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Creating specific States

Sources create_state.hpp, create_state.cpp

product_state

Creates a filled product state.

State product_state(Block const &block, std::vector<std::string> const &local_state, bool real = true);

product_state(block::Block, local_states::Vector{String}; real::Bool=true)

Parameters

Name Description
block block on which the state is defined
local_states local configurations of the product state
real flag whether real state is created

random_state

Create a filled random state with normal \(\mathcal{N}(0, 1)\) distributed coefficients.

State random_state(Block const &block, bool real = true, int64_t seed = 42, bool normalized = true);

random_state(block::Block; real::Bool=true, seed::Int64=42, normalized::Bool=true

Parameters

Name Description
block block on which the state is defined
real flag whether real state is created
seed random seed determining the precise random numbers
normalized flag whether the state is normalized

zero_state

Create a filled state with all zero entries.

State zero_state(Block const &block, bool real = true, int64_t ncols = 1);

zero_state(block::Block; real::Bool=true, ncols::Int64=1)

Parameters

Name Description
block block on which the state is defined
real flag whether real state is created
ncols number of columns in the state

zero

Set all coefficients of a given state to zero.

void zero(State &state);

zero(state::State)

Usage Example

auto block = Spinhalf(2);
auto state = product_state(block, {"Up", "Dn"});
XDIAG_SHOW(state.vector());

zero(state);
XDIAG_SHOW(state.vector());

state = random_state(block, false, 1, 1234, true);
XDIAG_SHOW(state.vectorC());

state = zero_state(block, true, 2);
XDIAG_SHOW(state.vector());

block = Spinhalf(2)
state = product_state(block, ["Up", "Dn"])
display(vector(state))

zero(state)
display(vector(state))

state = random_state(block, real=false, seed=1234, normalized=true)
display(vector(state))

state = zero_state(block, real=true, ncols=2)
display(matrix(state))