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Questions tagged [interpretations]

For questions about interpretations of quantum mechanics, e.g. Copenhagen, many-worlds, etc.

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Interpretation of a circuit that yields the same result for initializations $|+\rangle$ and $|-\rangle$

How can I interpret a quantum circuit that results in the same state for the initialization $\newcommand{\ket}[1]{|#1\rangle}\newcommand{\bra}[1]{\langle #1|}\ket{+}$ and $\ket{-}$? For example, the ...
upe's user avatar
  • 269
0 votes
1 answer
493 views

What is the reason of $ZZ$- and $XX$- interaction in two-qubit system?

In two-qubit system there are $ZZ$- and $XX$-interaction between the qubits, in some papers it is described how to remove such parasitic interactions, but I didn't find the reason of why does it ...
Curious's user avatar
  • 259
4 votes
0 answers
140 views

With only one qubit, where does the bomb tester get its improvement over what's achievable classically?

The Elitzur-Vaidman [EV] bomb tester, first described in 1993, is a wonderful "pre-Shor's algorithm" application of quantum information. The original paper is written in the language of ...
Mark Spinelli's user avatar
4 votes
2 answers
352 views

How similar is the recent (2021) tardigrade experiment to a Schrödinger's cat experiment?

In a recent paper on the arXiv, a team of researchers from Singapore and elsewhere claim to have established entanglement between a superconducting qubit and a tardigrade (or water-bear), which is a ...
Mark Spinelli's user avatar
2 votes
0 answers
77 views

Do the Heisenberg uncertainty principle and quantum decoherence relate in some way?

Up until now I assumed (in simple words) that a qubit collapses because of the heisenberg uncertainty principle, meaning that we can not measure a qubit without changing it state. But now I've read ...
Blubsiwubsi's user avatar
8 votes
1 answer
338 views

What are tentpole topics in quantum computing?

Lots of beginners are starting to learn quantum computing. But there are also experienced people that have been working in this field for many years. What are some topics that might be considered ...
user27286's user avatar
  • 965
6 votes
2 answers
282 views

How can quantum interference happen in real world if a wave function does not have any physical meaning?

I understood quantum interference as a heart of quantum computing, because it enables two possibilities to cancel each other. Quantum algorithms utilize this property to reduce the probability of ...
suhdonghwi's user avatar
5 votes
2 answers
414 views

What is the "sum-over-paths" picture of quantum computing?

In chapter 9 of Scott Aaronson's book Quantum Computing Since Democritus (see online progenitor lecture notes here), he introduces a strange (to me) conceptualization of applying two Hadamard-like ...
ahelwer's user avatar
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1 vote
1 answer
74 views

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

A qubit is a quantum system in which the Boolean states 0 and 1 are rep- resented by a prescribed pair of normalised and mutually orthogonal quantum states labeled as ${|0⟩, |1⟩}$ According to [1]. ...
gen's user avatar
  • 244
6 votes
5 answers
663 views

Does a classical computer really require $2^n$ complex numbers to represent the state of $n$ qubit quantum computer?

One often reads that the key reason why classical computers (probabilistic or deterministic) are unable to simulate quantum algorithms such as Simon's or Shor's efficiently is that a classical ...
QC-Novice's user avatar
  • 121
6 votes
3 answers
637 views

Does Planck's constant have any role in quantum computing?

I am new to the area of quantum computing, but as I study it I can't help wonder about the role of the Planck's constant. When one studies quantum mechanics one often finds statements that quantum ...
QC-Novice's user avatar
  • 121
2 votes
1 answer
238 views

Interpretations of quantum computing power [closed]

Over the years I encountered different explanations of quantum computing advantage over classical computers. But I am not sure which explanations are in fact valid and which are not. Quantum ...
Anixx's user avatar
  • 137
35 votes
4 answers
10k views

Effects of quantum computing on parallel universes

I have heard a few times that one way of describing quantum computers is that they essentially use the computing power of their counterparts in alternate realities that they access through ...
Snowshard's user avatar
  • 479
3 votes
1 answer
345 views

Does the Copenhagen interpretation (+ "quasi-classical measuring apparatus") allow one to bypass a derivation's objection?

Background I previously asked this question, in which I'm trying to better understand this joshphysics's derivation of an interpretation of the time-energy uncertainty principle. And the gist of ...
More Anonymous's user avatar
5 votes
2 answers
605 views

Many-Worlds Interpretation and GHZ States

I'm working through a problem set, and I've come across the following problem: In this problem, you'll explore something that we said in class about the Many-Worlds Interpretation of quantum ...
Joe's user avatar
  • 257
9 votes
1 answer
299 views

Simulating a system inside a system

The minimum size of a computer that could simulate the universe would be the universe itself. This is quite a pretty big theory in classical computing and physics because to contain the information ...
Yuzuriha Inori's user avatar