Questions tagged [resource-request]

For questions that involve a request for resources to learn anything related to quantum computing or quantum information.

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What is the original paper introducing the Variational Quantum Eigensolver?

My question is very simple. I am looking for original paper where Variational Quantum Eigensolver (VQE) has been introduced. After some Googling I was able to find many applications of VQE and its ...
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2 votes
1 answer
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Exponential advantage with Hadamard test

My question is the following: Let's assume that the only algorithm a quantum computer would be able to implement is the Hadamard test, which circuit is represented below, would we say that compared to ...
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2 votes
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Recommendation for Efficient Lindblad Simulator Packages

Could anyone recommend some efficiently established packages to simulate Lindblad dynamics? I wrote some codes using numpy to solve the vectorized superoperator equation but it's rather slow. Update: ...
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Can ancilla-based parity measurements be used to detect errors in NISQ algorithms?

Measuring stabilizer eigenvalues is a fundamental part of quantum error correction. However, I was wondering if the idea of measuring a stabilizer using an ancilla could be useful in other contexts as ...
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State Initialization of quantum circuit

I am trying to understand how to initialize a quantum circuit with classical input. By browsing on the internet, I came to the conclusion that there are some fixed circuits which can be used to ...
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5 votes
1 answer
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Review on quantum resources required in mixed-state quantum computing

I am trying to see which features we know are necessary for mixed-state quantum computing to avoid the algorithms being efficiently simulated on classical computers. In the case of pure-state quantum ...
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2 votes
1 answer
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Good review articles on microwave hardware for superconducting qubit quantum computing?

I am trying to find some review articles on the microwave hardware used in superconducting qubit quantum computing. So far, most papers that I found seem to be high level overviews, e.g., Multilayer ...
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2 votes
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Is there a resource theory of irreversibility?

We know that we can quantify the degree of irreversibility of a quantum process using the entropy production rate of the same process. But sometimes it seems that the very fact that information has ...
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Equivalence of Topological Quantum Computing and the Quantum Circuit Model

It is my understanding that topological quantum computers are capable of executing an arbitrary quantum circuit with a polynomial overhead of translating the circuit to the native topological ...
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Paper on geometry of 2-level Quantum states influenced by noise

Are there papers discussing geometry of quantum states (especially two level systems) influenced by noise.
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Is there a way to compute how many hidden variables are needed to describe a given local state?

Consider a bipartite state $\rho$ that is local. By local I mean here that there is a local hidden variable model explaining the correlations resulting from measuring $\rho$. In other words, $\rho$ ...
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3 votes
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Quantum Machine Learning Masters thesis topics [closed]

I'm a prefinal year Physics Masters student looking to pursue my thesis in the domain of Quantum computing, particularly in the areas of Quantum Simulation or Quantum Machine Learning (theory/...
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1 answer
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What are some references discussing the generation of quantum circuits with genetic algorithms?

I have recently saw that quantum circuits can be generated using genetic algorithms. These are called as Evolvable quantum hardware. Please provide me some links of good papers or books related on ...
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What is the complexity of hidden subgroup problems?

It is often stated that some of the "hidden subgroup problems" can be efficiently solved by quantum computers if the group is abelian, while no efficient algorithm is known for the non-...
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6 votes
1 answer
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Why do we need to keep of history of $d$ cycle for surface code in order to resist against data *and* measurement errors

I am trying to understand why we need to keep in memory $d$ clock cycles in order to correct efficiently for the surface code where the syndrome qubits are also faulty ($d$ is the code distance). [...
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Solutions available to "An introduction to Quantum Computing"?

