Blog
Quotes That Resonated With Me
Physics
“The first principle is that you must not fool yourself and you are the easiest person to fool.” — Richard Feynman
“Unforeseen surprises are the rule in science, not the exception. Remember: Stuff happens.” — Leonard Susskind
“An expert is a person who has made all the mistakes that can be made in a very narrow field.” — Niels Bohr
“Science is what we have learned about how to keep from fooling ourselves.” — David Deutsch
“Unthinking respect for authority is the greatest enemy of truth.” — Kip Thorne
“The world keeps happening, in accordance with its rules; it’s up to us to make sense of it and give it value.” — Sean Carroll
Precision Measurement
“What we observe is not nature itself, but nature exposed to our method of questioning.” — Werner Heisenberg
“Never measure anything but frequency” — Arthur Schawlow
“God made the bulk; the surface was invented by the devil.” — Wolfgang Pauli
“Never mind big scientific pictures or theory framework, a serious experimental measurement is what we can contribute to science in the most meaningful way.” — Jeff Kimble
“For me, the field of light, of lasers, of atoms, molecules, has been an unending series of surprises, and I can’t think of a better field” — Theodor Hänsch
Articles
Theory vs Technology
During my PhD in quantum optics, I found myself in an unusual position: I was a physicist by training, but I was based in an electrical engineering department. That meant I was never quite claimed by either side. My friends in theoretical physics thought my work was “too applied.” My engineering colleagues thought it was “too science-y.” I seemed to exist in a disciplinary no-man’s-land.
The irony was that my field was considered exciting enough to appear in top-tier journals, yet its significance was often difficult to explain to people unwilling to step outside their intellectual corners. That experience stayed with me because it revealed something larger than my own situation: science is full of people talking past one another.
Over the past 15 years, ever since I first became seriously interested in the natural sciences, I have seen this pattern again and again. Specialists do not merely misunderstand one another; but also look down on one another.
The stereotypes are familiar.
The theorist says to the experimentalist: all you do is count electrons on a screen.
The experimentalist fires back: all you do is write science fiction; none of your ideas are realistic.
Physicists dismiss engineers: you do not understand science.
Engineers respond: none of your ideas work outside the lab.
And the pattern extends far beyond those labels. Researchers who work on “fundamental” problems can look down on applied work, while those building systems can treat foundational research as self-indulgent. The labels change, but the instinct remains the same: differences in role become judgments about worth.
Professor Ronald Walsworth (distinguished physicist and a pioneering expert in quantum sensing and precision measurement) touched on this matter when he appeared on the 632nm podcast, The Surprising Power of NV Centers. Reflecting on the status of theory in physics today, he remarked:
“Nowadays, people in physics don’t take most theorists as seriously. In hindsight, we lionize theorists of the past. And it is not that theorists aren’t serious people, it is just their calculations usually don’t bring as much merit or weight in most cases compared to well-done experiments.”
To be fair, some of these remarks are made in the spirit of friendly rivalry. Science has always had its tribes, and teasing across boundaries is not new. But what is striking is how often such comments are not playful at all. They are meant to diminish other people’s work.
Specialization in modern academia is unavoidable. But specialization can easily harden into identity, and identity into arrogance: my field is more important, my field is purer. Even the way science is presented to the public reinforces this divide. Grand theories often receive the prestige, while the painstaking work of testing, building, refining, and engineering is treated as secondary.
Yet science does not actually advance along a single lane. It advances through a loop. Theory proposes structures, principles, and constraints. Experiment determines what survives contact with reality. Engineering transforms fragile concepts into reliable, controllable systems that, in turn, create new possibilities for both experiment and theory. The convergence of these three elements yields truly remarkable results.
Professor Peter Zoller (pioneer of quantum computing, quantum simulation and quantum communication) described this dynamic beautifully on the 632nm podcast episode The Quantum Revolution. Speaking as a theorist who has worked closely with experimentalists, he said:
“I am really amazed by what can be done experimentally and by the power of experimentalists, but of course when you talk to them about some of these theoretical ideas they immediately come up with a lot of complaints on why this is hard to do. But if they want to do something and there must be motivation behind it, they are able to do miracles.”
I have witnessed this interplay firsthand. I have also heard many examples from my friend and colleague Alezzi, who shared with me story after story of theory and experiment pushing one another forward. Those successes deserve an article of their own.
Unfortunately, I have also seen the opposite.
I have seen experiments carried out, results analyzed in detail, conclusions drawn, and even manuscripts nearly finished before theory enters the picture only as decoration. At that point, a model is added simply because it matches the data and makes the paper look more sophisticated. I have heard principal investigators describe this quite bluntly: the paper can be made “nicer” with a few decorative equations.
That mentality reveals a shallow idea of collaboration. In that model, experimental papers are polished by adding theoretical formalism after the fact, while theory-heavy papers are made more “realistic” by sprinkling in speculative experimental relevance. Everyone gains another publication, but the collaboration itself remains theatric. The work may look interdisciplinary on paper while lacking the intellectual exchange that makes interdisciplinary science meaningful.
It would be depressing to end the article on that note, especially when there are so many better examples: cases where theory, experiment, and engineering worked together and delivered remarkable results.
The transistor
William Shockley captured this spirit well:“Frequently, I have been asked if an experiment I have planned is pure or applied research; to me it is more important to know if the experiment will yield new and probably enduring knowledge about nature.”
Quantum cascade lasers
A striking example of how fundamental physics and engineering creativity can become inseparable in practice.“A mixture of pure physics and engineering that could as easily lead to a fresh theoretical insight as to a new technology.”
Quantum Cascade Lasers
Federico Capasso: The Quantum DesignerAtomic clocks
Jun Ye summarized this beautifully:“This work is a demonstration of precise experimental control and theoretical understanding of atomic interaction in optical lattice clocks to an unprecedented level. It is also a testimony to the power of experiment-theory collaboration.”
LIGO
Reflecting on the detection of gravitational waves, Kip Thorne said:“LIGO is the triumph of a thousand people, the superb experimental team. I think my biggest contribution was to understand where they had to go because I am a theorist and I knew about how strong the waves were. I understand how they interact with the detector… There is no way I could do any of that (the engineering), but I could also convey to the funding agencies… my faith in the experimental team.”
The real issue, then, is not that theory, experiment, and technology are in competition. The problem is our repeated insistence on arranging them into a prestige ladder. A mature scientific culture would recognize these roles as complementary forms of rigor, each with its own standards of excellence and each with its own ways of failing. The most exciting progress often happens at the interfaces. And the people who thrive there are usually not the ones most committed to defending their corner, but the ones humble enough to learn another language.