Parity meter for charge qubits: an efficient quantum entangler

Abstract

We propose a realization of a charge parity meter based on two double quantum dots alongside a quantum point contact. Such a device is a specific example of the general class of mesoscopic quadratic quantum measurement detectors previously investigated by Mao et al. [Phys. Rev. Lett. 93, 056803 (2004)]. Our setup accomplishes entangled state preparation by a current measurement alone, and allows the qubits to be effectively decoupled by pinching off the parity meter. Two applications of the parity meter are discussed: the measurement of Bell's inequality in charge qubits and the realization of a controlled NOT gate.

8 pages, 4 figures; v2: discussion of measurement time, references added

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• Single-shot read-out of an individual electron spin in a quantum dot
• Coherent manipulation of electronic states in a double quantum dot
• Demonstration of conditional gate operation using superconducting charge qubits
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Cited by in corpus (54)

• Deterministic entanglement of superconducting qubits by parity measurement and feedback
• Observation of measurement-induced entanglement and quantum trajectories of remote superconducting qubits
• Demonstration of entanglement-by-measurement of solid state qubits
• Entanglement Metrology Using a Joint Readout of Superconducting Qubits
• Experimental demonstration of continuous quantum error correction
• Tunable joint measurements in the dispersive regime of cavity QED
• Controlled-NOT for multiparticle qubits and topological quantum computation based on parity measurements
• Braiding Majorana zero modes using quantum dots
• Entangling spins by measuring charge: a parity-gate toolbox
• Multipartite electronic entanglement purification with charge detection
• Efficient polarization entanglement concentration for electrons with charge detection
• Non-local transport properties of nanoscale conductor-microwave cavity systems
• Resonant Scattering Can Enhance the Degree of Entanglement
• Entanglement genesis under continuous parity measurement
• Multi-qubit parity measurement in circuit quantum electrodynamics
• Quantum trajectories and their statistics for remotely entangled quantum bits
• Measurement, control, and decay of quantum-dot spins
• Weak measurement and control of entanglement generation
• Parity detection and entanglement with a Mach-Zehnder interferometer
• Quantum entanglement distribution with hybrid parity gate
• Detection and Manipulation of Majorana Fermions in Circuit QED
• Generalized parity measurements
• Prediction and Characterization of Multiple Extremal Paths in Continuously Monitored Qubits
• Dark Bell states in tunnel-coupled spin qubits
• Minimal Entanglement Witness From Electrical Current Correlations
• Analysis of Bell inequality violation in superconducting qubits
• Entanglement between static and flying qubits in an Aharonov-Bohm double electrometer
• Chaos in Continuously Monitored Quantum Systems: An Optimal Path Approach
• Always-On Quantum Error Tracking with Continuous Parity Measurements
• Reverse quantum state engineering using electronic feedback loops
• Weak measurement of quantum dot spin qubits
• Implementing two-photon three-degree-of-freedom hyper-parallel controlled phase flip gate through cavity-assisted interactions
• On-demand maximally entangled states with a parity meter and continuous feedback
• High-efficiency multipartite entanglement purification of electron-spin states with charge detection
• Full Counting Statistics of Quantum Point Contact with Time-dependent Transparency
• Quantum divisibility test and its application in mesoscopic physics
• Sub Decoherence Time Generation and Detection of Orbital Entanglement
• Continuous measurement of a qudit using dispersively coupled radiation
• Weak Measurements with Entangled Probes
• Generation and stabilization of Bell states via repeated projective measurements on a driven ancilla qubit
• Simultaneous readout of two charge qubits
• Entanglement of a pair of quantum emitters via continuous fluorescence measurements: a tutorial
• Quantum error correction benchmarks for continuous weak parity measurements
• Reduced dynamics with renormalization in solid-state charge qubit measurement
• Dynamics of interacting transport qubits
• Measurement-induced entanglement of two transmon qubits by a single photon
• Effects of decoherence and errors on Bell-inequality violation
• Efficient electronic entanglement concentration assisted with single mobile electron
• Entanglement of two non-interacting qubits via a mesoscopic system
• Single-shot energetic-based estimator for entanglement in a half-parity measurement setup
• Optimal multipartite entanglement concentration of electron-spin states based on charge detection and projection measurements
• Dissipationless topological quantum computation for Majorana objects in sparse-dense mixed encoding process
• Efficient multipartite entanglement concentration of electron-spin state with charge detection
• Measuring the squared magnetisation of a molecule