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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Phonon downconversion to suppress correlated errors in superconducting qubits.

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Researchers developed a method to protect superconducting qubits from correlated errors caused by background radiation. This technique significantly reduces quasiparticle poisoning, enhancing quantum information preservation for quantum computing.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Materials Science

Background:

  • Correlated errors, unlike local errors, pose a significant threat to quantum information in superconducting qubits.
  • Background radioactivity generates energetic phonons, leading to quasiparticle excitations that can corrupt quantum states across a chip.
  • Existing quantum error correction methods are insufficient against these correlated, chip-wide poisoning events.

Purpose of the Study:

  • To mitigate correlated errors in superconducting qubits caused by background radiation-induced quasiparticles.
  • To investigate the effectiveness of normal metal reservoirs in downconverting high-energy phonons.
  • To demonstrate a significant reduction in quasiparticle poisoning events.

Main Methods:

  • Integration of normal metal reservoirs on the back side of qubit chips to absorb and downconvert phonons.
  • Implementation of a pump-probe scheme for controlled injection and analysis of pair-breaking phonons.
  • Utilizing a Ramsey interferometer to monitor quasiparticle parity on multiple qubits simultaneously.

Main Results:

  • Demonstrated a reduction in the flux of pair-breaking phonons by over a factor of 20 using back-side metallization.
  • Observed a two-order of magnitude reduction in correlated poisoning events attributed to background radiation.
  • Confirmed the efficacy of the phonon downconversion technique in protecting qubits.

Conclusions:

  • Normal metal reservoirs effectively suppress energetic phonons, preventing quasiparticle poisoning in superconducting qubits.
  • The developed method offers a promising solution for enhancing the coherence and reliability of quantum processors.
  • This advancement is crucial for scaling up quantum computers and achieving fault-tolerant quantum computation.