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A QRAC encodes $n$ bits in $m$ qubits so that one of the bits can be retrieved. Let $p>0.5$ be the success probability of the receiver correctly obtaining any one of the $n$ bits of their choice by pe…
I'm using Qiskit 1.0.0. I'm trying to define a custom gate from a certain wavefunction and insert it in a quantum circuit that I want to run and measure the counts. The relevant code for the question …
I would like to ask about the need of a low temperature for the operation of superconducting qubits. I know a superconducting qubit is made from basically a LC circuit and Josephson junction. So obvio…
I want to understand in some detail why superconducting qubits need periodic calibration. The usual, hand wavy explanation is environmental effects that tend to vary. However, I suspect that the actua…
This question may be slightly opinion based, so I apologise if this is the incorrect place to ask. My question is, is there any use for Shor's integer factorisation algorithm other than for breaking p…
Basis is for this post ist the paper https://arxiv.org/pdf/1902.00445.pdf I want to do something similar using graph data encoded in quantum states. The circuit structure should look like this (first …
On qiskit, I have defined a QUBO, called qp as follows: print(qp.prettyprint()) Minimize -1.7324559764718837*x10^2 + 0.00619189721450626*x10*x11 ... + 3.6972673229589947*x27*x29 - 32.42658793825545*x2…
I read about single-shot error correction using 3D gauge color codes. I saw the claim that it enables significant qubit and time overhead improvement regarding 2D surface codes, since it does not requ…
Suppose that we have this kind of circuit where the first unitary operator U is used for the state preparation while the Hadamard operator is used of state detection. Let's say we try to run this circ…
Define the single qubit Clifford hierarchy recursively by $ \mathcal{C}^1:=<iX,iZ> $ (the determinaint 1 subgroup of the Pauli group) as well as $$ \mathcal{C}^k:=\{ V \in \mathsf{SU}(2): VpV^{-1} \te…
I have read Fujitsu's white paper for a brief introduction to their device: http://marketing.us.fujitsu.com/rs/407-MTR-501/images/quantum-inspired-computing.pdf As far as I know, Fujitsu's hardware is…
What is the need to apply the Hadamard gate as the first step while designing the diffuser circuit in the implementation of Grover's algorithm? I know what the gate does but I cannot understand what s…
I wasn't quite sure where to post this as I don't know if this is a Qiskit specific thing or not, but I'm not sure how to interpret this result I got from running a simulation. from result.data(): {'c…
I want to use historical data for 5 stocks from YahooFinance and then calculate mean vector and covariance matrices, so I can optimize them with QAOA. Anyone know what is wrong with this code: num_ass…
One of the key features of quantum error correction that makes it different from classical error correction. When code is non-degenerate, an error $E$ takes codewords to different words. codewords. Fo…
I am trying to calculate the ground state energy of some simple molecules using 'MolecularGroundStateEnergy' tools in qiskit. When I run the calculations for very small molecules (e.g. H2, HeH+) the j…
I am currently simulating some quantum circuits, and want to calculate the probabilities of observing each individual state. I am able to use Cirq for this, and calculate it using $P_{00} = |\alpha|^2…
I have recently listened to a talk on quantum computing and was fascinated to learn about IBM Q Experience. Between the explanations in the User Guide and in Nielsen's book, I came to the following qu…
This is because if control qubit is in arbitrary state then how can it be made to control the CNOT gate? What is the interface between Control Qubit and CNOT Gate?
While writing this answer I realized it would be really helpful if I could show the OP a video or .gif of how qubit states in Bloch spheres transform under certain unitary operations. I googled up a b…
What tools exist for creating quantum circuit diagrams and exporting them as images? Preferably one which runs in Windows, or even better one which runs in the web browser.
The standard way to implement a reversible XOR gate is by means of a controlled-NOT gate or CNOT; this is the "standard quantum XOR operation". Physics.Stackexchange Is there a "standard quantum XNOR …
Grover's search algorithm provides a provable quadratic speed-up for unsorted database search. The algorithm is usually expressed by the following quantum circuit: In most representations, a crucial p…
Quantum Computing Inc. and Ciena Partner for Quantum-Secured Optical Networking at OFC 2026 Quantum Computing Report