Quantum Computing

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Awarded 469 times.
What is the complexity of estimating the expectation value of an observable?
Awarded Nov 24 at 17:16
Is Qiskit more popular than cirq? Why?
Awarded Nov 23 at 12:50
What can tensor networks mean for quantum computing?
Awarded Nov 22 at 13:56
If Majorana qubits are analogous to surface codes, why do the diagrams use lines instead of squares?
Awarded Nov 20 at 9:58
A rigorous definition for an exponential quantum advantage
Awarded Nov 10 at 19:36
Oracle for welded tree walk
Awarded Oct 28 at 5:32
Who discovered the phase kickback trick?
Awarded Oct 22 at 10:18
What is the "Stinespring Dilation"?
Awarded Sep 30 at 16:57
What precisely is the quantum extended Church-Turing thesis?
Awarded Sep 30 at 7:17
Are there any uses for Shor's algorithm other than breaking public key cryptography
Awarded Sep 19 at 0:56
Is there quantum advantage to be had with a D-Wave computer in 2020?
Awarded Sep 12 at 21:27
What are the possible non-entangling two-qubit gates?
Awarded Sep 6 at 1:27
Did D-Wave show quantum advantage in 2023?
Awarded Sep 2 at 8:25
Quantum algorithm for linear systems of equations (HHL09): Step 2 - Preparation of the initial states $|\Psi_0\rangle$ and $|b\rangle$
Awarded Aug 29 at 21:18
Definition of the Pauli group and the Clifford group
Awarded Aug 25 at 13:20
Quantum algorithm for linear systems of equations (HHL09): Step 2 - What is $|\Psi_0\rangle$?
Awarded Aug 21 at 12:05
AWS Braket Backend for Qiskit?
Awarded Aug 18 at 0:56
Why are diagonal Hamiltonians considered classical?
Awarded Aug 17 at 22:25
Preparing a quantum state from a classical probability distribution
Awarded Aug 14 at 14:32
What components are needed to realize a photonic CNOT gate?
Awarded Jul 19 at 14:48
How are quantum algorithms devised?
Awarded Jul 14 at 4:26
Are there any quantum algorithms conjectured to give an exponential speedup for a non-oracle problem that don't use the Quantum Fourier Transform?
Awarded Jul 4 at 18:21
What is a Haar random quantum state?
Awarded Jun 29 at 11:46
Resources to study quantum algorithms and quantum complexity
Awarded Jun 20 at 22:32
How does evolving a two-qubit state through a CNOT gate entangle them?
Awarded Jun 12 at 3:09
Grover's algorithm in a nutshell
Awarded Jun 3 at 7:45
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 whether a bipartite high-dimensional 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
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