Teleportation with superconducting qubits

Salimian, S.; Tavassoly, M. K.; Sehati, N.

doi:10.1140/epjd/e2020-10049-0

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…The question which remains is how much entanglement can be generated or maintained when smaller dissipation rates are used. Interesting actual studies consider Bell states in superconducting qubits in minimal (or zero) dissipation regimes [71][72][73][74][75][76].…”

Section: Starting From the Ground Statementioning

confidence: 99%

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Tracking control of two qubit entanglement using piecewise time-independent method

Delben¹,

Beims²

2020

Phys. Scr.

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The tracking control of quantum correlations between two coupled qubits is analyzed, where only one of the qubits is coupled to a Markovian environment. Such a system is a generalized model that can be used, for example, to study the problem of a nuclear spin coupled to the electron spin exposed to the environment. Using an external control field, we increase the time for which the system remains coherent and entangled. The control field is an external potential applied to the system, which contains two adjustable parameters, the intensity and the phase of the field. Furthermore, we present quantum control protocols with different targets. First, for population control of both qubits, second for the coherence control of both two-level systems, and finally for the control of entanglement. Due to analytical for X states the target function can directly be identified with the entanglement. Furthermore, we have shown that when smaller dissipation rates are considered, the control method generates larger stable entanglement between the qubits.

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Section: Starting From the Ground Statementioning

confidence: 99%

“…Additional results present the control of initially prepared X states under small dissipation rates. In special, we consider the control of Bell states, a subject of actual interest in superconducting qubits in minimal (or zero) dissipation regimes [71][72][73][74][75][76].…”

Section: Introductionmentioning

confidence: 99%

Tracking control of two qubit entanglement using piecewise time-independent method

Delben¹,

Beims²

2020

Phys. Scr.

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“…A hybrid superconductor-optical quantum repeater is provided in 36 . Controllability of coupling strength between SC qubits with each other via applying the external magnetic field is the other advantage of SC qubits 37 – 42 . Also, quantum networks and quantum repeater protocols require memories to save and release the entangled states.…”

Section: Introductionmentioning

confidence: 99%

Multistage entanglement swapping using superconducting qubits in the absence and presence of dissipative environment without Bell state measurement

Salimian,

Tavassoly,

Ghasemi

2023

Sci Rep

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In recent decades the entangled state generation is of great importance in the quantum information processing and technologies. In this paper, producing the distributed entangled state of superconducting (SC) qubits is considered using an entanglement swapping protocol in three successive stages. The SC qubit pairs $$(i,\,i+1$$ ( i , i + 1 with $$i=1,\,3,\,5,\,7)$$ i = 1 , 3 , 5 , 7 ) , where each pair of the qubits has been placed on a separate chip, are initially prepared in maximally entangled states. The external magnetic fields on capacitively coupled pairs $$(2,\,3)$$ ( 2 , 3 ) and $$(6,\,7)$$ ( 6 , 7 ) are implemented for modulating the frequency of qubits. Then, the SC qubits $$(1,\,4)$$ ( 1 , 4 ) and $$(5,\,8)$$ ( 5 , 8 ) are converted into entangled states via operating proper measurements instead of Bell state measurement (which is generally a hard task). Finally, the distributed entangled state of target SC qubits $$(1,\,8)$$ ( 1 , 8 ) can be obtained by applying external magnetic fields on qubits $$(4,\,5)$$ ( 4 , 5 ) and via operating suitable measurements. This process is studied in the absence and presence of thermal decoherence effects. The concurrence, as a measure of entanglement between two target qubits, success probability of the distributed entangled states and the corresponding fidelities are evaluated, by which we find that the state of target SC qubits $$(1,\,8)$$ ( 1 , 8 ) is converted to Bell state with maximum entanglement at some moments of time. Under appropriate conditions the maximum of success probability of the obtained states in each stage approaches 1. However, the maxima of concurrence and success probability gradually decrease due to the thermal noise as time goes on. Moreover, compelling amounts of fidelity, success probability and entanglement can be obtained for the achieved entangled states.

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“…More recently, teleportation with a transmon circuit was investigated [43]. Also, teleportation of an unknown state with SC qubits has been considered [44]. In [45], quantum teleportation between nanomechanical modes in an all solid-state circuit has been studied and entanglement swapping of two SC qubits has been discussed in [46].…”

mentioning

confidence: 99%

Teleportation of the entangled state of two superconducting qubits

Salimian

Tavassoly

Sehati

2022

EPL

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An efficient scheme is proposed to teleport an entangled state of two superconducting (SC) qubits from Alice's to Bob's lab. This type of two-level systems has recently attracted a lot of attention due to the possible tunability of the coupling strength of the qubits with each other. To achieve the purpose, we first generate the GHZ state as the necessary teleportation channel. Then, appropriate interactions are performed in two processes between two of the five qubits, each with a certain frequency modulative external magnetic field which is applied on specific one of the qubits. Next, via applying proper gates and measurements in each lab, we observe that the teleportation can be successfully performed with maximum possible values of fidelity and success probability. At last, to make the protocol close to reality, decay rates of SC qubits are also taken into account, showing that our protocol still works well, satisfactorily.

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Teleportation with superconducting qubits

Cited by 7 publications

References 38 publications

Tracking control of two qubit entanglement using piecewise time-independent method

Tracking control of two qubit entanglement using piecewise time-independent method

Multistage entanglement swapping using superconducting qubits in the absence and presence of dissipative environment without Bell state measurement

Teleportation of the entangled state of two superconducting qubits

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