We have learned about the quantum version of classic bits, qubits. In this chapter, we will learn about the quantum version of classic registers, quantum registers, which hold quantum states. The chapter will provide code to simulate quantum states and registers in Python. We discuss separable states and entanglement, which leads to a focus on quantum measurement and a Python implementation of quantum measurement for multiple, possibly entangled, qubits. The chapter ends with a description of decoherence and parameters that quantify decoherence, a key figure of merit for quantum computing.
The following topics will be covered in this chapter:
- Quantum states and registers
- Separable states
- Entanglement
- Quantum measurement and entanglement
- Decoherence, T1, and T2