Bit Strings

BitString(numbits)

Representation of the state of a register of bits. Can also represent the state of a register of qubits with defined values for each qubit (0 or 1).

Examples

julia> BitString(16)
16-bits BitString with integer value 0:
  00000000 00000000

julia> bs = BitString(16, [1,2,3,4])
16-bits BitString with integer value 15:
  11110000 00000000

julia> bs[10] = 1
1

julia> bs
16-bits BitString with integer value 527:
  11110000 01000000

julia> bitstring_to_integer(bs)
527

julia> typeof(ans)
BigInt

julia> bitstring_to_integer(bs, Int)
527

julia> typeof(ans)
Int64

There are many different ways to get bit states:

julia> bs = BitString(30, 2344574)
30-bits BitString with integer value 2344574:
  01111110 01100011 11000100 000000

julia> ones(BitString, 10) # or also trues(BitString, 10)
10-bits BitString with integer value 1023:
  11111111 11

julia> zeros(BitString, 10) # or also falses(BitString, 10)
10-bits BitString with integer value 0:
  00000000 00

julia> BitString(16) do i
           iseven(i)
       end
16-bits BitString with integer value 43690:
  01010101 01010101

bitstring_to_index(bitstring)

Convert a bitstring into the corresponding index.

This is useful for indexing, for example, a vector of states.

bitstring_to_integer(bitstring[, T])

Convert a bitstring into its corresponding integer.

nonzeros(bitstring)

Return the indices of the non-zero qubits in a bit state.

to01(bitstring[, endianess=:big])

Converts a BitString into a string of 0 and 1 characters. Optionally endianess can be specified, which can be either :big or :little.

Examples

julia> to01(bs"10011")
"10011"

julia> to01(bs"10011"; endianess=:big)
"10011"

julia> to01(bs"10011"; endianess=:little)
"11001"

tobits(bitstring)

Get the underlying BitVector of a bit state.

macro bs_str(s)

Convert a string into a bit state.

Examples

julia> bs"101011"
6-bits BitString with integer value 53:
  101011