8 Could the Hadamard gate have been constructed differently with similar characteristics? 2019-10-13T01:15:06.540

8 How do I prove that the Hadamard satisfies $H\equiv e^{i\pi H/2}$? 2019-10-22T21:42:34.990

6 How to understand a phase operation between 2 Hadamard gates? 2019-07-27T22:11:23.003

6 Why can the QFT be replaced by Hadamard gates? 2020-02-07T08:57:07.497

5 Finding a global phase that transform the Hadamard gate to an element of $SU(2)$ and propose an evoultion operator which implents the operation 2019-07-18T23:17:31.373

4 Why do multi-bit hadamards expands to what they do? 2020-01-02T02:49:06.890

4 How should I understand the change of qubit's basis as a rotation? 2020-03-14T12:06:08.600

4 Hadamard Test to calculate imaginary part 2020-08-23T21:09:53.923

4 Show that the Hadamard gate is equivalent to a 180 degree rotation of a certain axis 2020-12-29T06:25:48.407

3 How do 2 Hadamard gates act on a single qubit? 2019-08-17T07:41:56.413

3 What is the matrix representation for $n$-qubit gates? 2019-11-13T23:07:22.187

3 Why is implementation of controlled Hadamard on IBM Q so complex? 2020-01-06T17:12:42.747

3 Generate the state $\frac{-|0\rangle + |1\rangle}{\sqrt{2}}$ with qiskit: problem with Pauli-Z behavior 2020-02-11T10:12:09.320

3 $H = e^{i\pi/4} \sqrt{iNOT}$? 2020-04-06T16:29:46.827

3 Hadamard Overlap Test 2020-06-03T12:27:41.287

3 How to translate the Hadamard gate matrix into Dirac notation? 2020-10-04T19:35:47.530

3 Confused about the application of Hadamard gate to uncorrelated qubits 2020-11-02T14:54:22.867

3 How are the IBM's and Google's Hadamard gates fabricated and operated? 2020-11-11T01:25:27.917

3 Transforming $|100\rangle$ state into $|000\rangle + |111\rangle$ state using only Hadamard and CNOT gates 2020-11-15T05:21:14.673

3 Definitions of $D_y$ gate in Hamiltonian simulation: are they the same? 2020-11-16T04:24:55.063

3 Measuring in the computational basis in the single qubit gate QFT implementation 2020-12-08T21:28:08.163

3 Mistake in using dirac notation when applying $X$ gate to vector 2020-12-21T18:11:00.050

3 Show that the two circuits are equivalent mathematically 2020-12-30T01:32:29.290

3 Is it possible to tune the amplitude of superposition generated by Hadamard gates? 2021-01-26T17:18:37.020

2 Projecting $\lvert ++ \rangle$ on Bell Basis 2019-06-20T08:19:10.600

2 Analysis of the second Hadamard in the Detusch-Josza Algorithm 2019-10-01T19:57:14.283

2 Can everything in QM be described with degrees instead of matrices and vectors? 2019-10-03T05:06:03.463

2 Probabilities does not sum up to 1 in simple circuit 2020-04-24T10:12:39.063

2 How can I make qiskit output raw data? 2020-05-07T11:03:58.880

2 Hadamard gate with two inputs in the circuit for the BB84 protocol? 2020-05-27T08:48:15.477

2 Randomness using simple parallel Hadamard circuit 2020-07-14T17:55:39.160

2 Why do we divide by $\sqrt2$ in the qubit states $\lvert\pm\rangle=\frac{1}{\sqrt2}(\lvert0\rangle\pm\lvert1\rangle)$? 2020-07-16T16:39:11.797

2 N-Qubit Hadamard vs Quantum Fourier Transform 2020-07-21T23:34:29.037

2 Prove that QFT and Walsh-Hadamard gates give the same output when acting on $\lvert x\rangle\lvert 0\rangle$ 2020-07-29T00:40:49.723

2 Is there a clear boundary between quantum coupling and quantum entanglement? 2020-10-22T23:12:09.393

2 Transforming $|01 \rangle + |10 \rangle - |11 \rangle \to |01 \rangle - |10 \rangle + |11 \rangle$ 2020-11-08T13:42:32.530

2 How does the outcome of measurement of a qubit change when we use different basis despite the system hasn't changed? 2020-12-24T01:41:00.733

2 How does $U_f$ act on a qudit state in the Deutsch-Josza Algorithm 2021-01-02T09:35:21.967

2 Is there an error on Qiskit.org textbook with the superdense coding section? 2021-01-12T14:01:07.793

2 What is a complexity of producing arbitrary equally distributed superposition? 2021-01-14T12:14:02.420

1 Prove by induction $H^{\otimes n} \left| 0 \right>^{\otimes n} = \frac{1}{\sqrt{2^n}} \sum_{i=0}^{2^n -1} \left| i \right>$ 2019-09-16T19:06:24.063

1 What are the $|+\rangle$ and $|-\rangle$ states? 2020-01-16T10:23:23.660

1 How to construct a IBM Quantum Experience circuit for the following state transformation? 2020-02-12T19:05:38.620

1 Hadamard/Phase/Hadamard and Inversion about the Mean 2020-02-16T03:40:20.377

1 Simple algebraic explanation for normalizing states 2020-03-25T23:13:24.713

1 What happens if $|\psi\rangle$ = $|0\rangle$ or $|\psi\rangle$ = $|1\rangle$ is passed as an input to two Hadamard gates in sequence? 2020-04-20T05:37:44.930

1 Is there a gate that puts a qubit into superposition with a not so purely probabalistic (50 50) outcome? 2020-05-31T22:17:05.887

1 What are the I, X, Z gates in quantum gates? 2020-08-11T07:34:26.123

1 Hadamard direct mapping of input to output in $\theta$ and $\varphi$ form 2020-08-20T07:49:35.360

1 Hadamard gate for three qubits; inconsistency between IBM and Matlab 2020-09-16T22:57:20.080

1 Calculation of the system states and the individual wire states in a quantum circuit 2020-09-30T13:24:02.130

1 How do I apply a Hadamard gate on a given qubit, in matrix formalism? 2020-10-05T05:08:39.950

1 How do I apply the Hadamard gate to one qubit in a two-qubit pure state? 2020-10-08T20:32:23.327

1 Why 2 $H$ gates in series create a probability of 100% for one value of the qubit and 0% of the second value of the qubit? 2020-11-04T09:17:20.090

1 A CNOT between two Hadamard gates: why does the CNOT changed the output of the second Hadamard gate? 2020-12-01T20:26:19.917

1 How to describe the state of a qubit passing through two Hadamard gates? 2021-01-17T16:12:26.133

0 How to undo an operation in qiskit on jupyter notebook? 2020-07-29T07:43:33.670

0 What is the output of applying the Hadamard matrix to $\sum_{y\in\{0,1\}^n} (-1)^{xy}|y\rangle$? 2020-09-07T09:06:33.933

0 What is the matrix representation of the Hadamard gate in the computational basis? 2020-09-17T12:55:23.420

0 Generate a random bit sequence of 512 bits 2020-09-20T04:50:14.940

0 How do two H gates act on two entangled qubits? 2021-02-06T13:28:19.680

-1 Why is a Hadamard gate unitary? 2020-01-03T08:24:55.260

-1 What Hamiltonians generate Hadamard and CNOT? 2021-01-04T07:39:27.777

-2 Is quantum superposition state a truth or an assumption? 2019-11-30T17:47:07.353