20130911 idc hpc_geordie_rose_final

The D-Wave Two

Dr. Geordie Rose Founder and CTO, D-Wave 2:00PM September 11th 2013 @ IDC HPC User Forum, Boston, MA

Image from http://www.nas.nasa.gov/quantum/quantumcomp.html

What I’m going to talk about

1. What we are doing (& why) 2. The machines 3. What the machines do

2 © Copyright 2013 D-Wave Systems Inc.

Quantum computation … will be the first technology that allows useful tasks to be

performed in collaboration between parallel universes.

David Deutsch @ TED 2005

Image from http://conferences.ted.com/TEDGlobal2010/program/ 3 © Copyright 2013 D-Wave Systems Inc.

… quantum computers … can solve problems whose solution will never be feasible on a conventional computer. Quantum computing for everyone Michael Nielsen (2008) http://michaelnielsen.org/blog/quantum-computing-for-everyone/

Image from http://www.longexposure.ca/2011/03/tedx-waterloo-the-uncharted/ 4 © Copyright 2013 D-Wave Systems Inc.

II. The machines



Footprint

• ~ 200 square feet

• Closed cycle fridge

• Consumes ~ 15 kW


Processor environment

• 168 lines from room temperature to processor

• 10 kg of metal at 20 milliKelvin

• 1 nanoTesla in 3D across processor; 50,000x less than earth’s magnetic field

2.725 K 8 © Copyright 2013 D-Wave Systems Inc.


What is a quantum computer

•dfd


Fabrication cross-section

© Copyright 2011 D-Wave Systems Inc.

BASE

WIRA

WIRB

WIRC

Resistor

VIA

SiO2

SiO2 WIRD

WIRE

Junction


One of very few processes in the world capable of fabricating VLSI superconducting processors

The evolution of an idea

Processor evolution overview available at http://www.youtube.com/watch?v=6VIAL8gQRTI 12 © Copyright 2013 D-Wave Systems Inc.

442 qubits

509 qubits

III. What the machines do



Program real numbers on a graph, draw samples



sk [-1, +1]



sk [-1, +1]

𝒔 = +𝟏, −𝟏, +𝟏, +𝟏, −𝟏, +𝟏, −𝟏, −𝟏


Program real numbers on a graph

h1

J15



N

j

ji

Eji

ijjjN ssJshss1 ,

1 ,,

h1

J15

sk [-1, +1]



N

j

ji

Eji

ijjjN ssJshss1 ,

1 ,,

h1

J15

sk [-1, +1]

Ising model AKA

QUBO AKA

Weighted Max2SAT


A simple example

3

1

321 ,,j

ji

ji

ijjj ssJshsss

h J h1= +1.0 J12= - 1.0

h2= - 1.0 J13= - 0.5

h3= 0 J23= +0.3

h1

h2 h3

J12

J13

J23

s1

s2 s3


s1 s2 s3

-1 -1 -1 -1.2

-1 -1 +1 -0.8

-1 +1 -1 -1.8

-1 +1 +1 -0.2

+1 -1 -1 3.8

+1 -1 +1 2.2

+1 +1 -1 -0.8

+1 +1 +1 -1.2

Notation: +1 = , -1 =

3

1

321 ,,j

ji

ji

ijjj ssJshsss



N

j

ji

Eji

ijjjN ssJshss1 ,

1 ,,

h1

J15

sk [-1, +1]

TsZ

sP /exp1


TsZ

sP /exp1


Programmable processor devices Two types: qubits and couplers

s1 s5

h1 h5

J15


Machine language programming

N

j

ji

Eji

ijjjN ssJshss1 ,

1 ,,

Optimization Hardware

Variables sj = ±1 Qubits jz

Linear terms hj Qubit biases hj

Quadratic terms Jij Coupler biases Jij

Allowed edge set E Locations of couplers between qubits

Objective function values (s1,…,sN) Allowed energy eigenvalues E

1 ,

Nz z z

P j j ij i j

j i j E

H h J

Quantum annealing Start with all qubits in superposition


s3 s2 s4 s1

s7 s6 s8 s5

All 28 states equally

likely


Quantum annealing Turn down superposition, turn up {h, J}


Vesuvius SR10-V6 500 qubits, 1,472 couplers


Duty cycle for Vesuvius

Step 1. Program {h, J} into hardware • About 50ms

Step 2. Quantum anneal • About 20 microseconds

Step 3. Measure qubits (draw a sample) • About 100 microseconds

Step 4. Repeat 2-3 to gather N samples

~ 50 ms for 1 sample, ~ 1.2 s for 10,000 samples


A quantum Boltzmann-like machine Program real numbers on a graph, draw samples

N

j

ji

Eji

ijjjN ssJshss1 ,

1 ,,

h1

J15

sk [-1, +1]

TsZ

sP /exp1


There’s a fascinating hypothesis that a lot of human perception … can be explained by a single learning algorithm. Unsupervised Feature Learning and Deep Learning Andrew Ng (2011) http://www.youtube.com/watch?v=I56UugZ_8DI

Image from http://coursera.com

[email protected]



s3 s2 s4 s1

s7 s6 s8 s5

s3 s2 s4 s1

s7 s6 s8 s5

20130911 idc hpc_geordie_rose_final

Technology

dwave systems

j j i j e h h j

j ji ji ijjj ssjshsss

graph n j ji eji ijjjn

n z z z p j j ij

graph h1 j15

machine program real

n samples