A Schrodinger Cat Living in Two Boxes

Abstract

Quantum superpositions of distinct coherent states in a single-mode harmonic oscillator, known as "cat states", have been an elegant demonstration of Schrodinger's famous cat paradox. Here, we realize a two-mode cat state of electromagnetic fields in two microwave cavities bridged by a superconducting artificial atom, which can also be viewed as an entangled pair of single-cavity cat states. We present full quantum state tomography of this complex cat state over a Hilbert space exceeding 100 dimensions via quantum non-demolition measurements of the joint photon number parity. The ability to manipulate such multi-cavity quantum states paves the way for logical operations between redundantly encoded qubits for fault-tolerant quantum computation and communication.

References in corpus (12)

• Charge insensitive qubit design derived from the Cooper pair box
• 14-qubit entanglement: creation and coherence
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Reconstruction of non-classical cavity field states with snapshots of their decoherence
• Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
• Direct Fidelity Estimation from Few Pauli Measurements
• New class of quantum error-correcting codes for a bosonic mode
• Black-box superconducting circuit quantization
• Coherence and Decay of Higher Energy Levels of a Superconducting Transmon Qubit
• Deterministic entanglement of photons in two superconducting microwave resonators
• Deterministic protocol for mapping a qubit to coherent state superpositions in a cavity
• A coaxial line architecture for integrating and scaling 3D cQED systems

Cited by in corpus (209)

• A Quantum Engineer's Guide to Superconducting Qubits
• Superconducting Qubits: Current State of Play
• Microwave photonics with superconducting quantum circuits
• Quantum information processing with superconducting circuits: a review
• Quantum acoustics with superconducting qubits
• New class of quantum error-correcting codes for a bosonic mode
• Superconducting Quantum Computing: A Review
• Demonstration of quantum error correction and universal gate set on a binomial bosonic logical qubit
• Deterministic teleportation of a quantum gate between two logical qubits
• Nonexponential decay of a giant artificial atom
• Macroscopic quantum states: measures, fragility and implementations
• Superconductor-semiconductor hybrid cavity quantum electrodynamics
• Repetition Cat Qubits for Fault-Tolerant Quantum Computation
• Enhancing cavity QED via anti-squeezing: synthetic ultra-strong coupling
• Protecting a Bosonic Qubit with Autonomous Quantum Error Correction
• Coherent oscillations inside a quantum manifold stabilized by dissipation
• Entangling Bosonic Modes via an Engineered Exchange Interaction
• Quantum information processing with bosonic qubits in circuit QED
• Schrodinger's catapult: Launching multiphoton quantum states from a microwave cavity memory
• Quantum critical regime in a quadratically-driven nonlinear photonic lattice
• Noisy intermediate-scale quantum computers
• A CNOT gate between multiphoton qubits encoded in two cavities
• Quantum Estimation Methods for Quantum Illumination
• Quantum control of bosonic modes with superconducting circuits
• Resolving Phonon Fock States in a Multimode Cavity with a Double-Slit Qubit
• Quantum Computation Based on Quantum Adiabatic Bifurcations of Kerr-Nonlinear Parametric Oscillators
• Cat codes with optimal decoherence suppression for a lossy bosonic channel
• Superconducting cavity qubit with tens of milliseconds single-photon coherence time
• Entanglement of photons in their dual wave-particle nature
• Programmable interference between two microwave quantum memories
• A coaxial line architecture for integrating and scaling 3D cQED systems
• A tunable Josephson platform to explore many-body quantum optics in circuit-QED
• Pair-cat codes: autonomous error-correction with low-order nonlinearity
• Direct characteristic-function tomography of quantum states of the trapped-ion motional oscillator
• Quantum error correction using squeezed Schrödinger cat states
• Demonstration of Controlled-Phase Gates between Two Error-Correctable Photonic Qubits
• Seamless high-Q microwave cavities for multimode circuit QED
• Dual-rail encoding with superconducting cavities
• Multimode photon blockade
• Spontaneous symmetry breaking in a quadratically-driven nonlinear photonic lattice
• A flying Schrödinger cat in multipartite entangled states
• Quantum Channel Construction with Circuit Quantum Electrodynamics
