Protecting the Quantum Interference of Cat States by Phase-Space Compression

Pan, Xiaozhou; Schwinger, Jonathan; Huang, Ni-Ni; Song, Peng; Weipin, Chua,; Hanamura, Fumiya; Joshi, Atharv; Valadares, Fernando; Filip, Radim; Gao, Yvonne Y.

doi:10.1103/physrevx.13.021004

Cited by 10 publications

(6 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Superconducting circuits are a promising platform for realizing this approach. Recent advancements have demonstrated the feasibility of coupling a transmon qubit to multiple cavity modes and achieving switchable dispersive and resonant interactions [25][26][27][28]. Our work not only facilitates the exploration of experimentally challenging nonlinear coupling regimes but also significantly enhances the capabilities of quantum simulation, opening up new capabilities for hybrid quantum information processing using qubits and oscillators and tests of new quantum nonlinear phenomena.…”

Section: Introductionmentioning

confidence: 84%

“…However, implementing this method needs further experimental development, including switching a single qubit between resonant and dispersive coupling with multiple cavity modes, a capability never tested in current superconducting circuit QED and ion trap systems limited to fixed interaction regimes. While advancements in achieving switchable qubit-oscillator couplings on platforms like superconducting circuits suggest that an experimental demonstration may be feasible with continued progress [12,19,25,26,28], more research is required to fully explore their capabilities and overcome limitations in current systems regarding fixed interaction regimes. Our analysis serves as an important step toward accessing intriguing dynamics for future quantum technologies.…”

Section: Discussionmentioning

confidence: 99%

“…Both trapped ion and superconducting circuits can dynamically switch between interaction types. In particular, superconducting circuits show promise for implementing tunable dispersive and resonant qubit-oscillator couplings [12,19,[25][26][27][28], whereas achieving dispersive coupling remains challenging in trapped ion systems [29]. In this regime beyond the rotating-wave approximation, theory suggests that we can achieve universal control of the oscillator using sequences of Rabi gates [23] and dispersive gates [30].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient quantum simulation of nonlinear interactions using SNAP and Rabi gates

Park,

Marek,

Filip

2024

Quantum Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Quantum simulations provide means to probe challenging problems within controllable quantumsystems. However, implementing or simulating deep-strong nonlinear couplings between bosonic os-cillators on physical platforms remains a challenge. We present a deterministic simulation techniquethat efficiently and accurately models nonlinear bosonic dynamics. This technique alternates be-tween tunable Rabi and SNAP gates, both of which are available on experimental platforms such astrapped ions and superconducting circuits. Our proposed simulation method facilitates high-fidelitymodeling of phenomena that emerge from higher-order bosonic interactions, with an exponentialreduction in resource usage compared to other techniques. We demonstrate the potential of ourtechnique by accurately reproducing key phenomena and other distinctive characteristics of idealnonlinear optomechanical systems. Our technique serves as a valuable tool for simulating complexquantum interactions, simultaneously paving the way for new capabilities in quantum computingthrough the use of hybrid qubit-oscillator systems.

show abstract

Section: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficient quantum simulation of nonlinear interactions using SNAP and Rabi gates

Park,

Marek,

Filip

2024

Quantum Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The experimental demonstrations of the GKP qubits to date, however, are in stationary systems that can be coupled to qubits ( 14 , 15 ) providing strong nonlinearity. Conversely, linear operations are not naturally available and have to be constructed by engineering the nonlinearity of the system ( 16 , 17 ), which limits the scalability to a large-scale multimode interaction. This is in contrast to the optical system, in which linear operations can be simply done with commercially available beamsplitters and multimode linear operations can be easily implemented ( 18 , 19 ).…”

mentioning

confidence: 99%

Logical states for fault-tolerant quantum computation with propagating light

Konno,

Asavanant,

Hanamura

et al. 2024

Science

Self Cite

View full text Add to dashboard Cite

To harness the potential of a quantum computer, quantum information must be protected against error by encoding it into a logical state that is suitable for quantum error correction. The Gottesman-Kitaev-Preskill (GKP) qubit is a promising candidate because the required multiqubit operations are readily available at optical frequency. To date, however, GKP qubits have been demonstrated only at mechanical and microwave frequencies. We realized a GKP state in propagating light at telecommunication wavelength and verified it through homodyne measurements without loss corrections. The generation is based on interference of cat states, followed by homodyne measurements. Our final states exhibit nonclassicality and non-Gaussianity, including the trident shape of faint instances of GKP states. Improvements toward brighter, multipeaked GKP qubits will be the basis for quantum computation with light.

show abstract

“…In strong dispersive coupling regime, a gate between a qubit and a cavity (qcMAP) which maps the qubit state onto a superposition of two quasiorthogonal coherent states with opposite phases [48,49] can be used for the generation of arbitrary superposition of coherent states while selective number-dependent arbitrary phase (SNAP) gate [50][51][52][53] enables the generation of Fock states. In weak dispersive coupling regime, which takes the advantage of low cavity self-Kerr, echo conditional displacement (ECD) gate [45,[54][55][56] and conditional not displacement (CNOD) gate [57] have realized fast universal control. In multicavity systems, a controlled-NOT (CNOT) gate utilizing a parametrically driven sideband interaction entangles two encoded multiphoton qubits [58] and further enables teleported control.…”

mentioning

confidence: 99%