Probing the Tavis-Cummings level splitting with intermediate-scale superconducting circuits

Abstract

We demonstrate the local control of up to eight two-level systems interacting strongly with a microwave cavity. Following calibration, the frequency of each individual two-level system (qubit) is tunable without influencing the others. Bringing the qubits one by one on resonance with the cavity, we observe the collective coupling strength of the qubit ensemble. The splitting scales up with the square root of the number of the qubits, which is the hallmark of the Tavis-Cummings model. The local control circuitry causes a bypass shunting the resonator, and a Fano interference in the microwave readout, whose contribution can be calibrated away to recover the pure cavity spectrum. The simulator's attainable size of dressed states with up to five qubits is limited by reduced signal visibility, and -- if uncalibrated -- by off-resonance shifts of sub-components. Our work demonstrates control and readout of quantum coherent mesoscopic multi-qubit system of intermediate scale under conditions of noise.

References in corpus (21)

• Charge insensitive qubit design derived from the Cooper pair box
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• Quantum Simulation
• QuTiP: An open-source Python framework for the dynamics of open quantum systems
• Ultrastrong coupling between light and matter
• Coupling Superconducting Qubits via a Cavity Bus
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Dressed Collective Qubit States and the Tavis-Cummings Model in Circuit QED
• Implementing the Quantum von Neumann Architecture with Superconducting Circuits
• Experimental Investigation of an Eight Qubit Unit Cell in a Superconducting Optimization Processor
• High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
• Analog quantum simulation of the Rabi model in the ultra-strong coupling regime
• Implementation of a Quantum Metamaterial
• Response of the Strongly-Driven Jaynes-Cummings Oscillator
• Generation and controllable switching of superradiant and subradiant states in a 10-qubit superconducting circuit
• Coherent coupled qubits for quantum annealing
• Multi-mode mediated exchange coupling in cavity QED
• Tavis-Cummings model and collective multi-qubit entanglement in trapped ions
• Multi-photon dressing of an anharmonic superconducting many-level quantum circuit
• Preparation of Subradiant States using Local Qubit Control in Circuit QED
• Resonance inversion in a superconducting cavity coupled to artificial atoms and a microwave background

Cited by in corpus (6)

• Collective enhancement in dissipative quantum batteries
• Optimal energy storage in the Tavis-Cummings quantum battery
• Cavity-QED of a quantum metamaterial with tunable disorder
• Observation of collapse and revival in a superconducting atomic frequency comb
• Tunable Anderson Localization of Dark States
• Generalized Collective Lamb Shift