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Quantum Computing

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Awarded 444 times.
Grover's algorithm in a nutshell
Awarded 19 hours ago
HHL algorithm -- why isn't the required knowledge on eigenspectrum a major drawback?
Awarded May 17 at 10:33
Can I remove gates from a QuantumCircuit?
Awarded May 9 at 23:07
In shadow tomography, how is the state reconstructed from its shadows?
Awarded May 5 at 1:40
How is CNOT gate physically implemented in IBM Q?
Awarded Apr 25 at 21:18
Understanding the $M$ upper bound in the paper: "Multipartite entanglement and high-precision metrology"
Awarded Apr 25 at 8:32
What is the complexity of determining if a state is entangled?
Awarded Mar 30 at 9:57
Show that these two expressions for the oracle transformation are equivalent
Awarded Mar 26 at 13:36
Does anyone know the list of all known universal sets of quantum gates?
Awarded Mar 25 at 3:12
In Grover's Algorithm, why does the optimal number of iterations involve a floor?
Awarded Mar 23 at 20:04
Entanglement-assisted hashing bound for asymmetric depolarizing channels
Awarded Mar 22 at 7:42
Qiskit - Z expectation value from counts?
Awarded Mar 20 at 4:05
Quantum advantage with only Clifford gates (Gottesman Knill theorem)
Awarded Mar 13 at 16:28
Why can all quantum circuits be converted into circuits that use only real matrices?
Awarded Mar 12 at 8:34
Quantum attack on hash functions
Awarded Mar 11 at 18:04
Characteristics of the IBM quantum computer
Awarded Mar 10 at 0:17
Status of Google's quantum supremacy claim 2022
Awarded Mar 7 at 0:06
What is the difference between relaxation, dephasing, and decoherence?
Awarded Mar 3 at 10:03
Is there any company that backs and implements diamond vacancy quantum computers?
Awarded Feb 25 at 15:17
Does the symmetric logarithmic derivative operator have a geometric interpretation?
Awarded Feb 13 at 19:40
Number of qubits to achieve quantum supremacy?
Awarded Feb 11 at 15:05
Comparing method of differentiation in variational quantum circuit
Awarded Feb 9 at 20:41
What does it mean for a density matrix to "act on a Hilbert space $\mathcal{H}"$?
Awarded Dec 29, 2022 at 5:40
How to show that an n-level system is entangled?
Awarded Dec 22, 2022 at 12:27
What is the relation between POVMs and observables (as Hermitian operators)?
Awarded Dec 6, 2022 at 3:55
What is a flying qubit?
Awarded Nov 18, 2022 at 14:52
How can I calculate the inner product of two quantum registers of different sizes?
Awarded Nov 14, 2022 at 12:11
Are correlations stronger than those allowed by quantum mechanics possible?
Awarded Nov 11, 2022 at 7:25
Can a quantum computer break quantum cryptography?
Awarded Nov 11, 2022 at 6:16
How could Majorana particles be used to improve quantum computers?
Awarded Nov 10, 2022 at 23:26
Minimum number of CNOTs for Toffoli with non-adjacent controls
Awarded Oct 28, 2022 at 11:41
How to check if a matrix is a valid density matrix?
Awarded Oct 27, 2022 at 14:37
Categories and types of quantum inspired algorithms
Awarded Oct 26, 2022 at 9:52
How to measure in another basis
Awarded Oct 18, 2022 at 12:47
How does the vectorization map relate to the Choi and Kraus representations of a channel?
Awarded Oct 16, 2022 at 4:57
What is the relation between these two forms of a single-qubit unitary operation?
Awarded Oct 15, 2022 at 8:09
Travelling salesman problem on quantum computer
Awarded Oct 11, 2022 at 5:40
Prove that the trace distance is upper-bounded by the Hilbert-Schmidt distance
Awarded Oct 7, 2022 at 11:06
Why is Deutsch's gate universal?
Awarded Sep 23, 2022 at 11:46
How many logical qubits are needed to run Shor's algorithm efficiently on large integers ($n > 2^{1024}$)?
Awarded Sep 21, 2022 at 16:10
How to quickly calculate the custom U3 gate parameters $\theta, \phi$ and $\lambda$ for any unitary?
Awarded Sep 11, 2022 at 18:48
Does the trace distance have a geometric interpretation?
Awarded Sep 2, 2022 at 7:33
An impossible quantum adder claimed by a journal article?
Awarded Aug 30, 2022 at 18:58
Quantum tensor product closer to Kronecker product?
Awarded Aug 24, 2022 at 14:58
What is a stabilizer state?
Awarded Aug 19, 2022 at 15:40
Are all quantum algorithms hidden subgroup algorithms?
Awarded Aug 18, 2022 at 15:00
Why can't there be an error detecting code with fewer than 4 qubits?
Awarded Aug 15, 2022 at 11:01
Quantum Algorithms for Convolution
Awarded Aug 8, 2022 at 5:21
Does the oracle in Grover's algorithm need to contain information about the entirety of the database?
Awarded Jul 28, 2022 at 3:42
Are qudit graph states well-defined for non-prime dimension?
Awarded Jul 19, 2022 at 9:34
Does quantum control allow to implement any gate?
Awarded Jul 14, 2022 at 10:30
Big Endian vs. Little Endian in Qiskit
Awarded Jul 10, 2022 at 4:35
Why was Feynman hesitant about simulating fermions with a quantum computer?
Awarded Jul 8, 2022 at 13:19
What do the off-diagonal elements of a density matrix physically represent?
Awarded Jul 8, 2022 at 2:25
What does quantum error correction code notation stand for?
Awarded Jun 28, 2022 at 18:37
Why does a Hamiltonian have to be Hermitian?
Awarded Jun 14, 2022 at 3:11
Significance of Clifford operations from quantum error correction perspective
Awarded Jun 13, 2022 at 16:48
Is it possible to run a general implementation Shor's algorithm on a real IBM quantum computer at least for N = 15?
Awarded Jun 8, 2022 at 9:46
Minimum number of T gates needed to perform two overlapping Toffolis
Awarded Jun 7, 2022 at 8:17
How many qubits would be needed to do boson sampling in Qiskit?
Awarded Jun 6, 2022 at 9:34
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