• The upside of noise: engineered dissipation as a resource in superconducting circuits
• Multiphoton Jaynes-Cummings Model: Arbitrary Rotations in Fock Space and Quantum Filters
• Approximate Autonomous Quantum Error Correction with Reinforcement Learning
• High-fidelity parametric beamsplitting with a parity-protected converter
• Fast Generation of GHZ-like States Using Collective-Spin XYZ Model
• One-step implementation of a hybrid Fredkin gate with quantum memories and single superconducting qubit in circuit QED and its applications
• A quantum battery with quadratic driving
• Superposition of two-mode squeezed states for quantum information processing and quantum sensing
• Engineering Schrödinger cat states with a photonic even-parity detector
• Degeneracy-preserving quantum non-demolition measurement of parity-type observables for cat-qubits
• Optically induced phonon blockade in an optomechanical system with second-order nonlinearity
• Encoding qubits in multimode grid states
• Hidden time-reversal symmetry, quantum detailed balance and exact solutions of driven-dissipative quantum systems
• Gaussian trajectory approach to dissipative phase transitions: the case of quadratically driven photonic lattices
• Shortcuts to adiabatic cat-state generation in bosonic Josephson junctions
• Local Sensing with the Multi-Level AC Stark Effect
• All macroscopic quantum states are fragile and hard to prepare
• Tunable hole spin-photon interaction based on g-matrix modulation
• Dynamics of transient cat-states in degenerate parametric oscillation with and without nonlinear Kerr interactions
• Classical shadow tomography for continuous variables quantum systems
• Overcoming decoherence of cat-states formed in a cavity using squeezed-state inputs
• Creation, storage and retrieval of an optomechanical cat state
• Incomplete Detection of Nonclassical Phase-Space Distributions
• Bistability in a Mesoscopic Josephson Junction Array Resonator
• Manipulating complex hybrid entanglement and testing multipartite Bell inequalities in a superconducting circuit
• Superconducting Resonator-Rydberg Atom Hybrid in the Strong Coupling Regime
• Generating and detecting entangled cat states in dissipatively coupled degenerate optical parametric oscillators
• Deterministic generation of Greenberger-Horne-Zeilinger entangled states of cat-state qubits in circuit QED
• Two-way covert quantum communication in the microwave regime
• Dissipative stabilization of entangled cat states using a driven Bose-Hubbard dimer
• Entangled coherent states by mixing squeezed vacuum and coherent light
• Propagating Wigner-Negative States Generated from the Steady-State Emission of a Superconducting Qubit
• Quantitative tomography for continuous variable quantum systems
• Quantum Rabi oscillations in coherent and in mesoscopic Schrödinger "cat" field states
• Universal controlled-phase gate with cat-state qubits in circuit QED
• Two-photon driven Kerr quantum oscillator with multiple spectral degeneracies
• Protecting quantum entanglement between error-corrected logical qubits
• On-Demand Generation of Traveling Cat States Using a Parametric Oscillator
• Dynamics-Based Entanglement Witnesses for Non-Gaussian States of Harmonic Oscillators
• Conditional not displacement: fast multi-oscillator control with a single qubit
• Quantum Rabi Model with Two-Photon Relaxation
• Towards long-distance quantum networks with superconducting processors and optical links
• Geometric pathway to scalable quantum sensing
• Hybrid Oscillator-Qubit Quantum Processors: Instruction Set Architectures, Abstract Machine Models, and Applications
• Entanglement of quantum circular states of light
• The Wigner Current for Open Quantum Systems
• Two-mode Schrödinger-cat states with nonlinear optomechanics: generation and verification of non-Gaussian mechanical entanglement
• Quantum computation with cat qubits
• Hybrid controlled-SUM gate with one superconducting qutrit and one cat-state qutrit and application in hybrid entangled state preparation
• Creating cat states in one-dimensional quantum walks using delocalized initial states
• Tunable refrigerator for non-linear quantum electric circuits
• Single-step implementation of a hybrid controlled-NOT gate with one superconducting qubit simultaneously controlling multiple target cat-state qubits
• Optimal entangled coherent states in lossy quantum-enhanced metrology
• Simulating Molecular Spectroscopy with Circuit Quantum Electrodynamics
• Applications of the Fokker-Planck equation in circuit quantum electrodynamics
• Painting Non-Classical States of Spin or Motion with Shaped Single Photons
