Polarizing electron spins with a superconducting flux qubit

Kukita, Shingo; Ookane, Hideaki; Matsuzaki, Yuichiro; Kondo, Yasushi

doi:10.1103/physreva.105.012613

Cited by 2 publications

(4 citation statements)

References 47 publications

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“…[45,46], can be realized by using two superconducting flux qubits (FQ1 and FQ2). Here, Qubit 1 is an electron spin [35]. Thus, ω 2 is the order of GHz.…”

Section: Discussionmentioning

confidence: 99%

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Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Okane¹,

Kamimura²,

Kukita³

et al. 2022

Preprint

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We discuss a quantum refrigerator to increase the ground state probability of a target qubit whose energy difference between the ground and excited states is less than the thermal energy of the environment. We consider two types of quantum refrigerators: (1) one extra qubit with frequent pulse operations and (2) two extra qubits without them. These two types of refrigerators are evaluated from the viewpoint of quantum thermodynamics. More specifically, we calculate the heat removed from the target qubit, the work done for the system, and the coefficient of performance (COP), the ratio between the heat ant the work. We show that the COP of the second type outperforms that of the first type. Our results are useful to design a high-performance quantum refrigerator cooling down a qubit.

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“…[45,46], can be realized by using two superconducting flux qubits (FQ1 and FQ2). Here, Qubit 1 is an electron spin [35]. Thus, ω 2 is the order of GHz.…”

Section: Discussionmentioning

confidence: 99%

“…This problem was, however, discussed and overcome in Ref. [35]. In order to make our models tractable, we thus consider only a single target qubit to be cooled down.…”

Section: Two Models Of Refrigeratormentioning

confidence: 99%

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Okane¹,

Kamimura²,

Kukita³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…This problem was, however, discussed and overcome in Ref. 36 . In order to make our discussions more tractable, we thus consider only a single target qubit to be cooled down.…”

Section: Two Models Of Refrigeratormentioning

confidence: 99%

“…By setting λ = ω 1 , the Hamiltonian H D (t) provides a swapping interaction between Qubit 1 and 2, as shown in Supplemental Material. See, also 33,34,36,39 . Thus, the energy can be transferred from Qubit 1 to Qubit 2.…”

Section: Refrigerator With Frequent Reset: Refrigerator Imentioning

confidence: 99%

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Okane

Kamimura

Kukita

et al. 2023

Preprint

View full text Add to dashboard Cite

We discuss a quantum refrigerator to increase the ground state probability of a target qubit whose energy difference between the ground and excited states is less than the thermal energyof its environment. We consider two types of quantum refrigerators: (1) one extra qubit with frequent pulse operations and(2) two extra qubits without them. These two types of refrigerators are evaluated from the viewpoint of quantum thermodynamics. More specifically,we calculate the heat removed from the target qubit, the work done for the system, and the coefficient of performance (COP), the ratio between the heat ant work.We show that the COP of the second type outperforms that of the first one.Our results are useful to design a high-performance quantum refrigerator cooling down a qubit.

show abstract

Polarizing electron spins with a superconducting flux qubit

Cited by 2 publications

References 47 publications

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

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