# Questions tagged [landauers-principle]

The tag has no usage guidance.

23 questions
Filter by
Sorted by
Tagged with
71 views

### Landauer limit - cost to avoid changing a bit already equal to desired value

If I have a bit and I do not know what the current value is, is it possible to use less energy than $E_b = k_b T \ln(2)$ so that if the bit value is already equal to what you want, you don't waste ...
• 137
103 views

### Landauer's principle debunked?! "Information entropy and thermal entropy: apples and oranges"

I was asking a question about sustainability of reversible computers against entropy. I referenced Landauer's principle to frame my question and someone told me in the comments that Landauer's ...
129 views

### "Information Catastrophe" and measuring density of planets?

In the article https://arxiv.org/pdf/2009.01937.pdf the term "Information catastrophe" is explained. Suppose the later proposed experiment by this author https://aip.scitation.org/doi/10....
1 vote
75 views

### Is the value $k \ln 2$ the largest or the smallest entropy that a single particle can carry? [closed]

Sorry, but I lost the reference of the author telling this. Is $k \ln 2$ the largest or the smallest entropy that a single particle can carry? And why is this so? EDIT: It was a paper from the 1970s.
• 727
74 views

### Is Landauer’s principle an approximation?

According to Wikipedia, Landauer’s principle follows from the second law of thermodynamics. However, the second law of thermodynamics is an approximation: there is an extremely small probability that ...
• 1,440
144 views

### Landauer's Extended Principle

Melvin Vopson proposed the mass/energy/information equivalence principle in 2019. In the foundations of this idea, Landauer's principle has a significant place. Vopson uses what he calls Landauer's ...
• 171
351 views

### How practical is the Landauer limit to actual computing (including distant future)?

Landauer's Principle is often presented as a fundamental limit of efficiency for classical computing. It states that in order to erase one bit of information, at least the following amount of heat has ...
• 321
1k views

### Does creating information cost energy of itself (sorry layman question) [closed]

Say I wanted to heat a room with either resistors or cpus mining bitcoin, if I give either the same watts, will they both produce the same watts into heating the room ? (obviously the cpus ...
• 103
1 vote
190 views

### Maxwell's demon - Landauer's principle and it's incompatibility with the 1st law of thermodynamics

Let's recapitulate and state both the Maxwell's demon and the official most-widely accepted solution to the paradox, namely Landauer's principle: The Maxwell demon paradox: A demon just by observing ...
• 13
1 vote
185 views

### Current and conductance from the Landauer formula

The Landauer formula for a one dimensional quantum system (potential step scattering) can be written as $$I(V)=\frac{2e}{h}\int_{-\infty}^\infty dE T(E) (f_S(E) - f_D(E)),$$ where $T(E)$ is the ...
• 793
216 views

### Is any energy converted to information when taking a photograph?

I am curious about the relationship between energy and information. I have only a beginner's knowledge, having read Shannon's original paper and a little about Landauer's limit which states that the ...
1 vote
111 views

### What is the area of physics/science called that deals with fundamental limits of computation?

I am interested in learning about the fundamental limits of computation and in particular would like to read textbooks on the subject if they exist. My background is in maths and computer science - I ...
91 views

### Is it necessary to assume that equivalent microstates cannot get transformed into inequivalent microstates to derive the Landauer principle?

The Landauer erasure principle states that to erase a bit of information from a system, the entropy of the environment will be increased by at least $k_B\log2$, or equivalently, it costs at least an ...
• 9,304
94 views

### Is this a counterexample to Landauer's principle?

Landauer's principle states that if I have a physical system with two possible states, and that system begins in an unknown state, then putting the system into a known state takes the addition of at ...
• 1,395
1k views

### Foundation of Landauer's principle [duplicate]

I have asked this on CS subsite but since there was no reply yet and the question is also somewhat related to physics, I think it will be appropriate to post here as well. Landauer's principle states ...
• 163
222 views

### Landauers Principle Derivation

I read about Landauer's principle and was wondering about the implications from it's original derivation. Landauer derived his principle straight foward from the second law, but I see people favoring ...
105 views

### Is there a trade-off between computation speed and heat creation in relation to the Landauer Limit?

In this article, an experiment is referenced in which information was converted into energy via erasure. It is said that the slower the erasure took place, the less energy was released, and that the ...
• 445
12k views

### If we had a "perfectly efficient" computer and all the energy in the Milky-way available, what number could it count to?

The idea for this question comes from an example in cryptography, where supposedly 256-bit symmetric keys will be enough for all time to come (brute-forcing a 256-bit key is sort-of equivalent to ...
• 1,069
391 views

### Is the Landauer limit reversible

As I understand it, the Landauer limit, $kTln(2)$, is the minimum amount of energy to erase a bit. Is it also the minimum amount to create a bit? I'm asking statistical, like Avogadro's number of ...
6k views

### Is there a thermodynamic limit on how efficiently you can solve a Rubik's cube?

Suppose I build a machine which will be given Rubik's cubes that have been scrambled to one of the $\sim 2^{65}$ possible positions of the cube, chosen uniformly at random. Is it possible for the ...
• 53.2k
2k views

### How does Landauer's Principle apply in quantum (and generally reversible) computing

I understand that a reversible computer does not dissipate heat through the Landauer's principle whilst running - the memory state at all times is a bijective function of the state at any other time. ...
• 88.5k
1 vote
166 views

### Landauer's principle vs Rayleigh–Jeans law

Can we argue based on Landauer's principle that if one bit information is changed inside a blackbody, the total radiated energy should be at least or in order of $kT\ln2$? If it is so, can we also ...
• 422