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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing...
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Autonomously stabilized entanglement between two superconducting quantum bits.

S Shankar1, M Hatridge1, Z Leghtas1

  • 1Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA.

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Researchers stabilized an entangled Bell state in a two-qubit superconducting system using autonomous feedback. This breakthrough advances quantum error correction and the development of large-scale quantum computers.

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Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Quantum error correction is crucial for scalable quantum computers.
  • Stabilizing quantum states against decoherence is a key challenge.
  • Previous methods relied on measurement-based feedback.

Purpose of the Study:

  • To demonstrate the stabilization of an entangled Bell state in a two-qubit superconducting system.
  • To develop an autonomous feedback scheme for quantum state stabilization.
  • To provide a building block for quantum error correction.

Main Methods:

  • Utilized an autonomous feedback scheme with continuous drives.
  • Engineered a specific coupling between a two-qubit register and a dissipative reservoir.
  • Leveraged engineered dissipation to counteract decoherence.

Main Results:

  • Successfully stabilized an entangled Bell state of two superconducting qubits for an arbitrary duration.
  • The autonomous feedback scheme integrated the feedback loop into the Hamiltonian.
  • The steady state of the system was a Bell state, essential for quantum information processing.

Conclusions:

  • Autonomous feedback schemes offer a novel approach to quantum error correction.
  • Engineered dissipation eliminates the need for complex external feedback loops.
  • This technique is broadly applicable to various quantum systems, paving the way for robust quantum computation.