• Generation and stabilization of entangled coherent states for the vibrational modes of a trapped ion
• Optimized Tomography of Continuous Variable Systems Using Excitation Counting
• Circuit QED: single-step realization of a multiqubit controlled phase gate with one microwave photonic qubit simultaneously controlling $n-1$ microwave photonic qubits
• Ultrastrong tunable coupler between superconducting LC resonators
• Deterministic nonlinear phase gates induced by a single qubit
• Stabilization of multi-mode Schrodinger cat states via normal-mode dissipation engineering
• High-Coherence Kerr-cat qubit in 2D architecture
• Fault-tolerant quantum computation by hybrid qubits with bosonic cat-code and single photons
• Quantum tetrachotomous states: Superposition of four coherent states on a line in phase space
• Crosstalk-Robust Quantum Control in Multimode Bosonic Systems
• Autonomous Quantum State Transfer by Dissipation Engineering
• Leggett-Garg tests of macro-realism for multi-particle systems including double-well Bose-Einstein condensates
• Classical critical dynamics in quadratically driven Kerr resonators
• Tuning a 3D Microwave Cavity via Superfluid Helium at MilliKelvin Temperatures
• Designing Kerr interactions using multiple superconducting qubit types in a single circuit
• A tunable quantum dissipator for active resonator reset in circuit QED
• Experimental repetitive quantum channel simulation
• Stroboscopic high-order nonlinearity for quantum optomechanics
• On the static effective Lindbladian of the squeezed Kerr oscillator
• Testing macroscopic local realism using cat-states and Bell inequalities in time
• Ion-based nondestructive sensor for cavity photon numbers
• Universal quantum gate with hybrid qubits in circuit quantum electrodynamics
• Leggett-Garg tests of macro-realism for dynamical cat-states evolving in a nonlinear medium
• Optimizing single microwave-photon detection: Input-Output theory
• Entangling Schrödinger's cat states by bridging discrete- and continuous-variable encoding
• Tunable ohmic environment using Josephson junction chains
• Quantum teleportation of qudits by means of generalized quasi-Bell states of light
• Parametrically driving a quantum oscillator into exceptionality
• Generation of macroscopic entangled cat states in a molecular cavity-QED system
• Deterministic multi-phonon entanglement between two mechanical resonators on separate substrates
• Signifying the Schrodinger cat in the context of testing macroscopic realism
• Single-sideband modulator for frequency domain multiplexing of superconducting qubit readout
• Certifiable Lower Bounds of Wigner Negativity Volume and Non-Gaussian Entanglement with Conditional Displacement Gates
• Qubit-oscillator concatenated codes: decoding formalism & code comparison
• Detecting continuous variable entanglement in phase space with the $Q$-distribution
• Protected cat states from kinetic driving of a boson gas
• Experimental Realization of Entangled Coherent States in Two-dimensional Harmonic Oscillators of a Trapped Ion
• Fast generation of Cat states in Kerr nonlinear resonators via optimal adiabatic control
• Dynamical gauge fields with bosonic codes
• Construction of a qudit using Schrodinger cat states and generation of hybrid entanglement between a discrete-variable qudit and a continuous-variable qudit
• Manipulating Fock states of a harmonic oscillator while preserving its linearity
• Experimental preparation of generalized cat states for itinerant microwave photons
• The coherent Ising machine with quantum feedback: the total and conditional master equation methods
• Generation of quantum entangled states of multiple groups of qubits distributed in multiple cavities
• Logical measurement-based quantum computation in circuit-QED
• Simple realization of a hybrid controlled-controlled-Z gate with photonic control qubits encoded via eigenstates of the photon-number parity operator
• Macroscopic delayed-choice and retrocausality: quantum eraser, Leggett-Garg and dimension witness tests with cat states
• Optimal quantum phase estimation with generalized multi-component Schrodinger cat states
• Lower bounds on the size of general Schrödinger-cat states from experimental data
• Concurrent Remote Entanglement with Quantum Error Correction
• Conversion of Thermal Equilibrium States into Superpositions of Macroscopically Distinct States
• Charge-Qubit-Resonator-Interface-Based Nonlinear Circuit QED
• Demonstrating efficient and robust bosonic state reconstruction via optimized excitation counting
