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Why VQE gives an incorrect ground state energy for a chain of 4 hydrogen atoms?

Awarded Oct 6 '20 at 18:10

fagd

5481 silver badge8 bronze badges

(post deleted or otherwise unavailable)

Awarded Oct 5 '20 at 14:55

Pucha

13 bronze badges

How can i run a quantum circuit with parameterized gates many times on quantum experience?

Awarded Oct 3 '20 at 15:50

Moein sarvaghad

577 bronze badges

How to realize Su-Schrieffer-Heeger model in Qiskit

Awarded Oct 2 '20 at 16:43

A. Jahin

2027 bronze badges

Custom Mixer for QAOA: Error 'Operator' object has no attribute 'primitive_strings'

Awarded Oct 2 '20 at 14:10

Niklas Pirnay

32 bronze badges

How to define Q-operator in Quantum Amplitude Estimation

Awarded Sep 29 '20 at 14:02

VittorioC

812 bronze badges

What does a quantum NOT operation do to an entangled set of qubits?

Awarded Sep 26 '20 at 20:27

S. McGrew

2056 bronze badges

IF statement in OpenQASM on IBM Quantum Experience

Awarded Sep 25 '20 at 7:17

Alternative7

1194 bronze badges

Eigenvalues of a quantum state after partial tracing

Awarded Sep 22 '20 at 20:11

Heather

412 bronze badges

Where does $xy = a + b \pmod 2$ come from in the context of CHSH inequalities?

Awarded Sep 22 '20 at 3:46

radar101

815 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 21 '20 at 21:41

gks

1313 bronze badges

How to re-execute failed jobs in qiskit?

Awarded Sep 20 '20 at 17:33

MShakeG

2818 bronze badges

Qiskit implementation for MPS

Awarded Sep 20 '20 at 8:41

김동민

4671 silver badge8 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 19 '20 at 18:32

RMeiburg

13 bronze badges

Custom Gate/Instruction with classical bits in Qiskit

Awarded Sep 18 '20 at 6:16

DavideFrr

113 bronze badges

CNOT expressed with CZ and H gates by taking into account HZH =X

Awarded Sep 17 '20 at 7:56

Steven Sagona

8803 silver badges12 bronze badges

Counting Achievable Operations

Awarded Sep 15 '20 at 15:05

camble

212 bronze badges

What would be measured if you measure two entangled qubits at exactly the same time?

Awarded Sep 15 '20 at 1:50

Benoy Drenzla

212 bronze badges

Effect of quantum entanglement on measurement

Awarded Sep 13 '20 at 22:17

Sam Benet

414 bronze badges

Can one use a quantum circuit as a pathfinding algorithm?

Awarded Sep 13 '20 at 14:35

skubis17

112 bronze badges

Is entanglement nonincreasing on average by local operations for all possible ensemble decompositions?

Awarded Sep 12 '20 at 19:40

2ub

1335 bronze badges

Question regarding soundness bound in QMA versus QCMA separation

Awarded Sep 11 '20 at 15:26

tsgeorgios

1,2461 gold badge1 silver badge4 bronze badges

How to plot histogram using statevector simulator?

Awarded Sep 10 '20 at 22:15

ZR-

1,6962 silver badges11 bronze badges

Qiskit: Add a standard gate to circuit from a string

Awarded Sep 10 '20 at 18:40

Wutend

233 bronze badges

Error associated with HTTPSConnectionPool

Awarded Sep 10 '20 at 14:21

Marcelo Jr.

111 bronze badge

What is the elementary gate set for ion-trap quantum computers?

Awarded Sep 8 '20 at 15:56

sotowa

712 bronze badges

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

Awarded Sep 8 '20 at 12:17

Markus Heinrich

1,1433 silver badges9 bronze badges

Getting an error running a program in IBM Q Experience Quantum lab

Awarded Sep 8 '20 at 10:17

parth

2416 bronze badges

Is the Haar measure invariant under conjugation?

Awarded Sep 7 '20 at 22:52

dmitryk

612 bronze badges

How to calculate distance of $k=0$ stabilizer code?

