Richard Feynman Caltech Course 198384 Potentialities and Limitations of Computing Machines N ature isnt classical dammit and if you want to make a simulation of nature youd better make it quantum ID: 476635
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Slide1
Quantum is Different, Part 1Slide2
Richard Feynman Slide3
Caltech Course 1983-84:
Potentialities and Limitations of Computing Machines
“N
ature
isn't classical, dammit, and if you want to make a simulation of nature, you'd better make it quantum mechanical.”Slide4
Persistent current in a
superconducting circuit
Magnetic field of
a single electron
Polarization of
a
single photon
Internal state of
a
single atomSlide5
Quantum entanglement
Nearly all
the information in a
typical entangled “quantum book”
is encoded in the correlations among the
“pages”.
Y
ou
can't access
the information
if you read the book one page at a time.
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….
….Slide6
To describe
300
quantum bits (e.g., atoms),
we would need more numbers than the number of atoms in the visible universe!Slide7
Quantum Supremacy!
???Slide8
David
Wineland
Krysta
SvoreSlide9
Quantum is Different, Part 2Slide10
Richard Feynman Slide11Slide12Slide13
Credit card fraud is a distant memory --- your quantum card can be validated, but it can’t be copied. Slide14
Noninvasive quantum sensors, imaging the human brain at the molecular scale, illuminate the foundations of consciousness. Slide15
Optical space telescopes, by sharing quantum entanglement, observe an alien on another planet.Slide16
Highly efficient solar panels exploiting quantum coherence
power the earth. Slide17
The world's leading physicists, who have played quantum games since age 3, cannot understand why 20th century physicists thought quantum mechanics is weird. Slide18
A quantum computer can simulate efficiently any physical process that occurs in Nature.
(Maybe. We don’t actually know for sure.)
p
article collision
e
ntangled electrons
m
olecular chemistry
b
lack hole
e
arly universe
superconductorSlide19
( + )
Decoherence
Environment
( + )Slide20
Environment
Decoherence
ERROR!
To avoid errors,
we must prevent the environment from “learning” about the state of the quantum computer during the computation.
Quantum
ComputerSlide21
Quantum error correction
The protected “logical” quantum information is encoded in a highly entangled state of many physical
qubits
.
The environment
can't access
this information
if
it interacts locally with the protected system.
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….
….
EnvironmentSlide22
Kitaev’s
magic trick: sawing an
electron in half!Slide23Slide24
Holographic Principle
All information inside the room is encoded,
in a scrambled form, on the boundary of the room.Slide25
Holographic Principle
This scrambled encoding may be a quantum error-correcting code. The emergent space inside the
room is robust against errors on the walls of the room.Slide26
Holographic Principle
Quantum entanglement
holds space together.Slide27
D
eep insights into the quantum structure of spacetime
arise from laboratory experiments studying highly entangled quantum systems. . Slide28