Leti Devices Workshop | Silvano De Franceschi| December 4, 2016

QUANTUM PROSPECTS FOR BEYOND MOORE

| 2Leti Devices Workshop | Silvano De Franceschi | December 4, 2016

• Quantum Superposition

• Quantum Entanglement

UNEXPLOITED QUANTUM PHYSICS

| 3Leti Devices Workshop | Silvano De Franceschi | December 4, 2016

• Classical Computer with Binary Logic

• Quantum Computer

EXPONENTIAL QUANTUM COMPLEXITY

Classical bit: 0,1N-bit state: single combination of N bits (e.g. 01001…01)

ψ ⟩ = a0 ⟩ + b 1 ⟩Single qubit state:

ψ ⟩ = a00 ⟩ + b10 ⟩ + c01 ⟩ + d11⟩2-qubit state:

N-qubit state defined by 2N complex numbers

ψ ⟩ = a000 ⟩ + b100 ⟩ + c010 ⟩ + …3-qubit state:….

Naturally built-in parallelism

| 4Leti Devices Workshop | Silvano De Franceschi | December 4, 2016

• Quantum Internet• To ensure safe data transfer

• Quantum Simulators• To predict material properties, chemical compounds and reactions,…• Applications to many different areas (fertilizers, energy,…)

• DO NOT REQUIRE FULL CONTROL OF EACH QUBIT• CAN BE USEFUL ALREADY WITH SMALL (~100) NUMBERS OF QUBITS

• Universal Quantum Computers• Optimization tasks• Database searching• Machine learning

• REQUIRE LARGE NUMBERS (~106) OF INDIVIDUALLY CONTROLLED QUBITS

QUANTUM TECHNOLOGIES

[Further reading: http://qurope.eu/manifesto]

| 5Leti Devices Workshop | Silvano De Franceschi | December 4, 2016

TURNING TRANSISTORS INTO QUBITS

silicon qubit(prototype)

scalable quantum processor

Leveraging FDSOI technology

10 nm BOX

Si

gate

• Back-gate control• Corner-state confinement• 3D stacking (CoolCubeTM)

| 6Leti Devices Workshop | Nom Prénom | December 4, 2016

QUANTUM SILICON @ GRENOBLE

| 7Leti Devices Workshop | Silvano De Franceschi | December 4, 2016

FIRST QUBIT ISSUED FROM FAB LINE

source drain

gate 1

gate 2200 nm

spin qubit readout spin

• Compact Design• Qubit-Based on Hole Spin

• All-electrical control• Lower hyperfine coupling• No valley degeneracy

Maurand et al., Nature Comm. (2016)

| 8Leti Devices Workshop | Silvano De Franceschi | December 4, 2016

FIRST QUBIT ISSUED FROM FAB LINE

spin qubit readout spin

• Electrically Induced Rabi Oscillations

-3.90x10-12

-3.80

-3.70

-3.60

Cur

rent

(A

)

4003002001000 τBurst (nS)

| 9Leti Devices Workshop | Silvano De Franceschi | December 4, 2016

• First Target: Linear Qubit Array

• Step-up: 2D Qubit Architectures

TOWARDS A SCALABLE QUANTUM PROCESSOR

Leti, technology research instituteCommissariat à l’énergie atomique et aux énergies alternativesMinatec Campus | 17 rue des Martyrs | 38054 Grenoble Cedex | Francewww.leti.fr