I wanted to work through an introductionary text on quantum computing and came across "An introduction to Quantum Computing" by Kaye, Laflamme and Mosca. The text seems fine but there are no ...
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2 votes
1 answer
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Universal quantum computation by Clifford gates plus magic state

In the paper Universal quantum computation with ideal Clifford gates and noisy ancillas, it is claimed that a circuit composed by Clifford gates, plus a so-called "magic state", can perform ...
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3 votes
3 answers
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State of the art logical gate implementations for surface code

I am currently learning surface code. In this framework, we can either do a quantum memory (for which we have good knowledge of how to do it), but we can also "in principle" perform an ...
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Looking for detailed comparisons between photonic vs other quantum hardware

I’m looking for resources or literature that compares photonic devices and other quantum computing hardware using some performance metric. In other words, I am looking for grounds that compare the ...
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1 vote
2 answers
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Reference for surface code error correction

I am reading surface code theory with this paper. The paper is great but there are some parts of the explanations for which I am struggling to understand. In such cases, another source is always nice ...
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5 votes
1 answer
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Should one learn the math of quantum computing from a "pure" perspective, or are quantum computing texts "good enough"? [duplicate]

Math for quantum computing includes advanced linear algebra, functional analysis, group and representation theory, probability theory, and more. There are plenty of pure math books out there for those,...
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5 votes
1 answer
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Complexity of a distribution of measurement of output of quantum circuit

The Kolmogorov complexity of a string refers to a deterministic object. Here, I refer to the analogous "complexity of a distribution", or better, to the complexity of sampling from a ...
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5 votes
1 answer
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Can entangled photons create entanglement in material particles?

Is it possible that two entangled photons when absorbed by two material particles, say two atoms, lead to the entanglement of these atoms? Is there any published research on this topic?
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What are the getting-started-resources for quantum finance? [closed]

What are suitable books, websites or learning material you can advice to get started with quantum finance?
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How is quantum metrology realized in experiment?

Are there some lists of the method to realize quantum metrology, or rather, utilizing quantum resources to enhance the precision of parameter estimation. The experimental method I've know is listed as ...
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9 votes
2 answers
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Review paper on depth, qubits and $T$ gates number on Clifford+T decomposition for various "typical" algorithms

My question I am looking for some review paper, or a list of different papers providing concrete numbers about the depth, number of qubits and number of $T$ gates required on the Clifford+T basis for ...
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2 votes
2 answers
63 views

Optimal decompositions of some standard multi-qubit gates

To have a concrete example in mind: 3-qubit Toffoli gate can be decomposed into 6 $CNOT$s as shown here I believe this is the most economic decomposition in terms of the number of $CNOT$s used. My ...
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3 votes
1 answer
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What are the problems of linear inversion quantum state tomography?

Consider the following general formulation of the standard quantum state tomography problem: given an unknown state $\rho$, a set of (known) observables $\{\mathcal O_k\}_k$ (generally the elements of ...
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2 votes
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Major Security proofs available for Device-Independent QKD

I've lately started working on a DI-QKD project. I've started looking into Vazirani and Vidick's PRL paper on Device-Independent QKD security proof. It's proving to be quite time-consuming for me to ...
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6 votes
1 answer
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Resources for QRAM implemented as a subroutine for quantum algorithm

I am currently working on a project on a higher version of amplitude amplification and for that we want to store the initial state (which will be some sort of superposition) into a QRAM. Now we want ...
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2 votes
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What are the evidences that quantum simulation have a future?

Here future means orders of improvement which can solve rather different problems e.g. emergent phenomenon. For example, the first integrated logic only have several transistors, now it have billions ...
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4 votes
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What are introductory resources to learn about quantum computing hardware?

I am interested in learning some details of quantum computers inner working, what are the limitation etc. in order to understand quantum computation more. Can some one refer me to some good materials ...
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1 answer
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References about deriving the complexity of a given algorithm

Trying to learn about how to derive (& intuition) the complexity for a given algorithm as shown below. If there is any good reference or starting point that anyone can suggest that will be highly ...
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6 votes
1 answer
59 views

Do individual qubits on IBM quantum processors share the same control unit?

