Tag: hhl-algorithm

23 What could be the possible future applications for HHL algorithm? 2018-07-10T15:42:37.447

13 Quantum phase estimation and HHL algorithm - knowledge of eigenvalues required? 2018-07-04T09:01:53.217

12 Quantum algorithm for linear systems of equations (HHL09): Step 1 - Confusion regarding the usage of phase estimation algorithm 2018-06-19T08:00:32.173

9 Quantum algorithm for linear systems of equations (HHL09): Step 2 - What is $|\Psi_0\rangle$? 2018-06-19T11:03:29.097

9 Quantum algorithm for linear systems of equations (HHL09): Step 2 - Preparation of the initial states $|\Psi_0\rangle$ and $|b\rangle$ 2018-06-24T07:08:52.883

9 HHL algorithm -- why isn't the required knowledge on eigenspectrum a major drawback? 2018-07-05T09:26:05.297

9 Does the quantum Fourier transform have many applications beyond period finding? 2020-02-13T04:14:58.097

8 Quantum algorithm for linear systems of equations (HHL09): Step 1 - Number of qubits needed 2018-06-19T08:40:02.743

8 Practical implementation of Hamiltonian Evolution 2018-07-20T12:05:30.820

8 Is HHL still BQP-complete when the matrix entries are only in {0,1}? 2020-08-20T00:26:40.450

7 SWAP gate(s) in the $R(\lambda^{-1})$ step of the HHL circuit for $4\times 4$ systems 2018-07-12T21:32:29.900

7 What exacty is "matrix sparsity" $s$? 2018-08-11T07:51:42.133

7 Efficiently performing controlled rotations in HHL 2018-10-16T05:17:52.070

7 Clarification of the "Calculations" section of the (HHL09) paper 2019-06-11T22:03:29.507

7 Quantum circuit to implement matrix exponential 2020-03-28T10:25:45.057

7 How to recover the normalization constant of the HHL solution 2020-12-30T01:36:56.127

6 How exactly is the stated composite state of the two registers being produced using the $R_{zz}$ controlled rotations? 2018-07-01T17:07:49.533

6 HHL algorithm -- problem with the outcome of postselection 2018-07-09T15:15:01.957

6 Solving linear systems represented by NxN matrices with N not power of 2 2018-07-27T09:09:01.500

6 How to draw Qiskit's HHL algorithm as a circuit? 2019-11-25T16:43:56.760

5 Why does the quantum linear inversion algorithm allow to implement $e^{-ig(\rho)}$ efficiently using multiple copies of $\rho$? 2018-07-10T16:37:21.980

5 Error: Simulation of "Quantum algorithm for linear systems of equations" for $4\times 4$ systems on Quirk (without SWAP) - Global phase 2018-07-14T23:03:21.847

5 How to speed up the matrix multiplication steps in multi-linear regression? 2018-08-29T20:20:35.390

5 How to find parameters for circuit decomposition of Hamiltonian simulation of any matrix $A$? 2018-11-25T04:24:13.120

5 Quantum algorithm for linear system of equations (HHL) - Final Step: How can I find my vector of solution $|x\rangle$? 2019-03-05T10:41:53.807

5 Controlled unitary from the HHL algorithm – practical implementation using Qiskit 2019-04-17T08:31:27.053

5 Using the HHL algorithm to compute $A |b \rangle$ instead of $A^{-1} |b \rangle$ 2019-06-18T07:25:47.033

5 Showing that Matrix Inversion is BQP-complete - HHL Algorithm 2019-06-26T22:54:49.563

5 New Hybrid-HHL algorithm vs VQLS 2020-05-08T03:35:19.447

5 Why is HHL the popular choice to solve QLSP and not the Childs et al. (2017) algorithm? 2020-12-02T22:40:30.303

4 HHL algorithm -- controlled-by-eigenvalues rotations 2018-07-09T14:56:27.723

4 What does $||A|| = 1$ mean in the definition of QLSP? 2018-08-21T15:48:28.743

4 Why is there no $N$ in the time complexity of the QLSP algorithm by Childs et al.? 2018-10-24T18:37:59.933

4 What are applications of HHL's "simple example" to determine similar stable states of different quantum processes? 2019-04-05T22:24:51.033

4 Does HHL implementation require a priori eigendecomposition? 2019-04-24T13:23:41.997

4 Is HHL executed in a single run? If yes, how do they carry out controlled rotation without knowing eigenvalues? 2019-05-09T19:00:06.383

