Tag: quantum-information

9 How can quantum decoherence be managed? 2018-03-28T07:30:39.697

8 How would a Quantum Computer (network) perform loophole-free Bell tests? 2018-05-18T05:15:35.113

8 Estimate/determine Bures separability probabilities making use of corresponding Hilbert-Schmidt probabilities 2018-07-13T22:30:05.923

8 Simplest algorithm for intuitively demonstrating quantum speed-up? 2018-08-07T01:59:38.123

8 Relation between quantum entanglement and quantum state complexity 2018-10-29T15:02:53.143

8 Building Intuition for Relative Von Neumann Entropy 2018-12-19T07:08:21.060

8 What does "bipartite" mean? 2019-05-04T09:08:55.987

7 Advances in Quantum Channel Capacity 2018-06-29T08:09:05.213

7 Has anyone analyzed multi-round nonlocal games? 2018-07-03T00:41:59.707

7 Is there a classical limit to quantum computing? 2018-09-05T10:23:49.770

7 Is there a relation between the factorisation of the joint conditional probability distribution and Bell inequality? 2018-09-08T12:21:21.077

7 Generalization for $n$ quantum teleportations 2018-09-09T01:17:57.037

7 Collective measurements: importance and realization 2018-09-25T13:17:47.417

7 Controlling high-dimensional Hilbert spaces with a single qubit 2018-11-10T10:53:36.730

7 Are correlations stronger than those allowed by quantum mechanics possible? 2018-11-11T17:33:19.187

7 Is the set of all states with negative conditional Von Neumann entropy convex? 2018-12-19T06:29:21.573

7 Quantum teleportation with moving Alice and Bob 2019-02-10T20:16:01.040

7 Will quantum computers be able to solve the game of chess? 2019-04-01T04:13:40.190

7 How should we interpret these quantum logic gates as physical observables? 2019-04-26T01:28:55.697

7 Does the Choi-Jamiolkowski isomorphism really establish a connection between kinematics and dynamics? 2019-06-19T16:42:58.393

6 Is the Kraus representation of a quantum channel equivalent to a unitary evolution in an enlarged space? 2018-05-14T08:18:45.467

6 Degeneracy of Quantum Error Correction Codes 2018-05-14T10:19:31.483

6 Breakthroughs in quantum computing using non-standard quanta 2018-07-10T07:05:52.297

6 Rotationally invariant maximally entangled states in higher dimensions 2018-10-05T05:47:57.757

6 Relating min-entropy with conditional entropy 2018-10-09T21:13:55.337

6 Partial trace over a product of matrices - one factor is in tensor product form 2018-12-25T08:15:27.197

6 Quantum circuit for computing fidelity 2019-05-02T06:01:38.453

5 Accessible information of system vs system, apparatus and environment 2018-04-27T17:53:00.170

5 Generating algebra from commutation 2018-06-19T10:58:31.203

5 How can blackholes be fast information scramblers? 2018-10-29T16:20:34.637

5 Definition of locality in Bell experiments 2018-11-15T07:05:23.733

5 Deduce the Kraus operators of the dephasing channel using the Choi 2018-11-16T17:04:46.437

5 How many Kraus operators are required to characterise a channel with different start and end dimensions? 2018-12-06T18:35:41.847

5 Is the set of classical-quantum states convex? 2018-12-27T22:13:23.120

5 Quantum teleportation of a state, from one of two bases 2019-03-27T01:47:09.047

5 Understanding this description of teleportation 2019-04-14T23:22:52.623

5 What's the difference between Kraus operators and measurement operators? 2019-04-25T09:40:12.120

5 Superoperator cannot increase relative entropy 2019-05-05T21:23:27.183

5 Quantum fidelity simplified formula while both of the density matrices are single qubit states 2019-06-13T16:11:03.647

5 What is the motivation for Weyl matrices in quantum information theory? 2019-06-14T06:14:19.340

4 What is the difference between signaling and non-signaling quantum correlations, and what is a signaling channel? 2018-03-30T14:29:03.303

4 Local operations and classical communication (LOCC) on quantum system 2018-04-17T19:39:44.590

4 How could a global quantum network be realized? 2018-06-21T09:58:57.613

4 Image of a sum of positive operators contains the images of each individual operator? 2018-09-05T01:07:22.730

4 EA-Turbo simulation package 2018-09-17T10:39:51.347

4 Experimental Realization of Superactivation of Quantum Capacity 2018-09-20T09:52:12.343

4 Suggest, partly based upon limited numerical results, possible “elegant” exact formulas for Bures two-qubit separability probability 2018-10-10T21:49:55.737

4 Do the probability amplitudes of the superposition state produced by the QFT transform convey useful information? 2018-10-17T08:52:23.567

4 What is the quantum bandwidth of a planar array of noisy qubits, assuming free classical communication? 2018-11-18T02:33:56.853

