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Quantum Computing : Recent Questions and Answers (Page 4)

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

How do I compare the secret key rate (kbps) with the secret key rate per channel use?

I am doing some research for an undergrad project and have hit a conceptual stumbling block. I have recently been looking at some of the achievements in practical QKD using...

Asked on 10/02/2021

1 answer

IBMQ_Melbourne Readout error

I am trying to simulate an experiment on IBM's melbourne quantum computer and here are the resultsQasm simulator :ibmq_16_melbourne:...

Asked on 10/02/2021

1 answer

Installing Qiskit Error: Building wheel for ecos error

How can I fix this error? I am installing the newest version of Qiskit....

Asked on 10/02/2021 by edbert kwesi

1 answer

Can quantum states have negative probability?

I know that when a qubit is described in a superposition state as $alpha|0⟩ + beta|1⟩$, then the probability of measuring $|0⟩$ is $alpha^2$ and probability of...

Asked on 10/02/2021 by Deepika Bhargava

3 answer

Is it possible to partial trace the $chi$-matrix of $4$ qubits $q_0,q_1,q_2,q_3$ to obtain a description of what happens to $q_1$?

Considering a $chi$-matrix of a circuit with, say, 4 qubits, is it possible to trace out 3 of them from $chi$ - for example qubits $q_0$, ...

Asked on 10/01/2021 by Daniele Cuomo

0 answer

How to undo an operation in qiskit on jupyter notebook?

I am not able to undo an operation. For example, I want a single Hadamard gate on a single qubit but by mistake two Hadamard gate added. Now I want...

Asked on 10/01/2021 by Satish Kumar Dubey

1 answer

Generalized construction of W basis

Although this question deals with the construction of a W-state, I was looking for a general way to find all the orthogonal W-states, given a number of qubits. For...

Asked on 09/30/2021

0 answer

Using matrix inversion and summation together. How to compute $(A+B^{-1})^{-1}|xrangle$

I need to compute $(A+B^{-1})^{-1}|xrangle$, where A and B is hermitian for simplicity. I read out about matrix inversion algorithms (HHL, QSVE,...), and algorithms of summing up of matrices(LCU,...

Asked on 09/30/2021

0 answer

Knill-Laflamme condition and requirements for error correction

Suppose we have a stabilizer group $mathcal{M}$, the Knill-Laflamme condition for error correction statesAn error with Kraus operators ${E_k}$ is correctable if either $$E^dagger_kE_linmathcal{M}quadforall, k,l $$ or...

Asked on 09/29/2021

1 answer

Is the restriction of a strictly contractive channel (SCC) to a subspace necessarily still SCC? (impossibility of perfect QEC for SCCs)

This paper shows the impossibility of perfect error correction for strictly contractive quantum channels, i.e., for channels such that $||mathcal{E}(rho)-mathcal{E}(sigma) ||leq k ||rho-sigma||$, for $0leq...

Asked on 09/28/2021

1 answer

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