Awarded Sep 7 '20 at 18:40

s137

312 bronze badges

Prove that Shannon and von Neumann entropies satisfy $H(P)\ge S(\rho)$ with $P$ diagonal of $\rho$

Awarded Sep 6 '20 at 16:57

Woka

854 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 4 '20 at 20:35

user12910

1995 bronze badges

Command errored out with exit status 1 while installing the editable env for qiskit terra

Awarded Sep 4 '20 at 11:42

Winona

3494 bronze badges

What is meant by “local minimum” in QAOA?

Awarded Sep 3 '20 at 17:05

siddhi mali

533 bronze badges

What is the query complexity of the QUBO algorithm?

Awarded Sep 3 '20 at 8:26

Shen Zhuoran

312 bronze badges

How can I create an arbitrary superposition state of two qubits in Qiskit?

Awarded Sep 1 '20 at 11:20

Abbyss

513 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 30 '20 at 20:15

Discord Warrior

11 bronze badge

In $|x_1,…,x_n\rangle$, can the individual constituents be called qubits?

Awarded Aug 29 '20 at 2:26

gen

2151 silver badge4 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 27 '20 at 1:47

Inm

613 bronze badges

Optimization using Quantum Logics

Awarded Aug 26 '20 at 21:21

Mr.EU

1733 bronze badges

Optimize chains of single-qubit u1, u2, u3 gates by combining them into a single gate in Qikist

Awarded Aug 26 '20 at 19:21

Monica

1115 bronze badges

Number of Qubits Required for Simulation of Caffeine and Penicillin Molecules

Awarded Aug 26 '20 at 16:33

YerkoBits

72 bronze badges

Grover's 3-qubits tutorial: Why we need the last X gates

Awarded Aug 24 '20 at 16:27

Sourcerer

1215 bronze badges

Hadamard Test to calculate imaginary part

Awarded Aug 24 '20 at 7:20

Rahul Pratap Singh

212 bronze badges

Trouble importing Qiskit

Awarded Aug 23 '20 at 14:36

Krishnan Ganesh

11 bronze badge

Hadamard direct mapping of input to output in $\theta$ and $\varphi$ form

Awarded Aug 20 '20 at 10:28

vrpbkp

393 bronze badges

Terminology: what do $|i\rangle$ and $|\mbox{-}i\rangle$ represent?

Awarded Aug 17 '20 at 20:06

luciano

2,5525 silver badges25 bronze badges

What's the relation between the sign of error correction code and commute of operators?

Awarded Aug 17 '20 at 19:56

chrysaor4

6362 silver badges5 bronze badges

How to calculate distance of $k=0$ stabilizer code?

Awarded Aug 17 '20 at 0:11

unknown

2458 bronze badges

Existence of multiple job monitor in qiskit

Awarded Aug 12 '20 at 8:01

kita

884 bronze badges

Qiskit error on get_backend()

Awarded Aug 12 '20 at 7:18

Sagiruddin Mondal

1234 bronze badges

How to initialize a random state in Qiskit?

Awarded Aug 12 '20 at 0:51

immaryw

764 bronze badges

How to do state tomography when using sampling in Qiskit?

Awarded Aug 10 '20 at 11:36

Pierre

764 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 10 '20 at 8:06

fstawyug4i

11 bronze badge

What are known applications of quantum sampling?

Awarded Aug 10 '20 at 5:37

Heriotic

665 bronze badges

Alternative derivation of $P(\text{First qubit}=0)$ for the swap test

Awarded Aug 8 '20 at 13:31

Attila Kun

4091 silver badge8 bronze badges

Qiskit: Initializing $n$ qubits with binary values ($0$s and $1$s)

Awarded Aug 8 '20 at 7:36

kalyan

11 bronze badge

Why an element of SU(2) acts as a rotation for Majorana representation of states?

Awarded Aug 4 '20 at 18:57

Arsalan Motamedi

213 bronze badges

Making custom gate in Qiskit?

Awarded Aug 4 '20 at 6:51

Yixiong_chen

865 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 2 '20 at 6:41

thedumbkid

1577 bronze badges

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