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The microwave phase locking in Bloch transistor.

Ilya Antonov1, Rais S Shaikhaidarov2,3, Kyung Ho Kim1,4

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A new quantum device, the Bloch transistor (BT), utilizes quantum coherent phase slip to deliver quantized current. This technology is scalable and compatible with other superconducting quantum devices.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superconductivity

Background:

  • Coherent quantum phase slip and current quantization are fundamental phenomena in superconductors.
  • These phenomena are dual to Cooper pair tunneling and voltage quantization (Shapiro steps).
  • Recent experiments have demonstrated these phenomena, paving the way for new quantum devices.

Purpose of the Study:

  • To introduce and study the Bloch transistor (BT), a novel quantum device.
  • To analyze the operational principles and parameters of the BT.
  • To explore the potential of BT technology in cryogenic quantum platforms.

Main Methods:

  • The study focuses on two coupled Josephson Junctions (JJ) operating in the regime of coherent quantum phase slip.
  • A new mechanism for phase-locking Bloch oscillations in JJs to microwaves via induced charge is central to BT operation.
  • The Aharonov-Casher effect is investigated for gate voltage control of current quantization.

Main Results:

  • The Bloch transistor (BT) can deliver quantized, non-dissipative current to quantum circuits.
  • Charge phase locking enables current quantization and gate voltage control.
  • The study analyzes the BT's parameters and operational characteristics.

Conclusions:

  • The Bloch transistor (BT) represents a significant advancement in quantum device technology.
  • BT technology is scalable and compatible with existing superconducting quantum devices.
  • BT is a key component of an emerging cryogenic quantum technology platform.