The evolution of quantum technologies, including quantum communication, quantum sensing, and quantum computing, has attracted a lot of attention recently. For applications of quantum sensors, it is important to minimize the size of the device, and quantum-limited sensitivity is the ultimate goal. In this work, the researchers demonstrated the first high-frequency nanoscale quantum detector with a sensitivity below the quantum limit. The device is based on a superconducting resonator consisting of a nanowire, a quantum dot, and a superconducting quantum interference device (SQUID). By breaking the time-reversal symmetry of the device with an external magnetic field, the device can be used as a highly sensitive quantum detector with a simultaneous charge-phase measurement. The setup achieved a sensitivity below the quantum limit for a charge detector. The device can be used as a frequency multiplexer and a dispersive detector in future quantum protocols.
The researchers, from the Max Planck Institute of Quantum Optics, have built a quantum dot microwave resonator using a thin film of semiconductor material, called a nanowire. The resonator consists of six qubits consisting of a pair of superconducting quantum interference devices (SQUIDs) placed next to each other to form a symmetrical double quantum dot. The resonator is coupled to a quantum point contact detector and is able to act as a frequency multiplexer and a dispersive detector at the same time. The device enables fast and sensitive characterization of the qubits at microwave frequencies. The research is published in Nature on 30 June 2018. See the research video here.
The goal of this work is to test the hypothesis that ultracold dipolar gases can provide a controllable system for the study of quantum many-body physics. In a laboratory experiment, the authors explore the effects of dipolar interactions on the phase diagram of a gas of ultracold polar molecules, which are loaded into an optical dipole trap. The authors find that the gas phase can be tuned from a superfluid to a Mott insulator, and that the superfluid-to-Mott insulator transition can be induced by changing the dipolar interaction strength.
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