Profile
Masahiro Hotta
Theoretical physicist, Tohoku University
Hotta develops quantum energy teleportation protocols: a local measurement, classical communication of its result and feedback enable energy extraction in specified prepared quantum systems. His scalar-field example accounts for energy injected by the first measurement and negative-energy regions near extraction. With Kazuki Ikeda, he proposes a two-qubit quantum-battery protocol whose experimental validation and extension to larger systems remain further work.
Affiliations
- Tohoku University, Graduate School of Science
Channels
Bibliography
A bibliography listing does not establish authorship. Credits appear under attribution.
Published bibliography entries: 3. Showing 1–3 of 3.
Listed work
Paper · 2025
Exceeding the maximum classical energy density in fully charged quantum batteries
- Masahiro Hotta(Author)
- Kazuki Ikeda(Author)
In their author manuscript, Hotta and Ikeda propose a quantum-battery protocol that uses quantum energy teleportation to increase energy stored in a local subsystem. The protocol starts from an entangled highest-energy state of locally interacting spins, rather than the ground state used in conventional quantum energy teleportation. Alice measures her subsystem and sends the result through a classical channel; Bob uses that information to choose a local operation. In an analytical two-qubit model, this feedback raises Bob’s local energy above its initial value, with the classical comparison defined as maximum total energy divided by subsystem count. The authors identify scaling to larger systems and experimental validation on quantum devices as further research.
Listed work
Paper · 2008
Quantum measurement information as a key to energy extraction from local vacuums
- Masahiro Hotta(Author)
Masahiro Hotta proposes a protocol that extracts energy from local vacuum states of quantum fields by using the information from a quantum measurement. Alice excites the field's ground state with a local measurement, and the resulting wavepackets travel away without Bob, stationed elsewhere, capturing their energy. Alice then sends her result to Bob classically, and his local operation chosen by that result releases positive energy from the field into his apparatus. Negative-energy wavepackets appear around Bob and then chase Alice's positive-energy wavepackets, forming loosely bound states. Energy is extracted even where the field holds no quantum energy on average, and a two-valued measurement is analysed in detail for a massless scalar field in 1+1 dimensions.
Listed work
Paper · 2014
Quantum energy teleportation without a limit of distance
- Masahiro Hotta(Author)
- Jiro Matsumoto(Author)
- Go Yusa(Author)
Masahiro Hotta, Jiro Matsumoto and Go Yusa propose quantum energy teleportation in a massless field with one spatial dimension, using local operations and classical communication after preparing a correlated state. Their vacuum-state bound limits extractable energy inversely with separation; a specially prepared squeezed state can overcome it. The distance-independent result requires changing that state with distance, while a fixed squeezing parameter retains long-distance decay. Alice's measurement injects energy, and positive excitation energy in the squeezed region supports the negative-energy region created when Bob extracts energy. The paper proposes a quantum Hall edge-current implementation, with state preparation and energy resources essential to the result; it does not report a demonstrated long-distance energy-transfer device.