• Certification of non-Gaussian Einstein-Podolsky-Rosen Steering
• High-Kinetic Inductance Additive Manufactured Superconducting Microwave Cavity
• Optical Schrödinger Cat States in One Mode and two Coupled-Modes Subject to Environments
• Dissipative phase transition in systems with two-photon drive and nonlinear dissipation near the critical point
• Collateral coupling between superconducting resonators: Fast and high fidelity generation of qudit-qudit entanglement
• Mesoscopic and macroscopic quantum correlations in photonic, atomic and optomechanical systems
• Decoherence effects in quantum nondemolition measurement induced entanglement between Bose-Einstein condensates
• Feedback control of persistent-current oscillation based on the atomic-clock technique
• Sculpting bosonic states with arithmetic subtractions
• Quantum nonlocality for entanglement of quasiclassical states
• Genuine Multipartite Entanglement induced by a Thermal Acoustic Reservoir
• EPR-entangled Bose-Einstein condensates in state-dependent potentials: a dynamical study
• Entropic distinguishability of quantum fields in phase space
• Growing Schrödinger's cat states by local unitary time evolution of product states
• Quantum-correlated photons generated by nonlocal electron transport
• Benchmarking maximum-likelihood state estimation with an entangled two-cavity state
• Generation of photonic tensor network states with Circuit QED
• Sequential nonabsorbing microwave single-photon detector
• Using the inductive-energy participation ratio to characterize a superconducting quantum chip
• Quantum simulation of a three-mode optomechanical system based on the Fredkin-type interaction
• Implementation of traveling odd Schr$\ddot{o}$dinger cat states in circuit-QED
• Area laws and thermalization from classical entropies in a Bose-Einstein condensate
• A macroscopic quantum three-box paradox: finding consistency with weak macroscopic realism
• Improved autonomous error correction using variable dissipation in small logical qubit architectures
• Weak versus deterministic macroscopic realism, and Einstein-Podolsky-Rosen's elements of reality
• Effect of Decoherence for Gate Operations on a Superconducting Bosonic Qubit
• Transmission losses in optical qubits for controlled teleportation
• Engineering continuous-variable entanglement in mechanical oscillators with optimal control
• Two-mode squeezing operator in circuit QED
• Topics in Quantum Networking
• Quantum entanglement in phase space
• Linear bosonic quantum channels defined by superpositions of maximally distinguishable Gaussian environments
• Optimizing for an arbitrary Schrödinger cat state
• Characterizing the Multipartite Entanglement Structure of Non-Gaussian Continuous-Variable States with a Single Evolution Operator
• Dispersive regime of multiphoton qubit-oscillator interactions
• A practical guide for building superconducting quantum devices
• Correspondence between maximally entangled states in discrete and Gaussian regimes
• Creation of superposition of arbitrary states encoded in two three-dimensional cavities
• Integrating planar circuits with superconducting 3D microwave cavities using tunable low-loss couplers
• Hybrid Rabi interaction with traveling states of light
• Anisotropic Rabi model with two-photon relaxation
• Two-Mode Bosonic State Tomography with Single-Shot Joint-Parity Measurement of a Trapped Ion
• Experimental demonstration of entanglement pumping with bosonic logical qubits
• Generation of bipartite mechanical cat state by performing projective Bell state measurement
• Swap-test interferometry with biased ancilla noise
• Liouville Fock state lattices and potential simulators
• ZX Graphical Calculus for Continuous-Variable Quantum Processes
• Precision measurements of the zero temperature dielectric constant and density of liquid ${}^4$He
• How many lives does Schrödinger's cat have?
• Double-Bracket Master Equations: Phase-Space Representation and Classical Limit
• Quantum Error Correction with Superpositions of Squeezed Fock States
• High-Fidelity Controlled-Phase Gate for Binomial Codes via Geometric Phase Engineering
• Energy cat states induced by a parity-breaking excited-state quantum phase transition
• Engineering nonlinear boson-boson interactions using mediating spin systems
• Evolution of entanglement under an Ising-like Hamiltonian with particle losses
• Characterization and generation of a SQL-beating catlike state through repetitive measurements
• A no-go result on observing quantum superpositions
• Quantum teleportation of cat states with binary-outcome measurements