Quantum Computing Stack Exchange
Quantum Computing Stack Exchange

Questions tagged [simulation]

For questions about simulating either quantum computers or simulating things on quantum computers.

355 questions
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Can a Turing machine simulate a quantum computer?

I know that a Turing machine1 can theoretically simulate "anything", but I don't know whether it could simulate something as fundamentally different as a quantum-based computer. Are there any attempts to do this, or has anybody proved it…
user7
11
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2 answers

Why does (almost) every pair of Hamiltonians generate, through repeated commutation, the whole space of Hermitian matrices?

In [1], the problem of simulating a Hamiltonian using repeated applications of a different set of Hamiltonians is discussed. In particular, let $A$ and $B$ be a pair of Hermitian operators, and let $\mathcal L$ be the algebra generated from $A, B$…
glS
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Anti-symmetrization on the lattice

Assume, I'm using a system of qubits to simulate a fermionic system. If I'm using the second-quantized formalism (e.g. orbitals in quantum chemistry), the anti-symmetric nature of the fermionic wave functions can be taken into account by means of…
mavzolej
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What are some good quantum computing simulator and visualiser?

I am looking for some good software to simulate quantum computing, visually if possible. I know about quirk (http://algassert.com/quirk) and IBM Q Experience (https://quantumexperience.ng.bluemix.net) I just saw this question ( Does conditional gate…
Adrien Nivaggioli
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What is the current research status in simulating many-particle systems from first principles?

There is a huge gap between basic physical laws and predicting many particle systems from first principles. It will be so amazing if we can predict most properties of many particle systems (from mass of an atomic nuleus to density/conductivy/bandgap…
jw_
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Which QC platform is better to use on HPC cluster?

I have a HPC (High Performance Computing) cluster with NVIDIA GPU and Xeon CPU partitions. Is this simulator list complete? Which do you recommended to use on a HPC cluster? Will it increase the performance (it has 512GB of memory).
0x90
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How many qubits are simulable with a normal computer and freely accessible simulators?

I want to simulate an arbitrary isolated quantum circuit acting on $n$ qubits (i.e. a pure state of $n$ qubits). As I know RAM is the bottleneck for quantum simulators, you can consider a "normal" computer to have between $4$ and $8$ Gio of RAM, all…
Adrien Suau
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Quantum Codes and Plasma Codes for Simulation Applications

I am wondering if anyone in here has heard/read is involved in quantum codes applied to simulate plasmas? I have read that PPNL is working on that but have not actually seen/found any of their papers on the subject. Thank you!
Enrique Segura
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What is the non-recursive form of the sum-over-paths simulation algorithm?

In my previous question on this, I managed to come up with a simple recursive algorithm for the sum-over-paths method. However, what other snatches of material I can find online don't use recursion when explaining it. I've tried to come up with a…
ahelwer
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How is a quantum simulator able to simulate a quantum mechanical properties on a classical computer?

I'm confused as to how a classical computer can simulate quantum mechanical properties through the use of classical bits. Why do we need quantum computers if a quantum simulator can do it's job on a classical computer?
Sinestro 38
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Clasically-simulable MBQC pattern for a BQP computation

I'm looking for an example of an MBQC pattern which performs a BQP computation and ideally has been used in research before. The pattern should be classically simulable (i.e. containing in the region of 10-15 qubits) -- this is so I can demonstrate…
T.H
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How to manipulate the phase of the electromagnetic radiation in the Hamiltonian

The papers describing the Honeywell trapped ion quantum computer say that rotations of the qubit about an axis in the xy plane of the Bloch sphere are accomplished by applying a slightly detuned pair of lasers whose "beat" frequency matches the…
Anna Naden
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Simulation of large quantum circuits or available dataset

I need to obtain the expectation value of an observable (I do not care which one) of simulated large quantum circuits, like 30 or more qubits. The quantum circuit can be of any type, but it is important that it isn't one of those easy to simulate…
stopper
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Is there a state vector simulator written in pure python?

For educational purposes, I am looking for a simulator written in pure python. It may use scientific-python libraries such as numpy to exploit the data structures they provide, but the core algorithms should be written on top of these libraries.
Abdullah Khalid
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Is it Possible to Get Results as a List Instead of a Histogram

Title says it all. Essentially, I just want to be able to get my outputs as a procedural list, [1,0,0,1,1,1,0,0,...] as opposed to the usual histogram. I'm still learning my way around IBM Quantum's but I would appreciate help figuring out if this…
YaGoi Root
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