Macroscopic Einstein-Podolsky-Rosen pairs in superconducting circuits

Abstract

We propose an efficient approach to prepare Einstein-Podolsky-Rosen (EPR) pairs in currently existing Josephson nanocircuits with capacitive couplings. In these fixed coupling circuits, two-qubit logic gates could be easily implemented while, strictly speaking, single-qubit gates cannot be easily realized. For a known two-qubit state, conditional single-qubit operation could still be designed to evolve only the selected qubit and keep the other qubit unchanged; the rotation of the selected qubit depends on the state of the other one. These conditional single-qubit operations allow to deterministically generate the well-known Einstein-Podolsky-Rosen pairs, represented by EPR-Bell (or Bell) states. Quantum-state tomography is further proposed to experimentally confirm the generation of these states. The decays of the prepared EPR pairs are analyzed using numerical simulations. Possible application of the generated EPR pairs to test Bell's Inequality is also discussed.

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References in corpus (14)

• Demonstration of conditional gate operation using superconducting charge qubits
• Quantum noise in the Josephson charge qubit
• Low- and high-frequency noise from coherent two-level systems
• Initial decoherence in solid state qubits
• Experimental Bell Inequality Violation with an Atom and a Photon
• Tomographic measurements on superconducting qubit states
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• Spectroscopy of Three-Particle Entanglement in a Macroscopic Superconducting Circuit
• Testing Bell's inequality in constantly coupled Josephson circuits by effective single-qubit operations
• Quantum tomography for solid state qubits
• Coupling Josephson qubits via a current-biased information bus
• Scalable fault-tolerant quantum computation in DFS blocks
• Coherently manipulating two-qubit quantum information using a pair of simultaneous laser pulses
• Quantum logic operations and creation of entanglement in a scalable superconducting quantum computer with long-range constant interaction between qubits

Cited by in corpus (20)

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• Parity meter for charge qubits: an efficient quantum entangler
• Entangling superconducting qubits in a multi-cavity system
• Protecting entanglement in superconducting qubits
• Two-qubit decoherence mechanisms revealed via quantum process tomography
• Bell inequality violation versus entanglement in presence of local decoherence
• Entanglement creation in circuit QED via Landau-Zener sweeps
• Crosstalk-insensitive method for simultaneously coupling multiple pairs of resonators
• Experimental violation of Bell inequalities for multi-dimensional systems
• Robust stationary entanglement of two coupled qubits in independent environments
• Analysis of Bell inequality violation in superconducting qubits
• Testing tripartite Mermin inequalities by spectral joint-measurements of qubits
• Non-Markovian entanglement dynamics in coupled superconducting qubit systems
• Quasi-Bell states in a strongly coupled qubit-oscillator system and their delocalization in the phase space
• Effects of decoherence and errors on Bell-inequality violation
• Evolution of a hybrid micro-macro entangled state of the qubit-oscillator system via the generalized rotating wave approximation
• Circuit QED: Generation of two-transmon-qutrit entangled states via resonant interaction