- Inspired by nature, building on spin - Christiane Timmel
- Aleks Kissinger - Quantum computing meets computer science
- Quantum chemistry in the era of quantum computers - David Tew
- Dorian Gangloff
- Dominic O’Brien - Engineering quantum technologies
- Peter Leek - superconducting quantum technology
- David Lucas - Ion trap technologies
- Quantum Matter - Experimental Frontiers - Seamus Davis
Inspired by nature, building on spin - Christiane Timmel
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hypothesis: magneto sensitive radical pairs are formed in light sensitive proteins, aka crypto chromes
- controlling psin in molecular wires
- controlling and quantifying spin localisation and delocalisation by design, synthesis and EPR
- can change geometry of system as well
- quantum interference in molecular rings
- cut the rings up to select electron pathways
- the exchang ealong two paths is the same as the exchange along 4 single paths
- Oxford is world leading in the understanding of cryptochorms and there importance in bird migration.
Aleks Kissinger - Quantum computing meets computer science
- seen before on the IBM workshop day
Quantum chemistry in the era of quantum computers - David Tew
- in silicon prediction - solve the schordinger equation of the nuclei as well as you can so you and understand the phenomena
Dorian Gangloff
- used my figure,
Dominic O’Brien - Engineering quantum technologies
- short range indoor links: polarisation based quantum schemes
- symmetric encryption key
- Challenges of quantum key distribution in free space:
- daylight swamps the signal,
- wavelengths in quiet regions
- tricky to get these links secure
- people can do it between satellites, but the key rates are really slow
- daylight swamps the signal,
- Hardware: MEMS mirror based beam streaming
- Entaglement QKDs
- David Lucas, Ion traps
- Dynamic optics and photonics groups
- use lasers to for fabrication inside transparent materials
- want to minimise cross talk between fabricated wave guides.
- write single NV centres in diamond, using direct fluorescent feedback for high yield and positioning accuracy
- Can build in stress fields.
- what do people what to use quantum key distribution for - QKD offers a level of security to post quantum digital algorithms. Commercial world see as part of the whole quantum security picture.
Peter Leek - superconducting quantum technology
- how do we build a quantum computer out of electric circuits as we know them
- LC resonators, don’t want resistors as they are associated with information loss
- physics of them is a mass on a spring
- need a macroscopic quantum ground state and low dissipation high q circuits for quantum coherence
- superconductors
- good microwave engineering
- reduce dissipation
- get very close to the ground state - remove thermal excitations
- kT < hw
- high frequencies and low T (10mK)
- kT < hw
- LC resonators, don’t want resistors as they are associated with information loss
- linear resonator and equally spaced levels are not a qubit
- by using josephson junction we can create a effective non-linear resonator which creates unequally spaced levels
- tillable low cross-talk 3d-integrated superconducting circuits
- operate at microwave frequencies, as you scale up your chip the box your chip is in also operates modes at microwave frequencies - need to short circuits across the volume to fix this and maintain coherence.
- 16 qubits, want to operate at 4 9s fidelity 99.99%
- Scaling challenge: we can convince themselves they can get to a certain scale (1000) in a fridge, then you need microwave to microwave optical conversion between fridges.
David Lucas - Ion trap technologies
- atom ion in a trap is a mass on spring, in megahertz regime.
- DIQKD challenge, need high number of Bell pairs and high fidelity.
- quantum networking experimental setup
- optical clocks
Quantum Matter - Experimental Frontiers - Seamus Davis
- bosons and fermions
- Bosons: swap you don’t change the sign by minus 1
- Fermions: you do change the sign
- Refrigerate bosons —> collapse into a single quantum state —> bose-einstein quantum state
- Refrigerate fermions —> they pair up –> superconductivity
Correlated electron metal - Consider the Coulomb interaction within the metals and you find that the structure changes (MOTT) / HUND correlated metals