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Quantum Computing : Recent Questions and Answers (Page 72)

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

No backends assigned to my Account

When I open my account on IBM Quantum Experience, I am shown 9 backends that are assigned to me. But when...

Asked on 12/03/2020 by Hina

1 answer

Local operations and classical communication (LOCC) on quantum system

I'm currently busy learning about the basics of quantum information theory. Does anyone know how the measurement described in the wiki link LOCC is a measurement on...

Asked on 12/03/2020

1 answer

Is it right to think of superposition as just angle?

Based on my current understanding, a qubit is represented as a vector $(a, b)$ which satisfy $a^2 + b^2 = 1$. Classical bit one can be represented...

Asked on 12/02/2020 by Wong Jia Hau

2 answer

Return outputs with zero counts

I am running a simple 3 qubit circuit which produces the following results:{'000': 5, '001': 3, '010': 10, '100': 5, '101': 7, '110': 7, '111': 4}There are no counts...

Asked on 12/02/2020 by LOC

1 answer

Proof of the no-communication theorem

Let $A, B$ be (finite-dimensional) Hilbert spaces, and $rho$ some mixed state of $A otimes B$. I am trying to show that a measurement performed on the...

Asked on 12/01/2020

2 answer

Other than distance, what other metrics can be used to compare quantum error correcting codes?

Using classical error correction (or channel coding) as a reference, I'd like to be able to compare QECC's from different constructions. Distance is a reasonable measure and you can argue...

Asked on 12/01/2020

2 answer

Is the Elitzur-Vaidman bomb tester an example of adiabatic evolution?

I'm trying to grok more of the adiabatic model. I also really enjoyed O'Donnell's lecture on the Elitzur-Vaidman bomb tester. The familiar setup involves a test...

Asked on 12/01/2020

0 answer

Hadamard gate for three qubits; inconsistency between IBM and Matlab

I am trying to build a large and quite complex three qubit quantum circuit on IBMs quantum computer. I have a specific unitary which I am trying to implement and...

Asked on 12/01/2020

1 answer

What is the difference between Qiskit execute and the IBMQJobManager?

I was researching how to submit multiple pulse schedules/circuits in the same job and came across 2 methods:Executing Experiments with qiskit.executeand IBMQJobManager.runWhat are the...

Asked on 11/30/2020

1 answer

Why IBM Quantum Experience is giving different results under ibmq_qasm_simulator and ibmq_16_melbourne?

I am trying to run following 6 qubit quantum circuit and I am getting different results under ibmq_qasm_simulator and ibmq_16_melbourne (both involving 8192 shots). What is the reason? ibmq_qasm_simulator ::...

Asked on 11/29/2020

2 answer

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