4 Quantum channel Holevo information additivity: proof approach 2018-11-20T10:28:44.077

4 Determining whether $P(ab|xy)$ factorizes in Bell experiments 2018-11-21T19:35:37.000

4 Shannon entropy is least when Measurement basis = Mixture basis 2018-12-16T18:55:11.153

4 Defining entanglement for systems with more than two qubits 2019-01-15T09:00:18.653

4 Real-life examples of classical-quantum channels 2019-01-22T16:25:48.343

4 Non-uniqueness of pure states ensemble decomposition 2019-01-24T11:40:42.563

4 Why is $P(1,2)_{\text{same}} = \frac{1}{4}$ and not $\frac{1}{2}$ in Preskill's Bell experiment? 2019-02-03T11:21:51.520

4 Connection between the definitions of concurrence for a two-qubit states 2019-02-18T11:43:28.083

4 For 2x2 and 2x3 systems, is the partial transpose the only positive but not CP operation? 2019-02-18T13:15:38.507

4 Convex Combination of Separable States 2019-02-27T09:23:21.687

4 Understanding quantum circuit diagrams: a circuit that compares two states $|YX\rangle$ and $|AB\rangle$ 2019-03-26T11:59:33.720

4 Understanding classical vs. quantum channel capacities 2019-04-02T09:00:43.407

4 How is the expression for the optimal entanglement witness derived? 2019-04-02T10:50:16.107

4 Are X-state separability and PPT- probabilities the same for the two-qubit, qubit-qutrit, two-qutrit, etc. states? 2019-04-06T16:40:35.753

4 Finding separable decompositions of bipartite X-states using the methodology of Li and Qiao 2019-04-22T18:59:36.443

4 Is there a two-qudit Choi entanglement witness $W^{(+)}$? 2019-05-01T03:56:55.710

4 Complexity analysis of separability in the multipartite case 2019-05-04T22:34:49.467

4 Degradable channels and their quantum capacity 2019-05-09T15:39:08.343

4 Are entanglement witnesses of this form optimal? 2019-05-12T09:16:41.273

4 Explicit 16⨯16 matrix representations of two-qudit entanglement witnesses 2019-05-13T16:23:28.473

4 How are witness operators physically implemented? 2019-05-14T07:35:55.500

4 CTCs and information time travel — what non-trivial insights do they lead to? 2019-05-19T10:53:28.460

4 Structural Physical Approximation of Partial Transpose 2019-05-21T09:45:51.753

4 How to implement NM Algorithm for Variational Quantum Eigensolver? 2019-06-23T02:24:04.223

4 How to express a probability distribution $P(x,y,z)= \sum_\lambda P(x|y,\lambda)P(y|\lambda,z)P(z)P(\lambda)$ in terms of a trace of a density matrix? 2021-02-16T16:17:57.617

3 Could we use varying voltage with programmable gates? 2018-10-30T00:46:36.270

3 Semidefinite program for conditional min-entropy 2018-11-10T20:54:48.007

3 Polarization and qubit information 2018-11-13T03:26:03.243

3 How to transfer non maximally entangled state to maximally entangled? 2018-11-15T20:31:26.817

3 Total mutual information of a quantum system 2018-11-19T11:52:13.937

3 Convention for expressing measurement in non-standard basis 2018-11-21T20:09:54.320

3 Isometric Extension of an Erasure Channel 2018-11-26T22:23:24.493

3 Dephasing channels 2018-12-04T15:32:39.533

3 Can "experimental data from a quantum computer" be used to test separability probability conjectures? 2019-02-02T16:46:48.143

3 EPR states with permuted qubits 2019-03-07T00:46:30.620

3 How does quantum memory work using atoms? 2019-03-17T15:10:38.833

3 What are the ranges of the four $q$ parameters in the magic simplex of Bell states formula? 2019-04-19T14:49:05.673

3 Proof of joint entropy theorem 2019-05-06T16:26:44.240

3 Counting channel uses of the lossy bosonic channel or definition of channel uses 2019-05-08T09:50:26.760

3 Quantum channel cannot increase Holevo information of an ensemble 2019-05-09T09:58:49.123

3 Trace distance of two classical-quantum states 2019-05-16T16:03:28.727

3 Simultaneous eigenstate of commuting observables and their tensor product 2019-05-29T18:22:00.130

3 What are nontrivial examples of $n$-sharable bipartite states? 2019-06-03T12:12:55.817

3 What is Landauer’s principle? 2019-06-12T09:48:26.763

3 How to find a common eigenstate of commuting operators? 2019-06-14T20:59:06.113

3 Bell State 11 not working for parity curve 2019-06-18T09:28:07.900

3 Geometric interpretation of 1-distillability 2019-06-18T15:30:59.693

3 Measuring Coherence Length for T1 and T2 values with IBMQ Experience 2019-06-27T14:50:37.827

2 The classical simulation of 2D graph state and the measurement based quantum computation 2018-10-29T14:17:55.073

2 Are the eigenvalues of an observable always -1 and 1? 2018-11-16T18:34:41.243