| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849 |
- =================
- Quantum Registers
- =================
- QCGPU provides a class to represent the register, ``qcgpu.State``. The
- register class stores (on the OpenCL device) a state vector. This state
- vector is a chunk of memory, the size of which is:
- .. math::
- 64 \cdot 2^n \text{ bits}.
- This means you would need just 2kb of memory to have a 5 qubit register,
- a 30 qubit register would take up 9gb of memory.
- This is something to be aware of, as the state vector must fit in the
- memory of the device you wish to use.
- Using the ``State`` class
- -------------------------
- To create a new register, you can use
- .. code:: python
- import qcgpu
- register = qcgpu.State(5)
- This will create a 5 qubit register.
- When you run this, you may be prompted to choose a device. This is
- normal, as you can have more than 1 device that supports OpenCL in your
- computer. Just choose the one you want.
- Mathematical Description
- -------------------------
- This class represents a state vector :math:`\lvert \psi \rangle` with
- .. math::
- \lvert \psi \rangle = \sum_{j = 0}^{2^n - 1} \alpha_j \lvert j \rangle
- where :math:`n` is the number of qubits, :math:`\alpha_j` is the
- amplitude and the state is :math:`j` runs overall :math:`2^n` basis
- states.
|
