructed by calling an overload of either the op or op! methods which take a SiteType argument that corresponds to one of the tags of the Index s and an OpName"opname" argument that corresponds to the input operator name. Operator names can be combined using ... From another angle, dMRG Examples · ITensorMPS.jl. Additionally, n = 100 sites = siteinds("S=1",N) Here we have chosen to create a Hilbert space of N spin 1 sites.
The string "S=1" denotes a special Index tag which hooks into a system that knows "S=1" indices have a dimension of 3 and how to create common physics operators like "Sz" for them. Next we'll make our Hamiltonian matrix product operator (MPO). Intelligent Indices The indices of an ITensor have unique identities.
Another key aspect involves, when contracting two ITensors, matching indices "find" each other and contract automatically. Adding two ITensors is literally as easy as A+B. Another key aspect involves, groups of ITensors can be arranged into networks which know their topology. Furthermore, boson and BosonSite - ITensor. Boson and BosonSite The Boson class is a specialization of SiteSet which initializes its sites to be of type BosonSite, representing a spinless particle with maximum site occupancy that can be set by the user.
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