Quantum Entanglement - Harvard Universityqpt.physics.harvard.edu/talks/hebrew.pdfThe quantum theory...
Transcript of Quantum Entanglement - Harvard Universityqpt.physics.harvard.edu/talks/hebrew.pdfThe quantum theory...
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Talk online at http://sachdev.physics.harvard.edu
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=1√2
(|↑↓〉 − |↓↑〉)
Quantum Entanglement
Hydrogen atom:
Hydrogen molecule:
= _
Superposition of two electron states leads to non-local
correlations between spins
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Change in the nature of
entanglement in a macroscopic
quantum system.
Quantum Phase Transition
Familiar phase transitions, such as water
boiling to steam, also involve macroscopic
changes, but in thermal motion
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The complex and non-local
entanglement at the critical point
between two quantum phases
Quantum Criticality
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1. Entanglement of spins Experiments on antiferromagnetic insulators
2. Black Hole Thermodynamics Connections to quantum criticality
3. Nernst effect in the cuprate superconductorsQuantum criticality and dyonic black holes
Outline
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1. Entanglement of spins Experiments on antiferromagnetic insulators
2. Black Hole Thermodynamics Connections to quantum criticality
3. Nernst effect in the cuprate superconductorsQuantum criticality and dyonic black holes
Outline
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The cuprate superconductors
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Antiferromagnetic (Neel) order in the insulator
No entanglement of spins
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Antiferromagnetic (Neel) order in the insulator
Excitations: 2 spin waves (Goldstone modes)
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Weaken some bonds to induce spin
entanglement in a new quantum phase
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Ground state is a product of pairs
of entangled spins.
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Excitations: 3 S=1 triplons
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Excitations: 3 S=1 triplons
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Excitations: 3 S=1 triplons
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Excitations: 3 S=1 triplons
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Excitations: 3 S=1 triplons
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Phase diagram as a function of the ratio ofexchange interactions, λ
λλc
Quantum critical point with non-local
entanglement in spin wavefunction
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TlCuCl3
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Phase diagram as a function of the ratio ofexchange interactions, λ
λλc
Pressure in TlCuCl3
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N. Cavadini, G. Heigold, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer
and H. Mutka, Phys. Rev. B 63 172414 (2001).
“triplon”
TlCuCl3 at ambient pressure
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Observation of 3 → 2 low energy modes, emergence of new longi-tudinal mode in Neel phase, and vanishing of Neel temperature atthe quantum critical point
Christian Ruegg, Bruce Normand, Masashige Matsumoto, Albert Furrer, Desmond McMorrow,
Karl Kramer, Hans–Ulrich Gudel, Severian Gvasaliya, Hannu Mutka, and Martin Boehm, preprint
TlCuCl3 with varying pressure
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Quantum phase transition with full square
lattice symmetry
H = J∑〈ij〉
�Si · �Sj ; �Si ⇒ spin operator with S = 1/2
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A. W. Sandvik, Phys. Rev. Lett. 98, 227202 (2007)
H = J∑〈ij〉
�Si · �Sj + K∑�
four spin exchange
Quantum phase transition with full square
lattice symmetry
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K/J
H = J∑〈ij〉
�Si · �Sj + K∑�
four spin exchange
Quantum phase transition with full square
lattice symmetry
A. W. Sandvik, Phys. Rev. Lett. 98, 227202 (2007)N. Read and S. Sachdev, Phys. Rev. Lett. 62, 1694 (1989).
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Why should we care about the
entanglement at an isolated critical
point in the parameter space ?
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Temperature, T
0K/J
Conformal field theory (CFT) at T>0
Neel VBS
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1. Entanglement of spins Experiments on antiferromagnetic insulators
2. Black Hole Thermodynamics Connections to quantum criticality
3. Nernst effect in the cuprate superconductorsQuantum criticality and dyonic black holes
Outline
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1. Entanglement of spins Experiments on antiferromagnetic insulators
2. Black Hole Thermodynamics Connections to quantum criticality
3. Nernst effect in the cuprate superconductorsQuantum criticality and dyonic black holes
Outline
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Objects so massive that light is
gravitationally bound to them.
Black Holes
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Horizon radius R =2GM
c2
Objects so massive that light is
gravitationally bound to them.
Black Holes
The region inside the black hole horizon is causally disconnected
from the rest of the universe.
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Black Hole Thermodynamics
Bekenstein and Hawking discovered astonishing connections between the Einstein theory of black
holes and the laws of thermodynamics
The Second Law: dA ≥ 0
Entropy of a black hole S =kBA
4�2Pwhere A is the area of the horizon, and
�P =
√G�
c3is the Planck length.
