We will study the time-evolution of a finite dimensional quantum system. To this end, let us conside

Hallie Watts

Hallie Watts

Answered question

2022-04-18

We will study the time-evolution of a finite dimensional quantum system. To this end, let us consider a quantum mechanical system with the Hilbert space C2. We denote by |0⟩ and |1⟩ the standard basis elements (1,0)T and (0,1)T. Let the Hamiltonian of the system in this basis be given by
H=ω0110=0-i-i0
and assume that for t=0 the state of the system is just given by ψ(t=0)=0. In the following, we also assume natural units in which h=1.
We expand the state at time t in the basis |0⟩, |1⟩ so:
Psi(t)=α0(t)0+α1(t)1
Problems: Use Schrödinger's equation in order to derive a differential equations for α0 and α1:
(i) Find a solution given the initial conditions.
(ii) What is the probability that the system can be measured in |1⟩ at some time t?

Answer & Explanation

mislifola5vo

mislifola5vo

Beginner2022-04-19Added 11 answers

Step 1
|Ψ(t)>>=(α0(t)α1(t))
Step 2
Then the Schrödinger equation tells us:
ihtPsi(t)=HPsi(t)
itα0(t)α1(t)=0-i-i0α0(t)α1(t)
Although I will say I'm a little confused as to why the Hamiltonian isn't diagonalized in what I'm assuming is the energy basis given this a two level system.

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