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Inertial Frames of Reference01:03

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Absolute Quantum Yield Measurement of Powder Samples
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Quantum reference frames and their applications to thermodynamics.

Sandu Popescu1, Ana Belén Sainz2, Anthony J Short1

  • 1H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|May 30, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a quantum reference frame that acts as a battery for conserved quantities, enabling approximate implementation of quantum transformations. This physically intuitive construction is practical for quantum thermodynamics and foundations of quantum mechanics.

Keywords:
conservation lawsquantum thermodynamicsreference frames

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Area of Science:

  • Quantum Physics
  • Quantum Information Science
  • Thermodynamics

Background:

  • Implementing arbitrary quantum transformations is challenging under conservation laws.
  • Existing methods often struggle with back-action from conserved quantities.
  • Quantum reference frames are crucial for quantum information processing.

Purpose of the Study:

  • To construct a quantum reference frame capable of implementing unitary transformations despite conserved quantities.
  • To develop a system that absorbs back-action from conservation laws.
  • To apply this framework to quantum thermodynamics with multiple conserved quantities.

Main Methods:

  • Construction of a quantum reference frame using subsystems similar to the target system.
  • Interaction design involving two-body terms coupling system and reference frame.
  • Absorption of back-action from conservation laws by the reference frame.

Main Results:

  • A physically intuitive and implementation-friendly quantum reference frame was constructed.
  • The reference frame functions as a battery for conserved quantities.
  • Arbitrary unitary transformations can be approximately implemented in systems with conserved quantities.

Conclusions:

  • The developed quantum reference frame provides a practical solution for implementing quantum transformations in systems with conserved quantities.
  • This framework enables the definition of explicit batteries for quantum thermodynamic systems.
  • The work contributes to the foundations of quantum mechanics and its societal impact.