I want to investigate the maximum possible parallelism of quantum operations on a specific IBM device (such as the latest heavy-hex architecture), which requires a basic knowledge of their control ...
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1 answer
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Pros/cons of the different schemes to have complete fault-tolerant gatesets

I am interested to have references and comment about pro/cons of the various methods that are used to implement complete gateset in a fault tolerant manner. Usually the Clifford operations have a ...
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5 votes
1 answer
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Good references to learn magic state distillation for fault tolerance

I need to learn magic state distillation procedure and their application to fault-tolerance. One of the original paper on this subject is the following: https://arxiv.org/pdf/quant-ph/0403025.pdf I am ...
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4 votes
1 answer
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Resources for QML hackathon/textbook types of questions

I'm looking for a list of resources (links, videos, lectures, etc.) that contains quantum machine learning problems. These could be of the style of problem sets, hackathon questions, questions from a ...
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2 votes
0 answers
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Example of lower bound on spectral gap for adiabatic quantum computing

is there a list of reference for which the authors prove a lower bound of the spectral gap for an adiabatic quantum algorithm? I.e. I am searching for examples where the authors solve a problem with ...
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0 votes
1 answer
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How to get information about 'qubit location' or 'variable of qubit location' in qiskit docs?

I have something problem with using qiskit. I searched several qiskit docs to get 'qubit location' or 'variables' that represent qubit. I searched three documents below. ...
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3 votes
1 answer
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What are QHT, QWT and QFT?

I am new to quantum computing. I am not able to understand QHT, QWT and QFT. I tried searching for a suitable material but still could not find them. It would be great if someone can explain and also ...
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2 votes
1 answer
71 views

Comparing technical limitations of major quantum computing approaches

As far as I know, major quantum computing approaches include superconducting qubits, trapped ions, nuclear magnetic resonance qubits, and free space quantum optics. I guess two main technical ...
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4 votes
2 answers
102 views

Are all computational resources reducible to the time resource?

It's well known that in most (if not all?) computations you can trade time and space resources. An extreme example might be creating an infinitely large lookup table of all composites produced from ...
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3 votes
3 answers
285 views

Is every single-qubit unitary just a rotation around some unit vector on the Bloch sphere?

I remember reading this somewhere... Is there an elegant proof for this?
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2 votes
0 answers
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How to start reading quantum computing papers?

What's the best way to get to a state where you can read quantum computing papers? I find them too dense and full of notation to approach. I am currently working my way through Nielsen and Chuang's ...
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1 vote
0 answers
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Where can we find Qiskit exercises solution/answers?

Where can we find Qiskit Exercises solution/answers, is there any website for it? Or any alternative way to check our answer/solution?
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5 votes
0 answers
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Quantum annealing - studies showing empirical evidence for better performance in comparison with classical computers

Currently, it is not known wheter quantum anneling or algorithms like VQE and QAOA for general purpose quantum computers bring about any increase in computational power. However, there are some ...
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5 votes
1 answer
107 views

Paper references on how quantum algorithms have an impact on cryptography?

Could you please help me in finding some research paper references on the impact of Quantum algorithms on symmetric and asymmetric cryptography ? Also, I request if I can get some references or notes ...
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5 votes
0 answers
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Is there recent research on experimental implementations of Grover's algorithm with more than 5 qubits?

I could only find experimental work on Grover's algorithm upto 5 qubits here. Is there any more recent research for larger database sizes where Grover's algorithm is employed? Is there any known ...
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5 votes
1 answer
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How do the extra energy levels of a transmon qubit affect computation/fidelity?

I was reading about transmon qubits, and I know that they are not true two-level systems. Are there any math/papers which talk about how those extra energy levels affect the computation? I'm assuming ...
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What are some standard ways to visualize non-unitary processes

In quantum computing, quantum circuits are a common model for visualizing unitary evolution. If I want to represent a unitary $U$ acting on a $2$-qubit state $|00\rangle$ followed by a measurement in ...
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