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Quantum Computing : Recent Questions and Answers (Page 74)

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

Changing qubits coefficients to trigonometric functions in Grover Algorithm

In this paper, in Appendix B.1 (Grover's Search Algorithm and Grover Operator G), it does a change of coefficients, such as what is done for the Bloch...

Asked on 10/19/2020 by Bertolino

1 answer

On the probability of preparing of a uniform superposition by performing a controlled-multiplication and post-selecting $0$

I take as a starting point Watrous's celebrated paper defining the Quantum Merlin-Arthur (QMA) class. He provides a protocol for Arthur to test whether an...

Asked on 10/16/2020 by Mark S

1 answer

How are Franson Interferometers used to prove security in Photonic QKD Experiments?

I am currently reading this paper about Quantum Key Distribution Protocols which use Franson Interferometers to secure against eavesdroppers. I am having trouble understanding how the interferometers...

Asked on 10/14/2020 by Dunbar Birnie

0 answer

Does quantum computers give any advantage over classical computers in Sudoku?

To my basic knowledge I know that solving a generalized Sudoku problems is an NP-complete problem so, is there any possible way quantum computers give an advantage over classical computers...

Asked on 10/13/2020 by yousef elbrolosy

1 answer

Why do we use two optical modes per qubit in the KLM scheme?

The original KLM paper says: The basic states of a bosonic qubit encoded in modes $l_1$ and $l_2$ are $|0ranglemapsto|0rangle_{l_1}|1rangle_{l_2}$ and $|1ranglemapsto|1rangle_{l_1}|0rangle_{l_2}$. Why...

Asked on 10/11/2020

1 answer

How to get state vector from QasmSimulator in Qiskit

I'm currently able to get state vector in Qiskit using state_vector backend using something like :backend = Aer.get_backend('statevector_simulator')job = execute(qc, backend=backend, shots=1, memory=True)job_result = job.result()print(job_result.get_statevector(qc))But now I would like...

Asked on 10/08/2020

1 answer

Change the position of a gate in Qiskit for better representation

I'm using Qiskit to demonstrate some circuits, and I want to change the position of some gates for better representation. For example, look at this circuit: ...

Asked on 10/07/2020 by A. Jahin

1 answer

N-Qubit Hadamard vs Quantum Fourier Transform

Both Simon's algorithm and the algorithm for period finding begin by placing qubits in the equal superposition state, but Simon's algorithm uses the n-qubit Hadamard $H^{otimes n}$ while the...

Asked on 09/27/2020 by Marc Bacvanski

1 answer

How to get the CNOT error rate between 2 qubits on a given IBMQ Backend?

How can the CNOT gate error between 2 qubits as shown on visual qubit coupling map on the IBMQ Dashboard be retrieved in Qiskit using the BackendProperties.gate_error...

Asked on 09/26/2020 by MShakeG

2 answer

Circuit of quantum error correction code

I read an interesting paper of QEC with only two extra qubits. In the paper, there is a circuit. Note that ...

Asked on 09/23/2020

1 answer

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