Thread by @fgrosshans

Now Yasunobu Nakamura from on the “Macroscopic quantum machines” ERATO project jst.go.jp/erato/nakamura…
#LTQI

YAsunobu Nakamura will focus on Integrated quantum circuits because of time constraints.
He investigates information quantum thermodynamics in the quantum domain, at a small scale. Fault-tolerant quantum computers look a lot like perpetual quantum machines.

#LTQI

Yasunobu Nakamura: a superconducting qubit is a nonlinear resonator. The non-equidistant energy levels allow to use the two lowest levels as a qubit
#LTQI

Yasunobu Nakamura : There is a lot of efforts worldwide to integrate superconducting qubits.
He is working on a 8×8= 64 qubits 20×20 mm² chips. He also works on 2D arrays of 3D cavities containing “batmons”
#LTQI

Yasunobu Nakamura has achieved 70 µs coherence time, but works on improving it.
He multiplexes the readout.
But also, the classical electronics truned out to be harder to develop than the quantum part !
#LTQI

Yasunobu Nakamura does quantum microwave quantum optics, in circuit QED. E.g. he demonstrated quantim nondemolition (QND) detection of microwave photons #LTQI

Yasunobu Nakamura also looks at hybrid systems, coupling microwaves to plamsons, magnons (in ferro magnetic materials) or phonons (in quantum nanomechanical systems)
#LTQI