87 citations · 361 across the 14 of their papers we have counts for
14 papers
Quantum-hardware spectral co-design framework for multifrequency Rydberg electrometry
Song Huang, Guibin Tian, Fernando Quijandría +4
Engineering electromagnetic hardware to satisfy discrete quantum-defined spectral constraints constitutes a general spectral co-design problem for quantum systems. Here we address…
Universal control of a bosonic mode via drive-activated native cubic interactions
Axel M. Eriksson, Théo Sépulcre, Mikael Kervinen +9
Linear bosonic modes offer a hardware-efficient alternative for quantum information processing but require access to some nonlinearity for universal control. The lack of nonlineari…
Fast generation of Schrödinger cat states in a Kerr-tunable superconducting resonator
X. L. He, Yong Lu, D. Q. Bao +7
Schrödinger cat states, quantum superpositions of macroscopically distinct classical states, are an important resource for quantum communication, quantum metrology and quantum comp…
Microwave amplification via interfering multi-photon processes in a half-waveguide quantum electrodynamics system
Fahad Aziz, Kuan Ting Lin, Ping Yi Wen +15
We investigate the amplification of a microwave probe signal by a superconducting artificial atom, a transmon, strongly coupled to the end of a one-dimensional semi-infinite transm…
Resolving Fock states near the Kerr-free point of a superconducting resonator
Yong Lu, Marina Kudra, Timo Hillmann +4
We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement). Such a device possesses a sweet spot in which the ext…
Transmon qubit readout fidelity at the threshold for quantum error correction without a quantum-limited amplifier
Liangyu Chen, Hang-Xi Li, Yong Lu +17
High-fidelity and rapid readout of a qubit state is key to quantum computing and communication, and it is a prerequisite for quantum error correction. We present a readout scheme f…
Nonequilibrium heat transport and work with a single artificial atom coupled to a waveguide: emission without external driving
Yong Lu, Neill Lambert, Anton Frisk Kockum +5
We observe the continuous emission of photons into a waveguide from a superconducting qubit without the application of an external drive. To explain this observation, we build a tw…
Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
Yong Lu, Andreas Bengtsson, Jonathan J. Burnett +7
We demonstrate an on-demand source of microwave single photons with 71--99\% intrinsic quantum efficiency. The source is narrowband (300\unite{kHz}) and tuneable over a 600 MHz ran…
Propagating Wigner-Negative States Generated from the Steady-State Emission of a Superconducting Qubit
Yong Lu, Ingrid Strandberg, Fernando Quijandría +3
We experimentally demonstrate the steady-state generation of propagating Wigner-negative states from a continuously driven superconducting qubit. We reconstruct the Wigner function…
Deterministic loading and phase shaping of microwaves onto a single artificial atom
W. -J. Lin, Y. Lu, P. Y. Wen +12
Loading quantum information deterministically onto a quantum node is an important step towards a quantum network. Here, we demonstrate that coherent-state microwave photons, with a…
Collective radiation from distant emitters
Kanu Sinha, Alejandro González-Tudela, Yong Lu +1
Waveguides allow for direct coupling of emitters separated by large distances, offering a path to connect remote quantum systems. However, when facing the distances needed for prac…
Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
Yong Lu, Andreas Bengtsson, Jonathan J. Burnett +8
We experimentally investigate a superconducting qubit coupled to the end of an open transmission line, in a regime where the qubit decay rates to the transmission line and to its o…
Numerical study of Wigner negativity in one-dimensional steady-state resonance fluorescence
Ingrid Strandberg, Yong Lu, Fernando Quijandría +1
In a numerical study, we investigate the steady-state generation of nonclassical states of light from a coherently driven two-level atom in a one-dimensional waveguide. Specificall…
Dark state cooling of a trapped ion using microwave coupling
Yong Lu, Jian-Qi Zhang, Jin-Ming Cui +5
We propose a new dark-state cooling method of trapped ion systems in the Lamb-Dicke limit. With application of microwave dressing the ion, we can obtain two electromagnetically ind…