4 How can I express controlled unitary operation in QPE of this implementation of HHL? 2019-06-05T15:44:25.023

4 In the HHL algorithm, how large should the eigenvalue estimation register be? 2020-11-10T18:36:18.040

4 How to effectively compute eigenvalue rotation in HHL 2020-12-09T17:35:25.530

4 HHL algorithm, How can I get result from register $|b\rangle$? 2021-02-01T08:59:58.657

3 Implementing gate with two parameters using Qiskit in Python 2018-11-26T12:57:30.207

3 Apply the conditional Hamiltonian evolution (HHL) 2019-07-18T14:49:22.767

3 Understanding the filter functions in the HHL algorithm 2019-07-29T00:24:20.643

3 Matrix Inversion is BQP-complete proof in HHL and the probability of measuring $T+1 \leq t \leq 2T$ 2019-08-03T22:31:43.203

3 Any other quantum algorithms than Jozsa-Deutsch decision algorithm, Grover search algorithm, Shor factorization algorithm? 2020-02-20T05:36:53.457

3 Implementation of matrix A in HHL algorithm circuit 2020-02-28T17:01:06.150

3 Problem with controlled rotation in HHL 2020-04-06T07:51:35.047

3 How do I optimize HHL algorithm in Qiskit? 2020-06-19T16:56:53.453

3 Confusion regarding time complexity in the HHL algorithm 2020-07-05T03:09:15.580

3 Comparison of matrix inversion algorithms 2020-08-02T21:44:11.060

3 Is it required to input full matrix when using Qiskit HHL algorithm for sparse matrices? 2020-09-15T00:07:21.433

3 Gate-level implementation of Eigenvalue-Inversion in HHL 2020-12-27T18:45:51.953

3 HHL and choice of observable for calculating the expectation value thereof 2021-01-24T15:53:37.930

3 Efficient QFT-based QPEA complexity 2021-02-03T15:24:13.307

3 HHL algorithm, How to implement exp(iAt) gates? 2021-02-22T11:10:59.287

2 Running HHL tutorial on real backend 2019-09-19T14:14:42.370

2 How to encode eigenvalues of matrix $A$ in solving $A\vec{x} = \vec{b}$ using the HHL Algorithm 2020-02-06T04:02:29.143

2 Quantum circuit to get expectation values of Pauli matrices, given state $|\psi\rangle$ 2020-04-01T07:48:14.407

2 Problem with HHL algorithm on Qiskit 2020-04-16T08:46:34.060

2 Angles of rotation in HHL example 2020-05-25T12:19:54.227

2 The maximum depth possible on quantum computers 2020-06-10T07:59:34.893

2 Error when running HHL algorithm in Qiskit 2020-10-12T13:39:34.933

2 HHL example solution on Qiskit 2020-11-06T20:40:07.863

1 Exponentiating Hermitian Matrix for use in QPE/HHL 2019-11-25T23:55:06.240

1 HHL Algorithm: Relation between Eigenvalues and condition number 2020-01-03T05:49:12.523

1 Where will I find necessary math to understand HHL algorithm? 2020-02-05T13:01:49.507

1 How to prepare the three-dimensional register S in HHL? 2020-02-09T17:54:25.053

1 Explanation of HHL Cirq implementation 2020-03-14T16:33:12.633

1 In the rotation part of HHL algorithm, how do you decompose $R$ in terms of universal gates? 2020-05-13T19:42:53.913

1 Adding Quantum State Tomography Step in Cirq HHL Algorithm Implementation 2020-06-22T16:32:08.913

1 Using matrix inversion and summation together. How to compute $(A+B^{-1})^{-1}|x\rangle$ 2020-07-28T22:25:18.783

1 Help Understanding Line in Source Code 2020-08-25T04:07:47.647

1 How can I use the quantum volume to design the scale of my experiment? 2020-09-17T18:54:33.770

1 How to optimize my HHL algorithm on qiskit? 2020-09-18T23:18:21.650

1 Implementing the HHL algorithm with negative eigenvalues (Cirq) 2020-10-31T06:54:44.500

1 How to increase matrix size and getting high fidelity for HHL algorithm in Qiskit? 2020-11-01T17:45:12.170

1 Given a matrix, how do I proceed with the quantum phase estimation algorithm and choose $\theta$? 2020-11-13T20:56:50.647

1 Why does solving linear systems of equations with HHL return imaginary numbers? 2021-02-16T01:05:43.470

0 Qiskit HHL algorithm BrokenProcessPool error 2020-11-11T10:09:12.087

0 HHL algorithm Qiskit version 2020-11-16T15:07:47.377

-3 Query on the HHL Algorithm in the Qiskit Aqua Library 2021-01-18T16:06:27.503