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43 papers · 1 filter
Relaxation to Negative Temperatures in Double Domain Systems
Yusuke Hama, William J. Munro, Kae Nemoto
We investigate the relaxation of two collective spins in double domain system, which are individually coupled to a single bosonic reservoir, by varying the total number of spins in…
Broadband reconfigurable logic gates in phonon waveguides
Daiki Hatanaka, Tom Darras, Imran Mahboob +2
The high-quality-factor mechanical resonator in electromechanical systems has facilitated dynamic control of phonons via parametric nonlinear processes and paved the development of…
Continuous-wave operation and 10-Gb/s direct modulation of InAsP/InP sub-wavelength nanowire laser on silicon photonic crystal
Masato Takiguchi, Atsushi Yokoo, Kengo Nozaki +6
We demonstrated sub-wavelength (~111 nm diameter) single nanowire (NW) continuous wave (CW) lasers on silicon photonic crystal in the telecom-band with direct modulation at 10 Gb/s…
Characteristic spectra of circuit quantum electrodynamics systems from the ultrastrong- to the deep-strong-coupling regime
Fumiki Yoshihara, Tomoko Fuse, Sahel Ashhab +3
We report on spectra of circuit-quantum-electrodynamics (QED) systems in an intermediate regime that lies between the ultrastrong and deep-strong-coupling regimes, which have been…
Magnetic field sensing with quantum error detection under the effect of energy relaxation
Yuichiro Matsuzaki, Simon Benjamin
A solid state spin is an attractive system with which to realize an ultra-sensitive magnetic field sensor. A spin superposition state will acquire a phase induced by the target fie…
Superradiance with an ensemble of superconducting flux qubits
Neill Lambert, Yuichiro Matsuzaki, Kosuke Kakuyanagi +3
Superconducting flux qubits are a promising candidate for realizing quantum information processing and quantum simulations. Such devices behave like artificial atoms, with the adva…