Complete Bell-state Analysis for Superconducting-quantum-interference-Machine Qubits With Transitionless Tracking Algorithm > 자유게시판

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In this paper, we suggest a protocol for complete Bell-state analysis for 2 superconducting-quantum-interference-machine qubits. The Bell-state evaluation could be completed through the use of a sequence of microwave pulses designed by the transitionless tracking algorithm, which is an helpful method in the technique of shortcut to adiabaticity. After the entire process, the knowledge for distinguishing four Bell states will be encoded on two auxiliary qubits, whereas the Bell states keep unchanged. One can read out the data by detecting the auxiliary qubits. Thus the Bell-state evaluation is nondestructive. The numerical simulations show that the protocol possesses excessive success chance of distinguishing each Bell state with present experimental expertise even when decoherence is taken into consideration. Thus, the protocol may have potential purposes for the knowledge readout in quantum communications and quantum computations in superconducting quantum networks. Entanglement is a fundamental idea in quantum data science. It offers risk to check quantum nonlocality in opposition to local hidden theory BellPhysics1 ; Greenberger ; DurPRA62 , and also performs a key function in various quantum information tasks KarlssonPRA58 ; DFGPRA72 ; EkertPRL67 ; DFGPRA68 ; BennettPRL69 ; LXSPRA65 ; SYBPRA81I .

Therefore, preparing DZJPRA74 ; DLMPRL90 , transferring WTJPRA85 ; HCYPRB83 and purifying RBCPRA90 ; PanNat410 all sorts of entangled states in numerous physical techniques change into sizzling topics in quantum information processing (QIP). As Bell states of two qubits are simple to be obtained and manipulated, they've been employed as the knowledge carriers in quantum communications and quantum computations EkertPRL67 ; BennettPRL69 ; BennettPRL68 . Thus when utilizing Bell states as information carriers, iTagPro features studying out quantum data encoded on Bell states is an indispensable activity, which tremendously motivated the researches on the Bell-state analysis. At the beginning, researchers primarily paid their attentions on the Bell-state evaluation for polarized photons with liner optical elements MattlePRL76 ; HouwelingenPRL96 . But sadly, it have been proven by protocols VaidmanPRA59 ; CalsamigliaPRA65 that the Bell-state analysis with only linear optical aspect have optimum success chance of 0.5. Besides, the Bell-state analysis normally destroys the entanglement which causes the waste of physical resources. Therefore, to realize complete and nondestructive Bell-state analysis and to take advantage of the advantages of different bodily techniques, researchers have turned their attentions on Bell states in varied techniques by making use of many new techniques, reminiscent of nonlinearities and hyperentanglement.

Until now, complete and nondestructive Bell-state analysis for photons SYBPRA81II ; SYBPRA82 ; BarbieriPRA75 ; WTJPRA86 ; RBCOE20 ; BonatoPRL104 ; XYJOSAB31 , atoms HYCPB19 , iTagPro support spins inside quantum dots WHRIJTP52 ; KYHAPB119 and nitrogen-vacancy centers LJZIJTP56 have been reported. Lately, the superconducting system has been developed a lot, iTagPro support and is now deemed as a very promising candidate to implement quantum info duties MakhlinRMP73 ; XZLRMP85 ; VionSci296 ; YYSci296 ; YCPPRL92 ; YCPPRA67 ; YCPPRA74 ; YCPPRA82 ; ClarkeNature453 ; DevoretADP16 ; YCPPRA86 ; BlaisPRA69 ; WallraffNature431 ; YCPPRA87 ; ChiorescuNature431 ; SteinbachPRL87 ; FilippPRL102 ; BialczakNP6 ; YamamotoPRB82 ; ReedPRL105 ; MajerNature449 ; DiCarloNature460 ; SchmidtADP525 ; StrauchPRL105 ; KochPRA76 , because it possesses many benefits. Superconducting qubits, including phase qubits, change qubits, iTagPro support flux qubits, etc., are outstanding with their comparatively long decoherence time ClarkeNature453 and excellent scalability VionSci296 ; YYSci296 ; ChiorescuNature431 . 1) The positions of SQUID qubits in a cavity are fastened. That makes them holds superiority in contrast with impartial atoms, which requires to be managed the centers of mass motion in a cavity.

YCPPRL92 ; YCPPRA67 . 2) When placing SQUID qubits right into a superconducting cavity, decoherence induced due to the exterior iTagPro device surroundings could be significantly suppressed for the reason that superconducting cavity could be thought-about because the magnetic shield for SQUID qubits YCPPRA67 . 3) The sturdy-coupling limit of the cavity QED may be easily realized for SQUID qubits embedded in a cavity, whereas it is troublesome to be realized with atoms YCPPRL92 . 4) The extent construction of each individual SQUID qubit may be adjusted simply YCPPRL92 . The great advantages of SQUID qubits make them enticing decisions to implement quantum information tasks. To this point, SQUID qubits have been widely used in entanglement preparations YCPPRL92 ; YCPPRA67 ; DZJPRA74 ; SKHPRA75 , info transfers YCPPRL92 ; YCPPRA67 , logic gates YCPPRA67 . However, Bell-state evaluation for SQUID qubits nonetheless has lots room for itagpro locator researches. However, when choosing superconducting system as the platform for QIP, an ineluctable query is to design microwave pulses driving superconducting qubits to complete various operations.