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@ARTICLE{Mrstedt:907771,
      author       = {Mörstedt, Timm Fabian and Viitanen, Arto and Vadimov,
                      Vasilii and Sevriuk, Vasilii and Partanen, Matti and
                      Hyyppä, Eric and Catelani, Gianluigi and Silveri, Matti and
                      Tan, Kuan Yen and Möttönen, Mikko},
      title        = {{R}ecent {D}evelopments in {Q}uantum‐{C}ircuit
                      {R}efrigeration},
      journal      = {Annalen der Physik},
      volume       = {534},
      number       = {7},
      issn         = {0003-3804},
      address      = {Leipzig},
      publisher    = {Barth},
      reportid     = {FZJ-2022-02200},
      pages        = {2100543},
      year         = {2022},
      abstract     = {The recent progress in direct active cooling of the
                      quantum-electric degrees of freedom in engineered circuits,
                      or quantum-circuit refrigeration is reviewed. In 2017, the
                      discovery of a quantum-circuit refrigerator (QCR) based on
                      photon-assisted tunneling of quasiparticles through
                      normal-metal–insulator–superconductor junctions inspired
                      a series of experimental studies demonstrating the following
                      main properties: i) the direct-current (dc) bias voltage of
                      the junction can change the QCR-induced damping rate of a
                      superconducting microwave resonator by orders of magnitude
                      and give rise to nontrivial Lamb shifts, ii) the damping
                      rate can be controlled in nanosecond time scales, and ii)
                      the dc bias can be replaced by a microwave excitation, the
                      amplitude of which controls the induced damping rate.
                      Theoretically, it is predicted that state-of-the-art
                      superconducting resonators and qubits can be reset with an
                      infidelity lower than 10−4 in tens of nanoseconds using
                      experimentally feasible parameters. A QCR-equipped resonator
                      has also been demonstrated as an incoherent photon source
                      with an output temperature above 1 K yet operating at
                      millikelvin. This source has been used to calibrate
                      cryogenic amplification chains. In the future, the QCR may
                      be experimentally used to quickly reset superconducting
                      qubits, and hence assist in the great challenge of building
                      a practical quantum computer.},
      cin          = {PGI-11},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-11-20170113},
      pnm          = {5222 - Exploratory Qubits (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5222},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000796547200001},
      doi          = {10.1002/andp.202100543},
      url          = {https://juser.fz-juelich.de/record/907771},
}