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I built a circuit in Qiskit with two GHZ states. In the beginning, I created the superposition $\sim\bigg(|0000\rangle+|0101\rangle+|1010\rangle+|1111\rangle\bigg)$ with two $H$s, and two $CNOT$s.

Now, I want to amplify the result $|1111\rangle$ to over $50\%$. The maximum I got was around $40\%$, and for this case, I calculated that I needed only one iteration. I also tried more, but with no success.

I built a circuit in Qiskit with two GHZ states. In the beginning, I created the superposition $\sim\bigg(|0000\rangle+|0101\rangle+|1010\rangle+|1111\rangle\bigg)$ with two $H$s, and two $CNOT$s.

Now, I want to amplify the result $|1111\rangle$ to over $50\%$. The maximum I got was around $40\%$, and for this case, I calculated that I needed only one iteration. I also tried more, but with no success.

Edit: Can anyone tell me how to implement Amplitude Amplification without needing to apply state initialization operator and the inverse of it because the state initialization operator could be highly complex?

I built a circuit in Qiskit with two GHZ-states. At the beginning I create with two Hadamards and two Cnots the superposition of 0000+0101+1010+1111. Now i want to amplify the result 1111 to over 50%. The maximum I got was around 40% and for this case i calculated that I need only one iteration. I also tried more, but with no success.

I built a circuit in Qiskit with two GHZ states. In the beginning, I created the superposition $\sim\bigg(|0000\rangle+|0101\rangle+|1010\rangle+|1111\rangle\bigg)$ with two $H$s, and two $CNOT$s. 

Now, I want to amplify the result $|1111\rangle$ to over $50\%$. The maximum I got was around $40\%$, and for this case, I calculated that I needed only one iteration. I also tried more, but with no success. 

I built a circuit in Qiskit with two GHZ-states. Now i want to amplify the result 1111 to over 50%. The maximum I got was around 40% and for this case i calculated that I need only one iteration. I also tried more, but with no success.

I built a circuit in Qiskit with two GHZ-states. At the beginning I create with two Hadamards and two Cnots the superposition of 0000+0101+1010+1111. Now i want to amplify the result 1111 to over 50%. The maximum I got was around 40% and for this case i calculated that I need only one iteration. I also tried more, but with no success.