The same goes for the transistor. It was first developed to amplify radio signals, and you had transistor radios that replaced the vacuum tubes that were being used. Now they are also used as logic elements, 1s and 0s. If you apply a voltage to a transistor you can basically open or close a gate and allow electrons to flow through or make it very difficult for electrons to flow. And so you have two different current states, high and low, that you can call a 1 or a 0.
You can combine them in clever ways to do logic operations with the 1s and 0s. You can encode information. You can develop a language of the 1s and 0s and manipulate them that way. And again, I don't think that was the first thought of the people that developed the transistor. Look at all the things that it has brought out. There are probably more transistors in a standard hospital than there are stars in the Milky Way Galaxy, when you think about all the computers and all the electronic devices that we use just for medical applications.
So it really has transformed life in a very profound way. The real superheroes of science are a small handful of people who knew they were changing physics, but I don't think they recognized that they were also changing the future. One of the ways you keep this book lively and accessible is to use anecdotes from early science fiction.
How well have those predictions held up? The main problem is that they believed that there was going to be a revolution in energy, which would lead to jet packs, death rays and flying cars.
But what we got was a revolution in information. This information age, of course, came about because of semiconductors and solid-state physics, which were enabled by quantum mechanics. A lot of these things go back to transistors and semiconductors.
Is that in your view the biggest fundamental leap that quantum mechanics allowed us to make? More than that, even. By discerning what were the fundamental rules that govern how atoms interact with each other and how they interact with light, you also have now a fundamental understanding of chemistry.
There is a really deep appreciation for why the world is the way it is. Can you imagine living in a world before quantum mechanics? Such quantum powers are completely foreign to us, yet are the basis of emerging technologies such as ultra-secure quantum cryptography and ultra-powerful quantum computing. But as to what it all means, no one knows. In all this, there are several elephants in the room.
Meanwhile cosmological measurements indicate that over 95 per cent of the universe consists of dark matter and dark energy , stuffs for which we currently have no explanation within the standard model , and conundrums such as the extent of the role of quantum physics in the messy workings of life remain unexplained. The world is at some level quantum — but whether quantum physics is the last word about the world remains an open question.
Clocks synchronize our technological world, keeping things like stock markets and GPS systems in line. Today, the most precise clocks in the world, atomic clocks , are able to use principles of quantum theory to measure time. They monitor the specific radiation frequency needed to make electrons jump between energy levels. The quantum-logic clock at the U. And the NIST strontium clock, unveiled earlier this year , will be that accurate for 5 billion years—longer than the current age of the Earth.
Such super-sensitive atomic clocks help with GPS navigation, telecommunications and surveying. The precision of atomic clocks relies partially on the number of atoms used. Kept in a vacuum chamber, each atom independently measures time and keeps an eye on the random local differences between itself and its neighbors. If scientists cram times more atoms into an atomic clock, it becomes 10 times more precise—but there is a limit on how many atoms you can squeeze in.
Entangled atoms would not be preoccupied with local differences and would instead solely measure the passage of time, effectively bringing them together as a single pendulum.
That means adding times more atoms into an entangled clock would make it times more precise. Entangled clocks could even be linked to form a worldwide network that would measure time independent of location. Traditional cryptography works using keys: A sender uses one key to encode information, and a recipient uses another to decode the message.
This can be fixed using potentially unbreakable quantum key distribution QKD. In QKD, information about the key is sent via photons that have been randomly polarized. Quantum Physics in association and electron microscopy have improved the imaging of biological samples. Moreover, in differential interference contrast microscopy, a pattern of interference is created by the beam of photons, which is then analysed. All-in-one, with Quantum Physics, microscopy has improved to a great extent, and, therefore, a large amount of information from a sample can be obtained.
Navigating to unknown locations has never been easier as it has been with the aid of Quantum Physics. While using a mobile phone for navigation, the GPS receiver in the phone is responsible for picking up the signal from multiple clocks.
The distance and time between your current location and the destination are calculated by calculating different arrival times from different satellites. Moreover, even the distance from your current location from each satellite is also calculated.
Each satellite is equipped with an atomic clock, which relies on Quantum Physics only. Magnetic Resonance Imaging, also known as Nuclear Magnetic Resonance, involves the reversal of the spins of the electrons in hydrogen nuclei. So, basically, we are talking of shift in energies; which is nothing but one of the applications of Quantum Physics. The study of soft tissues can easily be carried out with the use of MRI. Thanks to Quantum Physics that the diagnosis and treatment of some life-threatening ailments have been possible.
Communication has been made extremely easy because of the important role of Quantum Physics. Fibre optic telecommunication has made possible two-way and quick communication.
The fibre optic telecommunication is possible only because of lasers, which are devices of Quantum Physics. Prev Article Next Article.
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