The NMR qubits

The association of the spin states with logical labeling can be done in real systems. For example, let us consider a solution of enriched chloroform, CHCl3. This system can be well approximated by two coupled spins Ii, h with spin Ii being the and spin I2 the H. The relevant NMR interactions are the Zeeman, chemical shifts and the /-coupling, which are represented by the following secular Hamiltonian (see Chapter 2) [2]  

Another aspect of NMR for quantum information processing concerns the coupling between the spins. Many quantum operations involve conditioning the states of two different 

In order to conclude this brief discussion on the NMR implementations of qubits, let us mention the direct dipolar coupled spins. This spin system is becoming quite important in NMR QIP, since many of the candidate approaches to produce scalable NMR quantum computers (see Chapter 7), are based on spin 1 /2 systems in solid-state materials, where 

---