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Black Hole Thermodynamics
Bekenstein and Hawking discovered astonishing connections between the Einstein theory of black
holes and the laws of thermodynamics
Horizon temperature: 4πkBT =�
2
2M�2P
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AdS/CFT correspondence
The quantum theory of a black hole in a 3+1-dimensional negatively curved AdS universe is
holographically represented by a CFT (the theory of a quantum critical point) in 2+1 dimensions
A 2+1 dimensional
system at its quantum
critical point
Black hole
3+1 dimensional AdS space
Maldacena
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AdS/CFT correspondence
The quantum theory of a black hole in a 3+1-dimensional negatively curved AdS universe is
holographically represented by a CFT (the theory of a quantum critical point) in 2+1 dimensions
Quantum
criticality
in 2+1 DBlack hole
3+1 dimensional AdS space
Strominger, Vafa
Black hole
temperature =
temperature of
quantum
criticality
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AdS/CFT correspondence
The quantum theory of a black hole in a 3+1-dimensional negatively curved AdS universe is
holographically represented by a CFT (the theory of a quantum critical point) in 2+1 dimensions
Black hole
3+1 dimensional AdS space
Strominger, Vafa
Black hole entropy
= entropy of
quantum criticality
in 2+1 dimensions
Quantum
criticality
in 2+1 D
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AdS/CFT correspondence
The quantum theory of a black hole in a 3+1-dimensional negatively curved AdS universe is
holographically represented by a CFT (the theory of a quantum critical point) in 2+1 dimensions
Black hole
3+1 dimensional AdS space
Maldacena
Dynamics of
quantum criticality
= waves in curved
gravitational
backgroundQuantum
criticality
in 2+1 D
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AdS/CFT correspondence
The quantum theory of a black hole in a 3+1-dimensional negatively curved AdS universe is
holographically represented by a CFT (the theory of a quantum critical point) in 2+1 dimensions
Black hole
3+1 dimensional AdS space
Son
“Friction” of
quantum critical
dynamics = black
hole absorption
ratesQuantum
criticality
in 2+1 D
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1. Entanglement of spins Experiments on antiferromagnetic insulators
2. Black Hole Thermodynamics Connections to quantum criticality
3. Nernst effect in the cuprate superconductorsQuantum criticality and dyonic black holes
Outline
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1. Entanglement of spins Experiments on antiferromagnetic insulators
2. Black Hole Thermodynamics Connections to quantum criticality
3. Nernst effect in the cuprate superconductorsQuantum criticality and dyonic black holes
Outline
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Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
Dope the antiferomagnets with charge carriers of density x by applying a chemical potential μ
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T
μSuperconductor
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T
μSuperconductor
Scanning tunnelling microscopy
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Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
STM studies of the underdoped superconductor
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12 nm
Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
Y. Kohsaka et al. Science 315, 1380 (2007)
Topograph
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Intense Tunneling-Asymmetry (TA)
variation are highly similar
dI/dV Spectra
Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
Y. Kohsaka et al. Science 315, 1380 (2007)
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12 nm
Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
Y. Kohsaka et al. Science 315, 1380 (2007)
Topograph
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12 nm
Tunneling Asymmetry (TA)-map at E=150meV
Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
Y. Kohsaka et al. Science 315, 1380 (2007)
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12 nm
Tunneling Asymmetry (TA)-map at E=150meV
Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
Y. Kohsaka et al. Science 315, 1380 (2007)
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12 nm
Tunneling Asymmetry (TA)-map at E=150meV
Ca1.90Na0.10CuO2Cl2
Bi2.2Sr1.8Ca0.8Dy0.2Cu2Oy
Y. Kohsaka et al. Science 315, 1380 (2007)
Indistinguishable bond-centered TA contrast
with disperse 4a0-wide nanodomains
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Ca1.88Na0.12CuO2Cl2, 4 KR map (150 mV)
4a0
12 nm
TA Contrast is at oxygen site (Cu-O-Cu bond-centered)
Y. Kohsaka et al. Science 315, 1380 (2007)
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Ca1.88Na0.12CuO2Cl2, 4 KR map (150 mV)
4a0
12 nm
TA Contrast is at oxygen site (Cu-O-Cu bond-centered)
S. Sachdev and N. Read, Int. J. Mod. Phys. B 5, 219 (1991).M. Vojta and S. Sachdev, Phys. Rev. Lett. 83, 3916 (1999).
Evidence for a predicted valence bond supersolid
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T
μSuperconductor
Scanning tunnelling microscopy
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T
g
μSuperconductor
Insulator x =1/8
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T
g
μSuperconductor
Insulator x =1/8
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T
g
μSuperconductor
Insulator x =1/8
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T
g
μSuperconductor
Insulator x =1/8
Nernst measurements
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Nernst experiment
H
ey
Hm
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T
g
μSuperconductor
Insulator x =1/8
Nernst measurements
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Superfluid VBS Insulator
Non-zero temperature phase diagram
Coulomb interactions
VBS Supersolid
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Superfluid VBS Insulator
Non-zero temperature phase diagram
Coulomb interactions
VBS Supersolid
Quantum-critical
dynamics of vortices
in a magnetic field,
at generic density,
and with impurities
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To the CFT of the quantum critical point, we add
• A chemical potential μ
• A magnetic field B
After the AdS/CFT mapping, we obtain the Einstein-Maxwell theory of a black hole with
• An electric charge
• A magnetic charge
A precise correspondence is found between general
hydrodynamics of vortices near quantum critical points
and solvable models of black holes with electric and
magnetic charges
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B (2007)
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S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
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Conservation laws/equations of motion
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
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Constitutive relations which follow from Lorentz transformation to moving frame
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
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Single dissipative term allowed by requirement of positive entropy production. There is only one
independent transport co-efficient
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
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S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
Momentum relaxation from impurities
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LSCO - Theory
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B (2007)
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LSCO - Experiments
N. P. Ong et al.
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Only input parameters Output
LSCO - Theory
�v = 47 meV Aτimp ≈ 10−12 s
ωc = 6.2GHz · B
1T
(35KT
)3
Similar to velocity estimates by A.V. Balatsky and Z-X. Shen, Science 284, 1137 (1999).
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B (2007)
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To the CFT of the quantum critical point, we add
• A chemical potential μ
• A magnetic field B
After the AdS/CFT mapping, we obtain the Einstein-Maxwell theory of a black hole with
• An electric charge
• A magnetic charge
A precise correspondence is found between general
hydrodynamics of vortices near quantum critical points
and solvable models of black holes with electric and
magnetic charges
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B (2007)
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