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Quantum Computing : Recent Questions and Answers

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

SWAP specific phase components of two qubits

Is it possible to perform an operation on two qubits with initial states as follows: $$q_1: 1/sqrt(2)(|0rangle + exp(0.a_1a_2a_3)|1rangle)$$$$q_2: 1/sqrt(2)(|0rangle + |1rangle)$$ To resultant state:- $$q_1:...

Asked on 01/03/2022

1 answer

Why I am not getting approximate equiprobable states in the following circuit on IBM Q simulator?

I have the following circuit which consists of symmetric modules. I compiled the circuit in IBM Quantum experience backend - ibmq_qasm_simulator, 8192 shots. The result is not equiprobable. Why? Since...

Asked on 01/01/2022

1 answer

Why are non-Clifford gates more complex than Clifford gates?

There are two groups of quantum gates - Clifford gates and non-Clifford gates. Representatives of Clifford gates are Pauli matrices $I$, $X$, $Y$ and $Z$, Hadamard...

Asked on 12/30/2021

1 answer

QFT on timeseries Data and compare results with classical FFT

Intention - To learn and apply QFT on time-series data and compare the result with classical FFT. Data Used - Small timeseries data of 16 points -array([ ...

Asked on 12/27/2021

0 answer

Can't append multiple times with self-defined oracle

import cirqdef set_io_qubits(qubit_count): input_qubits = [cirq.GridQubit(i, 0) for i in range(qubit_count)] return (input_qubits)def debug_oracle(input_qubits): yield (cirq.H(input_qubits[0]))def make_grover_circuit(input_qubits, oracle): ...

Asked on 12/18/2021

1 answer

How to create the logical $|0_Lrangle$ state for the Steane's 7-qubit code?

I don't know how to prepare using Qiskit the following state in order to implement a Steane's 7-qubit code circuit (I omit the normalization factor):begin{align*} |0_Lrangle =&|0000000rangle+|1010101rangle+|0110011rangle+|1100110rangle+\...

Asked on 12/18/2021

2 answer

What separable $rho$ only admit separable pure decompositions with more than $mathrm{rank}(rho)$ terms?

As shown e.g. in Watrous' book (Proposition 6.6, page 314), a separable state $rho$ can always be written as a convex combination of at most ...

Asked on 12/13/2021

1 answer

Is the gate-based model of QC universal?

I have heard this is the case but can not find a source even discussing this. Can any problem that can be solved by a Quantum Computer, also be solved...

Asked on 12/11/2021

2 answer

How do I build a gate from a matrix on Qiskit?

I'm creating a gate for a project and need to test if it has the same results as the original circuit in a simulator, how do I build this gate...

Asked on 12/09/2021

6 answer

Circuit for implementing Steane's code for Quantum Error Correction

I was reading about the Steane's code for QEC. However I could not find any implementation or circuit describing its creation. Can anyone share/explain how the Steane's code could be...

Asked on 12/05/2021

1 answer

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