A collection of my most cited research papers, and a selection of my books.
Geometric quantum computation using nuclear magnetic resonance
A significant development in computing has been the discovery 1 that the computational power of quantum computers exceeds that of…
Optomechanical entanglement between a movable mirror and a cavity field
We show how stationary entanglement between an optical cavity field mode and a macroscopic vibrating mirror can be generated by…
Perturbative quantum simulation
Approximations based on perturbation theory are the basis for most of the quantitative predictions of quantum mechanics, whether in quantum…
Indefinite Causal Orders from Superpositions in Time
Treating the time of an event as a quantum variable, we derive a scheme in which superpositions in time are…
Refrigeration with Indefinite Causal Orders on a Cloud Quantum Computer
We demonstrate non-classical cooling on the IBMq cloud quantum computer. We implement a recently proposed refrigeration protocol which relies upon…
How Much of Mathematics is Really Just Physics?
I’d like to dedicate this short piece to my late friend Prof. Peter T. Landsberg, who was a “thermodynamicist” (this is how he liked to call himself). I used to meet him at the Athenaeum, in the good old days when smoking cigars was still allowed indoors.
Absolute zero is the lowest temperature but is there an upper limit?
There are a number of arguments as to why there should be an upper bound on the value of temperature. The simplest is that temperature is related to energy (via Boltzmann’s constant). So if we believe that the energy in the universe is finite (a reasonable supposition), then that gives us the highest temperature.
The World Exists Only When No One is Looking
One particular misconception that is ever-present is captured by the statement that quantum physics suggests that “the moon is not there when nobody looks”. This is a riff on the old musings of Bishop Berkeley who asked whether a tree falling in the forest makes a sound if there is no one there to hear it.
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