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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Hardware-Efficient Microwave-Activated Tunable Coupling between Superconducting Qubits.

Bradley K Mitchell1,2, Ravi K Naik1,2, Alexis Morvan1,2

  • 1Quantum Nanoelectronics Laboratory, University of California, Berkeley, Berkeley, California 94720, USA.

Physical Review Letters
|December 3, 2021
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Summary
This summary is machine-generated.

Researchers developed a new method for tunable quantum entanglement in superconducting circuits. This technique uses off-resonant driving to control qubit interactions, improving gate fidelity for quantum computation.

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Area of Science:

  • Quantum Information Science
  • Superconducting Quantum Computing

Background:

  • Achieving high-fidelity, tunable entanglement between qubits is essential for gate-based quantum computation.
  • Current methods using flux-tunable qubits or coupling elements introduce complexity and noise.

Purpose of the Study:

  • To demonstrate a novel method for inducing tunable ZZ interactions between fixed-frequency transmon qubits.
  • To explore an alternative approach to controlled interactions in superconducting circuits, reducing reliance on tunable hardware.

Main Methods:

  • Utilizing off-resonant microwave driving of two fixed-frequency transmon qubits to create a tunable ZZ interaction.
  • Characterizing the tunable coupling strength and sign-flipping capability.
  • Implementing a controlled-phase (CZ) gate using the developed interaction.

Main Results:

  • Achieved tunable coupling strength over an order of magnitude larger than static coupling.
  • Demonstrated the ability to change the sign of the interaction, enabling cancellation of idle coupling.
  • Implemented a CZ gate with a fidelity of 99.43(1)%, limited by incoherent errors.

Conclusions:

  • The off-resonant driving method provides a robust and scalable approach for tunable qubit interactions in large quantum processors.
  • This technique is resilient to microwave crosstalk and allows flexible drive frequency selection.
  • The demonstrated CZ gate fidelity highlights the potential of this method for advancing quantum computation.