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Quantum Computing : Recent Questions and Answers (Page 6)

Find answers to your questions about Quantum Computing or help others by answering their Quantum Computing questions.

How to find the reduced density matrix of a four-qubit system?

I have the state vector $|prangle$ made up of 4 qubits. Say system A is made up of the first and second qubits while system B is made up...

Asked on 09/05/2021

2 answer

Can one operator commute with four other operators?

I want to know whether I can have a operator $A$ which commutes with four other operators $M_1$, $M_2$, $M_3$, and $M_4$ (for instance, drawing...

Asked on 09/05/2021 by Xuemei

2 answer

How to add scalar to quantum string

I need a way to add scalar values to a quantum string. Say if$| v rangle = |1 1 0 rangle + |1 0 1 rangle$ ...

Asked on 09/05/2021

3 answer

Quantum Principal Component analysis by Seth Lloyd

I am currently reading the paper quantum principal component analysis from Seth Lloyd's article Quantum Principal Component Analysis There is the following equation stated.Suppose that on is...

Asked on 09/05/2021 by Nap0leon

1 answer

How is quantum error applied to the qubits?

I am trying to check the way qiskit has the noise implemented. I have read how is this theoretically done using quantum channels (see Nielsen and Chuang chapter 8) and...

Asked on 09/05/2021

1 answer

What is the difference between the action of $Z$ and $exp(-i Z t)$ on a state?

What is the difference between performing $Z$ operation and performing $e^{-i Zt}$ operation on a state, given that $e^{-i Zt}= mathbb{1} + (-i Zt) + ...$ is...

Asked on 09/05/2021

1 answer

Could someone give an example of this pic?

This is a picture from Wiki(https://en.wikipedia.org/wiki/Quantum_logic_gate). Can someone give me a simple example by using two qubits? ...

Asked on 09/05/2021 by WilliamYang

1 answer

Show that $I = frac{rho + sigma_xrhosigma_x +sigma_yrhosigma_y + sigma_zrhosigma_z}{2}$ for all states $rho$

I am trying to show that for any qubit state p, the following holds: $$I = frac{rho + sigma_xrhosigma_x +sigma_yrhosigma_y + sigma_zrhosigma_z}{2}$$ I have tried different manipulations,...

Asked on 09/05/2021 by evethompson123

7 answer

Does Controlled-U gate entangle qubits?

I've read C-NOT gate entangles qubits, but is it only for C-NOT or any arbitrary CU gate (apart from the likes if CI) entangles qubits? ...

Asked on 09/05/2021 by Ajay Rao

1 answer

Do I have to upgrade to personal computer or laptop computer in order to be able to use the IBM Quantum Experience website or run code locally?

I currently have a tablet I don't have a desktop or laptop to access the IBM Quantum Experience. Do I have to upgrade to personal computer or laptop computer in...

Asked on 09/05/2021 by Jaime Silverio

2 answer

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