🗊Презентация Quantum computers, quantum computations

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Слайды и текст этой презентации

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Quantum computers, quantum computations H. Gomonay National Technical University of Ukraine JGU, Mainz, Germany
Описание слайда:
Quantum computers, quantum computations H. Gomonay National Technical University of Ukraine JGU, Mainz, Germany

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Take-home message The quest for a quantum computer reminds me of the endless quests for WIMPs, strings, sparticles, magnetic monopoles, etc. Succeed they or not, they bring to development of new knowledges and technologies, push the most talented people into science and keep fun from research. Same as it ever was.
Описание слайда:
Take-home message The quest for a quantum computer reminds me of the endless quests for WIMPs, strings, sparticles, magnetic monopoles, etc. Succeed they or not, they bring to development of new knowledges and technologies, push the most talented people into science and keep fun from research. Same as it ever was.

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Motivation
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Motivation

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Outline History Principles of quantum computation Di Vincenzo criteria Superconducting qubit Some algorithms Architecture Challenges and problems
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Outline History Principles of quantum computation Di Vincenzo criteria Superconducting qubit Some algorithms Architecture Challenges and problems

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History in facts
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History in facts

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Quantum computers, quantum computations, слайд №6
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History in diagrams
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History in diagrams

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What is beyond?
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What is beyond?

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Quantum Mechanics: Quantum Information
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Quantum Mechanics: Quantum Information

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What is all about or new applications of quantum physics
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What is all about or new applications of quantum physics

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What is QC?
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What is QC?

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Classical  Quantum
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Classical  Quantum

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Algorithm complexity Easy
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Algorithm complexity Easy

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Qubit = Quantum bit
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Qubit = Quantum bit

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Entangled states (EPR)
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Entangled states (EPR)

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Interference – Schrödinger's Cat
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Interference – Schrödinger's Cat

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Quantum parallelelism
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Quantum parallelelism

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Parallel quantum algorithm
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Parallel quantum algorithm

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Universal gate set Operation Gates: NOT Hadamar XOR
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Universal gate set Operation Gates: NOT Hadamar XOR

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Principles of quantum computation
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Principles of quantum computation

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Di Vincenzo criteria Selectivity (addressing each qubit) High sensitivity = Good control Large decoherence time (decoh/ gate >104) Readout  Measurability Scalability (>100 qubits)
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Di Vincenzo criteria Selectivity (addressing each qubit) High sensitivity = Good control Large decoherence time (decoh/ gate >104) Readout  Measurability Scalability (>100 qubits)

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Quantum computer by Cirac & Zoller (1995)
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Quantum computer by Cirac & Zoller (1995)

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Ions in trap
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Ions in trap

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Qubit: micro or macro? Measurement duration: Limitations: Energy splitting: Qubit = 1 electron spin: Measured Min splitting Min field Impossible! We need macrospin!
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Qubit: micro or macro? Measurement duration: Limitations: Energy splitting: Qubit = 1 electron spin: Measured Min splitting Min field Impossible! We need macrospin!

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Superconductors: macroatoms Qubit: charge or phase Control: magnetic flux Readout: SQUID, SET T=10 mK 1 qubit gate — ns Qubit size 1 mcm
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Superconductors: macroatoms Qubit: charge or phase Control: magnetic flux Readout: SQUID, SET T=10 mK 1 qubit gate — ns Qubit size 1 mcm

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Superconducting qubit: overcoming decoherence
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Superconducting qubit: overcoming decoherence

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Flux qubit: theory
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Flux qubit: theory

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… & experiment
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… & experiment

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V-I SQUID (V.Shnyrkov, G. Tsoi, 1990)
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V-I SQUID (V.Shnyrkov, G. Tsoi, 1990)

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Quantum coherence
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Quantum coherence

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Single-qubit gate
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Single-qubit gate

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Rabi oscillations
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Rabi oscillations

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2-qubit gate (DiVincenzo et al, IBM qubit)
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2-qubit gate (DiVincenzo et al, IBM qubit)

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Find the period: Shor’s algorithm
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Find the period: Shor’s algorithm

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Hidden symmetry
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Hidden symmetry

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Database search Classic algorithm : 2n =N Quantum algorithm: 2n/2 = N Unsorted database Merlin
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Database search Classic algorithm : 2n =N Quantum algorithm: 2n/2 = N Unsorted database Merlin

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Grover’ algorithm Input Flip (Merlin) Mirroring
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Grover’ algorithm Input Flip (Merlin) Mirroring

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Grover’ algorithm: experiment
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Grover’ algorithm: experiment

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Architecture
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Architecture

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Quantum computer: challenges Decoherence (state instability) Scaling (few number of qubits) Input-output control Extreme conditions (T=10 mK, …) New math algorithms development Consumer friendly implementation Weak measurement
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Quantum computer: challenges Decoherence (state instability) Scaling (few number of qubits) Input-output control Extreme conditions (T=10 mK, …) New math algorithms development Consumer friendly implementation Weak measurement

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Quantum abyss
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Quantum abyss

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When, Where, Who & hoW? 2 qb — 1999, 7 qb — 2001, 16 qb — 2007, NP — 2012,1000 qb —2015, on-table -- 20xx? ~ 1000 experimental groups over the world Physics, math, computer science, engineering? Semi- or super-conductors or?
Описание слайда:
When, Where, Who & hoW? 2 qb — 1999, 7 qb — 2001, 16 qb — 2007, NP — 2012,1000 qb —2015, on-table -- 20xx? ~ 1000 experimental groups over the world Physics, math, computer science, engineering? Semi- or super-conductors or?

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Alumni
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Alumni

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QUANTUM COMPUTING JOIN THE TEAM!
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QUANTUM COMPUTING JOIN THE TEAM!

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