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Quantum Computing

Enlightened

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First to answer and accepted with score of 10 or more. This badge can be awarded multiple times.
Awarded 169 times.
What does quantum error correction code notation stand for?
Awarded Jun 1 at 22:55
Explicit Conversion Between Universal Gate Sets
Awarded May 24 at 8:57
Lower bound for Degenerate Codes?
Awarded May 15 at 21:52
Can I remove gates from a QuantumCircuit?
Awarded May 9 at 23:18
Does the trace distance have a geometric interpretation?
Awarded May 8 at 11:40
What does the paper "Training Variational Quantum Algorithms Is NP-Hard (Phys. Rev. Lett. 127, 120502)" mean?
Awarded Apr 16 at 4:33
Is the Clifford group finite?
Awarded Apr 14 at 19:46
Is there a lower bound on the average diamond norm of two uniformly random unitaries U1 and U1 of dimension D that are sampled from haar measure?
Awarded Apr 12 at 20:11
Why is the Toffoli gate not sufficient for universal quantum computation?
Awarded Apr 7 at 0:27
How many N-qubit stabilizer states are there?
Awarded Apr 3 at 21:26
Can the Kraus decomposition always be chosen to be a statistical mixture of unitary evolutions?
Awarded Mar 13 at 7:25
How to show that amount of qubits needed to crack the RSA-2048 protocol using Shor's algorithm?
Awarded Mar 13 at 5:42
Characteristics of the IBM quantum computer
Awarded Mar 10 at 1:02
How power-efficient are quantum computers?
Awarded Mar 7 at 19:03
Prove that the trace distance is upper-bounded by the Hilbert-Schmidt distance
Awarded Jan 26 at 21:02
What are theta, phi and lambda in cu1(theta, ctl, tgt) and cu3(theta, phi, lam, ctl, tgt)? What are the rotation matrices being used?
Awarded Jan 4 at 17:51
Are correlations stronger than those allowed by quantum mechanics possible?
Awarded Dec 6, 2022 at 14:55
What is the relationship between Choi and Chi matrix in Qiskit?
Awarded Nov 29, 2022 at 5:42
Is the Solovay-Kitaev theorem relevant for modern hardware?
Awarded Nov 28, 2022 at 18:26
How to implement the 4 Bell states on the IBM Q (composer)?
Awarded Nov 21, 2022 at 2:34
How to measure in another basis
Awarded Nov 19, 2022 at 3:57
What is the square root of the NOT gate?
Awarded Nov 8, 2022 at 10:21
How to calculate the average fidelity of an amplitude damping channel
Awarded Oct 28, 2022 at 13:25
Explain the representation of the CNOT gate in ZX-calculus
Awarded Sep 29, 2022 at 20:18
How to show a density matrix is in a pure/mixed state?
Awarded Sep 1, 2022 at 21:26
An impossible quantum adder claimed by a journal article?
Awarded Aug 30, 2022 at 15:03
Does Controlled-U gate entangle qubits?
Awarded Aug 30, 2022 at 8:16
Consequences of $MIP^\ast=RE$ Regarding Quantum Algorithms
Awarded Aug 29, 2022 at 13:15
Any simple description of a circuit for Yamakawa-Zhandry algorithm?
Awarded Aug 27, 2022 at 21:48
What is the relation between POVMs and observables (as Hermitian operators)?
Awarded Aug 13, 2022 at 3:47
What does the error rate on the IBMQ website mean？
Awarded Aug 12, 2022 at 15:17
Does anyone know the list of all known universal sets of quantum gates?
Awarded Aug 9, 2022 at 17:27
How to distinguish between collapsed and uncertain qubits in a quantum circuit?
Awarded Jul 25, 2022 at 0:10
Classical XOR gate in Quantum Circuit
Awarded Jul 21, 2022 at 11:11
Matrix definition of the Ising XX gate
Awarded Jul 1, 2022 at 11:52
How are arbitrary $2\times 2$ matrices decomposed in the Pauli basis?
Awarded Jun 15, 2022 at 19:48
Can a Toffoli gate be implemented using Fredkin gates?
Awarded Jun 13, 2022 at 1:31
Can a quantum computer tell whether a program is Turing complete?
Awarded Jun 7, 2022 at 4:06
Implementing a CCCNOT gate using only Toffoli gates
Awarded May 15, 2022 at 23:18
What is a "maximally mixed state"?
Awarded May 11, 2022 at 15:10
Ground state energy estimation - VQE vs. Ising vs. Trotter–Suzuki
Awarded May 9, 2022 at 16:21
Are there quantum algorithms showing a double exponential advantage?
Awarded Apr 27, 2022 at 18:05
Should one learn the math of quantum computing from a "pure" perspective, or are quantum computing texts "good enough"?
Awarded Apr 17, 2022 at 7:50
Can a quantum computer break quantum cryptography?
Awarded Apr 14, 2022 at 19:04
Why are non-Clifford gates more complex than Clifford gates?
Awarded Apr 13, 2022 at 15:48
What is a stabilizer state?
Awarded Mar 28, 2022 at 22:00
How to reduce circuit elements of a decomposed $C^2(U)$ operation?
Awarded Mar 27, 2022 at 9:48
Qiskit CNOT-gate matrix mixup?
Awarded Mar 26, 2022 at 1:10
Quantum machine learning after Ewin Tang
Awarded Mar 8, 2022 at 15:16
How can classical bits be copied if qubits cannot be copied?
Awarded Feb 16, 2022 at 20:48
Does Shor's algorithm end the search for factoring algorithms in the quantum world of computation?
Awarded Jan 23, 2022 at 2:50
Why isn't $Ry(\pi/2)$ gate equivalent to Hadamard gate?
Awarded Jan 12, 2022 at 9:50
How can I decompose a matrix in terms of Pauli matrices?
Awarded Jan 11, 2022 at 5:18
Why doesn't Deutsch-Jozsa Algorithm show that P ≠ BQP?
Awarded Dec 20, 2021 at 1:48
How is Grover's algorithm used to estimate the mean and median of a set of numbers?
Awarded Dec 15, 2021 at 18:11
How good is basic_device_noise_model() simulating the noise in the quantum computer?
Awarded Nov 20, 2021 at 8:30
Who built the first quantum computer using at least two qubits?
Awarded Nov 10, 2021 at 4:26
How to perform quantum state tomography on two qubits?
Awarded Nov 3, 2021 at 13:55
What precisely is quantum annealing?
Awarded Nov 1, 2021 at 10:57
How can one argue that the $S$-gate is Clifford while $T$-gate is not?
Awarded Oct 28, 2021 at 13:04
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